The Binance hack involving more than $6 billion in virtual assets has been attributed to North Korea by the US Federal Bureau of Investigation (FBI), while the cryptocurrency exchange has begun preparing to restore withdrawals in phases and reported that approximately 95% of the affected amount has been covered. The incident, which Binance says occurred around October 29, 2026, has prompted security reviews, efforts to trace stolen assets, and cooperation between law enforcement and industry partners. The FBI refers to the North Korean activity associated with the theft as “TraderTraitor.” In its advisory, the agency said the stolen assets were being converted primarily into Ethereum (ETH), with further laundering through decentralized finance (DeFi) platforms and instant swap services expected. Binance said on November 1 that the first phase of withdrawal services was scheduled to resume between 06:00 and 09:00 UTC. The exchange said the restoration would depend on security assessments and operational readiness checks, with additional assets and networks becoming available as they pass the required checks.

Binance Hack: FBI Attributes $6 Billion Theft to North Korea

According to the FBI, North Korea was responsible for stealing more than $6 billion in virtual assets from Binance on or around October 29, 2026. The agency is working with the US Secret Service (USSS) and the Internal Revenue Service Criminal Investigation division (IRS-CI) to address the activity. The agencies have observed stolen crypto assets being converted primarily into Ethereum. The FBI expects the operators to use DeFi platforms and instant swap services to move the funds through additional laundering stages. The FBI, USSS, and IRS-CI have urged cryptocurrency industry participants to block transactions involving addresses used by the TraderTraitor actors, including transactions derived from those addresses. The request covers THORNode operators, remote procedure call (RPC) node operators, instant exchanges, DeFi services, blockchain analytics firms, and other virtual asset service providers. The FBI has also asked anyone with relevant information to contact a local FBI field office or submit information through the Internet Crime Complaint Center.

Binance Withdrawals to Resume in Phases

In its November 1 recovery update, Binance said it was preparing to restore withdrawals progressively after temporarily suspending the service as a precautionary measure. The exchange said the suspension allowed its teams to contain the impact of the incident, assess affected services, review withdrawal infrastructure, and monitor for residual risks. The company also said it was working with law enforcement and industry partners to trace and recover stolen funds. The first phase prioritizes assets and networks based on user demand over the preceding week. Binance said additional networks and assets would be added as they become ready, rather than reopening every withdrawal service simultaneously. Users may encounter temporary delays or longer processing times during the initial rollout because of traffic volumes. Binance advised users to check the withdrawal page for their selected asset and network, or consult its network status page, to confirm availability. The exchange said deposit services remained open and were not affected by the incident. It also stated that it would absorb the financial impact of the stolen funds rather than pass the losses on to users.

Binance Reports 95% Recovery of Affected Assets

Binance's recovery updates show a steady increase in the amount of affected assets it says has been covered. In its October 31 update, the company reported that coverage had reached approximately 90%, up from around 80% in the previous update. By November 1, Binance said it had covered approximately 95% of the impacted amount. The remaining 5% consists of tokens outside the ten assets it identified as fully backed, which include BTC, ETH, USDT, BNB, SOL, USDC, XRP, USD1, RLUSD, and ZEC. According to Binance, these remaining tokens have lower market liquidity and take longer to acquire at the required scale. The company said it was continuing to purchase the outstanding assets through market transactions and over-the-counter (OTC) channels. The exchange also said its replenishment efforts involved its corporate treasury, a partial deployment of the Secure Asset Fund for Users (SAFU), and a portion of its Futures insurance fund. Binance committed to replenishing SAFU to bring the fund back to approximately $1 billion.

The U.S. Justice Department and FBI have seized two hacking tools, Microscan and FishHub, that court documents say were operated and used by Flax Typhoon actors working for a China-based company. According to the government, the tools were used to scan, and in some cases hack, U.S. and foreign critical infrastructure systems and other networks. The court-authorized seizures were announced alongside court documents unsealed in the Western District of Pennsylvania. Prosecutors allege the actors worked for Integrity Technology Group (Integrity Tech), a company based in the People's Republic of China (PRC) that holds contracts with the PRC government. The action is the latest step by U.S. authorities against China state-sponsored hackers.

How Flax Typhoon Actors Used Microscan for Vulnerability Scanning

According to court documents, Integrity Tech built and used a botnet of internet-of-things devices infected with a variant of Mirai malware. The botnet supported the company's vulnerability scanning through Microscan, a tool Integrity Tech developed to perform reconnaissance on victim networks and identify weaknesses its clients would later exploit. Targets of Microscan scanning included a U.S. power company based in South Carolina, a multinational non-governmental organization, airports in Japan and Poland, Taiwanese critical infrastructure companies in the natural gas and power sectors, and two Taiwanese universities. Integrity Tech accessed Microscan through c0cc[.]cc, one of the seized domains.

FishHub and the Flax Typhoon Spear Phishing Operation

The second tool, FishHub, allegedly helped compromise computer networks through spear phishing. After gaining initial access, FishHub downloaded additional malware to the victim network. That malware either gave Integrity Tech's clients unauthorized remote access or searched for specific files and sent them to servers controlled by Integrity Tech. Confirmed FishHub victims included about 20 Taiwanese universities. Five seized domains helped deliver the malware: 98aicai[.]com, 98aicode[.]com, outlook3650[.]com, youtubecard[.]com, and linkedinns[.]net.

What Officials Said About Flax Typhoon

Assistant Attorney General for National Security John A. Eisenberg said the United States "will not allow China or its proxies to operate against United States interests with impunity in cyberspace." He added that the National Security Division would continue working to disrupt the Flax Typhoon threats and dismantle the infrastructure sustaining them. Assistant Director Brett Leatherman of the FBI's Cyber Division said, "The PRC relies on contractor and enabling companies to expand the reach and scale of its malicious cyber activity. By exposing and disrupting these enablers, we make it harder for the PRC to target American networks and infrastructure." U.S. Attorney Troy Rivetti for the Western District of Pennsylvania described the seizures as the second disruption of Integrity Tech's operations in as many years. Special Agent in Charge Mark Remily of the FBI San Diego Field Office said the action reflects the FBI's commitment to disrupting PRC state-sponsored cyber actors who threaten critical infrastructure and national security.

Second Disruption of Flax Typhoon Infrastructure

This is the Justice Department's second public technical disruption of Integrity Tech's hacking infrastructure. In September 2024, the department announced the court-authorized disruption of Integrity Tech's Mirai botnet, which included more than 200,000 consumer devices in the United States and worldwide. Alongside the latest seizures, the FBI and other U.S. and foreign partner agencies published a cybersecurity advisory listing indicators of compromise tied to Integrity Tech intrusion activity. The advisory is intended to help network defenders identify and respond to the group's malicious activity. The FBI San Diego and Baltimore Field Offices are investigating the case in coordination with the FBI's Cyber Division. Assistant U.S. Attorney Brendan McKenna for the Western District of Pennsylvania and Trial Attorney Jacques Singer-Emery of the National Security Division's National Security Cyber Section are prosecuting the case. Assistant U.S. Attorney Thomas Sullivan for the District of Maryland and the National Police Agency of Japan provided substantial assistance.

The FBI and the U.S. Secret Service (USSS) have issued a joint cybersecurity advisory warning organizations about FortiBleed, an active global credential-compromise campaign targeting internet-facing Fortinet FortiGate firewalls and SSL VPN gateways. The advisory, published on October 6, 2026, cites SOCRadar data verifying more than 86,644 compromised devices across 194 countries.

According to the advisory, the campaign exploits reused or leaked credentials and legacy SHA-256 password storage, allowing threat actors to harvest and crack authentication data at scale. Attackers continue to scan exposed Fortinet firewalls using previously obtained credentials, and some affected organizations have been locked out of their own systems.

How the FortiBleed Attack Chain Works

The operation's internal workflow came to light after the threat actors unintentionally exposed their own backend server. The open directory revealed a mature, multi-stage campaign run as an initial access broker operation.

Attackers first scanned the internet for exposed FortiGate SSL VPN portals using automated scripts. They then gathered credentials through credential stuffing and password spraying, drawing on prior Fortinet leak dumps and infostealer logs.

Password hashes taken from compromised devices were exfiltrated and fed into a GPU-accelerated cracking cluster running on rented infrastructure, where Hashcat and Hashtopolis ran distributed jobs to convert stolen data into plaintext credentials.

[caption id="attachment_114628" align="aligncenter" width="800"] Source: FBI[/caption]

Cracked credentials were then validated, with scripts filtering out honeypots, mapping organizations and ranking high-value targets by revenue and network structure. Attackers created new administrative accounts on firewalls to maintain persistence, then moved into victim networks to enumerate Active Directory and identify privileged accounts. The final stage involved selling access, including working VPN configurations and target lists, to downstream threat actors.

FortiBleed Lockouts and Ransomware Links

The advisory warns that victims may lose access to their Fortinet devices if attackers delete original accounts or change their passwords. In certain cases, threat actors removed existing accounts to block organizations from their devices while attempting lateral movement. Recovery may require steps beyond standard patching and password resets.

Reporting also indicates that initial access brokers using the FortiBleed attack chain have supplied access to ransomware affiliates, currently including INC/Lynx ransomware and Payload ransomware.

FortiBleed Indicators of Compromise

The agencies released indicators of compromise (IOCs) to help defenders review their environments. IP address 45.154.12.132 was observed as a command and control server, while 154.202.59.169 and 103.27.186.156 served as proxy nodes and 45.155.250.158 functioned as a beacon relay. The address 85.11.187.8 was linked to the Hashtopolis tool. The advisory also lists 13 IP addresses observed between June 18 and July 23, 2026, conducting brute force attacks or authenticating with compromised accounts.

Account names found on victim systems include adminin, fortiAdmin, forticloud-sync, fgtsecure, adminsslvpn, itadmin and roadmin. The agencies note that IP addresses may be reassigned over time and advise organizations to vet IOCs before acting on them.

Recommended Mitigations Against FortiBleed

The FBI and USSS recommend that organizations:

• Restrict external management through trusted hosts, a local-in policy, or by removing internet administration entirely.
• Terminate all active admin and VPN sessions and reset all Fortinet VPN and administrative passwords.
• Enforce phishing-resistant MFA on all remote access and administrative accounts.
• Review firewall and VPN configurations for unrecognized accounts and unauthorized changes.
• Check firewall, VPN, authentication and domain controller logs for unusual access.
• Use PBKDF2 to store administrator credentials and remove weaker legacy hashes, following Fortinet guidance for FortiOS v7.2.11 and later.
• Review all REST API keys, remove unknown ones and refresh legitimate keys.

Organizations that detect a compromise are urged to isolate affected hosts, scope the intrusion and report incidents to the FBI's Internet Crime Complaint Center (IC3), a local FBI field office or a local USSS field office.

This weekly roundup covers a brazen breach claim against the FBI's recruitment portal, a multinational advisory exposing North Korea's fake-recruiter malware operation, a sweeping EU proposal to reshape children's access to social media, a conversation on application security in the age of AI agents, a short-lived Discord ban in the Philippines, and a multimillion-dollar hot-wallet heist at a crypto casino.  From federal law enforcement to individual job seekers, this week's developments show that no target is too prominent or too small. Cybercriminals are openly taunting the agencies that pursue them, state-backed actors are turning the hiring process into an attack vector, and governments are testing how far they can push platforms on child safety, sometimes reversing course within hours. 

The Cyber Express Weekly Roundup 

Shiny Hunters Claims FBI Breach, Says FBIjobs Agent Data Exposed 

The FBI is investigating an apparent breach after the cybercriminal group Shiny Hunters claimed to have stolen personal data belonging to thousands of federal agents, with the probe centering on the bureau's FBIjobs recruitment website. Read more... 

WaterPlum Hackers Steal $10.7M in Crypto From IT Workers 

A North Korean cyber actor group known as WaterPlum, also referred to as "Contagious Interview," has infected at least 30,000 devices across more than 100 countries while stealing cryptocurrency from IT professionals worldwide. Read more... 

EU KIDS Act Sets New Social Media Rules for Children 

The European Commission adopted the proposal on September 18, setting out rules that would prevent children under 13 from accessing social media and establish 15 as the minimum age for minors to open accounts independently. Users aged 13 to under 15 could instead access parent-managed mini accounts with limits on social contacts and up to 60 minutes of screen time per day, while platforms would bear the responsibility of proving their services are safe for children. Read more… 

Harness' Rahul Sood: AppSec in the Agentic Era Is About More Than Code. It's About Authority 

In this conversation, The Cyber Express spoke with Rahul Sood, the General Manager for Application Security at Harness, who leads the company's AppSec portfolio and focuses on building security for the AI era, integrated directly into modern DevOps workflows. The conversation centers on a shift in how security teams must think about AI agents: the risk no longer lies only in the code being shipped, but in what authority autonomous agents are granted once they operate inside production systems. Read more… 

Ban on Discord Lifted After Platform Commits to Work With DICT and CICC 

The Philippine government has lifted its ban on Discord after the platform's representatives met with officials from the Department of Information and Communications Technology (DICT) and the Cybercrime Investigation and Coordinating Center (CICC), with the restriction removed on Thursday, Sept. 24. Read more... 

Duelbits Hit by $7 Million Hack as Crypto Stolen Across Four Blockchains 

Crypto casino Duelbits has shut down its platform after attackers took roughly $7 million from several of its wallets, with the stolen assets moved across four blockchains and mostly converted into Ether. The company says funds held in user accounts have not been affected, but it has not explained how the attackers got in or when the site will return. Read more... 

Weekly Cybersecurity Takeaway 

This week's developments span the full spectrum of cyber risk, from a criminal group openly retaliating against the FBI over a public advisory, to a state-backed operation weaponizing job interviews against developers, to a crypto platform losing millions from the very hot wallets that keep it running.  Meanwhile, the policy response is moving on multiple fronts: the EU is flipping the burden of proof onto platforms to demonstrate child safety by design, and the Philippines has shown how quickly a government can block, and then restore, a major platform in exchange for enforcement commitments. At the same time, security leaders are warning that AI agents are introducing an entirely new question of who, or what, holds authority inside enterprise systems.  Taken together, the stories point to an increasingly confrontational threat landscape, where attackers are bolder, trust-based processes like hiring are being exploited at scale, and institutions are experimenting with more aggressive levers to hold platforms and adversaries accountable. 

The U.S. State Department has posted a $10 million reward for Amir Yaryab, a senior Iranian official accused of leading the Islamic Revolutionary Guard Corps Cyber-Electronic Command (IRGC-CEC) Cyber Operations Command and directing multiple hacking groups targeting critical infrastructure across the United States, Europe and the Middle East. According to the Rewards for Justice program, Yaryab allegedly oversees cyber operations conducted by IRGC-CEC-affiliated groups including CyberAv3ngers, Dadeh Afzar Arman (DAA) and Mehrsam Andisheh Saz Nik (MASN). U.S. officials accuse these groups of using malware and conducting cyber and cyber-enabled information operations against civilian infrastructure worldwide.

$10 Million Reward for Amir Yaryab

The $10 million reward for Amir Yaryab seeks information leading to his identification or location. The offer applies to individuals acting at the direction or under the control of a foreign government who participate in malicious cyber activities against U.S. critical infrastructure in violation of the Computer Fraud and Abuse Act. [caption id="attachment_113961" align="aligncenter" width="600"] Image Source: https://rewardsforjustice.net/[/caption] Yaryab is also accused of directing Shahid Hemmat and Shahid Shushtari, two groups linked to cyberattacks against U.S. organizations. The sectors allegedly targeted include defense, news, shipping, travel, energy, financial services and telecommunications. The six Iranian officials named in the advisory are linked to Iran's Islamic Revolutionary Guard Corps and its Cyber-Electronic Command.

Iranian Cyberattacks Target PLCs

The allegations also involve attacks against programmable logic controllers (PLCs), highlighting concerns around Iranian cyberattacks targeting industrial systems rather than focusing only on data theft. U.S. officials said Iranian-linked hackers compromised industrial control systems, specifically targeting the Vision series of PLCs manufactured by Israel-based Unitronics. These devices are used across water and wastewater, energy, food and beverage, manufacturing and healthcare sectors. The attackers exploited default credentials on the devices and left anti-Israel messages. Some of the compromises reportedly rendered the PLCs inoperative. The CyberAv3ngers group, which is linked to the IRGC-CEC, claimed responsibility for attacks against Unitronics Vision PLCs in October 2023. Beginning in November 2023, the group compromised default credentials in PLCs across the United States and left messages on the devices' digital screens.

CyberAv3ngers Attacks Critical Infrastructure

CyberAv3ngers has also claimed responsibility for attacks affecting other infrastructure. In October 2023, the group claimed it had breached ORPAK Systems, a provider of gas station solutions in Israel. The group said it had obtained the company's database and intended to publish it through its Telegram channel. The attack was reported to have disconnected 200 gasoline pumps from the system in the occupied Palestinian territories. In December 2023, CyberAv3ngers also claimed to possess and sell 1TB of data allegedly linked to Israel's electricity infrastructure. The group advertised the dataset for 5 Bitcoin, with an initial 100GB portion also offered at the same price.

U.S. Agencies Warn of PLC Cyberattacks

Concerns over critical infrastructure attacks involving PLCs continued into 2026. A joint advisory issued on April 7 by the FBI, CISA, NSA and other agencies warned that Iran-linked threat actors were actively exploiting internet-facing PLCs. The advisory said several organizations had experienced operational disruptions and financial losses after attackers interfered with industrial processes. The developments come amid broader U.S. actions against Iranian-linked cyber activity. The Justice Department accused Iran-connected hackers of breaching employee email accounts associated with the Department of Labor, the Federal Energy Regulatory Commission and multiple United Nations organizations. The Treasury Department also sanctioned Iranian nationals over cyberattacks targeting critical infrastructure. The State Department's reward offer places Amir Yaryab and the alleged activities of IRGC-CEC-linked groups at the center of the U.S. effort to identify individuals responsible for malicious cyber activity targeting critical infrastructure.

The CISA and FBI, along with cybersecurity agencies from Australia, Canada, New Zealand and the U.K., have released new guidance on outage communications for service providers dealing with major IT and OT outages. The guide calls for prompt, factual and audience-specific communication during disruptions caused by malicious cyber activity or non-malicious events.

Titled “Communicating Under Pressure: Best Practices for Service Providers,” the guidance says effective communication is critical to limiting operational impact when IT and OT outages affect customers, network defenders, critical infrastructure owners and operators, and the public. It recommends that organizations clearly communicate what is known, what remains unknown and what is still under investigation, while providing frequent updates as circumstances change.

Outage Communications Should Start With Facts

The agencies recommend that service providers establish an outage communications plan before an incident occurs. The plan should define incident thresholds, escalation paths, target audiences and procedures for status pages, customer and partner notices, and regulatory communications. Organizations are also advised to establish cross-functional incident teams involving engineering and operations, communications, legal, risk and compliance, and customer support.

The guidance calls for clearly defined roles, including an incident lead, communications lead and spokesperson. It also recommends parallel workstreams so technical teams can focus on diagnosing and remediating the root cause while communications teams manage external messaging and leadership handles strategy and regulatory requirements.

For organizations responding to cyber incidents, the guidance places particular emphasis on balancing transparency with operational security. If malicious activity is suspected or confirmed, external communications should not compromise investigations, containment efforts or other response activities. Organizations are also advised against making premature conclusions when the root cause remains under investigation.

Service Providers Urged to Tailor Messages

The guidance recommends segmenting communications for technical teams, executives and the public. Audiences can include enterprise IT teams and security operations centers, employees and customers, government partners and regulators, critical infrastructure owners and operators, as well as the media and general public.

During an outage, organizations should lead with a concise summary covering affected systems, user impact, scope and the known cause without speculation. The agencies also advise against vague descriptions such as “service degradation” and recommend messaging that can be understood quickly during high-pressure situations.

Transparency is another central principle. Service providers are advised to state what they know and do not know, use a single source of truth such as a status page, and focus communications on actionable guidance rather than reputation management. Customers should be told what actions they need to take or clearly informed when no action is required.

The guidance also calls for continuous, time-stamped updates that show the incident timeline, actions taken, and recovery milestones. Organizations should maintain a single status page and align external messaging with legal, contractual and sector-specific reporting obligations.

Agencies ultimately frame effective outage communications around five principles: immediate acknowledgement, technical and actionable information, transparency, accountability, and continuous updates. For service providers, the guidance positions communication as an important part of incident response, alongside technical remediation and recovery.

The FBI is warning the public about sexual exploitation actors illegally accessing social media and personal accounts to steal explicit images and videos from adult and underage victims. The stolen material, also known as non-consensual intimate images (NCII), is being posted or sold on criminal marketplaces, often without the victim's knowledge.

According to the FBI, these actors use social engineering and cyber intrusion tactics to target specific individuals or general targets of opportunity. After gaining access to accounts, they steal explicit content and share it through community forums or illicit marketplaces.

The FBI said personally identifiable information, including a victim's name, date of birth, email address, phone number and social media username, is often posted alongside the stolen material. This can expose victims to continued harassment and re-victimization.

How Sexual Exploitation Actors Access Accounts

The FBI has identified several methods used by sexual exploitation actors to gain access to victims' accounts.

Password and PIN Targeting

In password/PIN targeting, actors use high-volume password and PIN attempts against social media and personal accounts. The information used in these attempts can come from data leak sites, social media and open-source information.

When victims are known to the actors, curated lists may include personal details such as names, date of birth or variations of those details.

Social Media Customer Service Impersonation

Another tactic involves social media customer service impersonation through text messages. Victims may receive messages claiming their account is being disabled or locked unless they provide a verification code.

The actor then requests a password reset, causing a code to be sent to the victim. If the victim shares the code, the actor can reset the password and access the account.

Phishing Emails

The FBI also warns about phishing campaigns using look-alike domains and email accounts designed to appear as social media customer support.

These messages may claim there has been a new login and contain an embedded link asking the victim to change their password. Clicking the malicious link can give the actor access to the account.

Stolen Content Can Lead to Further Attacks

Once explicit content is stolen, sexual exploitation actors may post or sell it while including personal information about the victim. The FBI said victims can subsequently face harassment, sextortion, stalking or other targeted attacks.

The actors may also advertise stolen content through a victim's own social media page, increasing the potential for further exposure.

FBI Shares Steps to Protect Accounts

The FBI advises people to avoid storing sensitive images or videos on social media platforms or other internet-accessible sites.

It recommends using unique, complex passphrases and PINs along with multi-factor authentication (MFA). Password information directly associated with a person's identity, including names or birthdays, should be avoided.

Users should also be cautious with links received through emails and text messages. The FBI recommends going directly to the relevant website to address account concerns and checking URLs before clicking.

Unrequested temporary passwords, PIN resets or access codes should also be treated with caution. The FBI advises users not to share login information, even when someone claims to represent a platform or service.

People who believe their explicit content was stolen or leaked can provide information through the FBI's NCII reporting site. The FBI also advises the public to continue reporting fraud, scams and cyber threats to the Internet Crime Complaint Center or a local FBI Field Office.

Gunra ransomware has expanded its operations through a structured ransomware-as-a-service (RaaS) affiliate program, prompting the FBI, CISA and other agencies to issue a joint advisory warning organizations about the threat. The Gunra ransomware variant uses a double-extortion model, encrypting victim data while threatening to publish stolen information on a dedicated leak site if ransom demands are not met. The FBI first observed Gunra in April 2025 as a double-extortion ransomware variant derived from leaked Conti ransomware source code.

Gunra Ransomware Shifts to Affiliate Model

By early 2026, the group had expanded through a formal ransomware-as-a-service affiliate program advertised on dark web forums. The program provides affiliates with a management panel, configurable ransomware builder, cross-platform locker payloads and affiliate documentation. The FBI also observed Gunra operating under new branding aliases, including Golden Community, while recruiting penetration testers and ethical hackers as initial access brokers. Gunra initially focused on Windows environments before introducing a Linux variant and moving toward broader cross-platform targeting. Victims observed on the group’s dedicated leak site include organizations across the Americas, Europe, the Middle East, Africa and the Asia-Pacific. Targeted sectors include healthcare and public health, financial services and insurance, critical manufacturing, transportation, government services, utilities, academia, media and communications, retail, and professional and nonprofit services.

VPN Vulnerabilities Used for Initial Access

According to the advisory, Gunra actors primarily gained initial access by exploiting known vulnerabilities in internet-facing devices, including firewall and VPN gateways. The FBI observed exploitation of CVE-2024-55591 and CVE-2025-24472, authentication bypass vulnerabilities affecting specific FortiOS and FortiProxy versions. The Republic of Korea’s National Police Agency also observed Gunra actors exploiting credential exposure and SSH access control weaknesses in internet-facing VPN gateways to obtain unauthorized remote access. After gaining access, attackers used tools including Impacket utilities to move laterally through victim networks using SMB. In one case, actors compromised an SSL-VPN appliance using default credentials where account lockout controls were absent. They later used stolen session information to access internal virtual desktop infrastructure and move through systems including Active Directory servers and IT personnel workstations.

Data Theft Precedes Encryption

The double-extortion ransomware operation involves stealing sensitive information before encrypting systems. The FBI observed Gunra actors collecting business-critical documents, databases, personally identifiable information, and internal email communications. In at least one case, the actors used a malicious executable called main.exe to exfiltrate data from Microsoft OneDrive and SharePoint. Compressed archives containing sensitive information were also transferred to the Mega file-sharing service, with the volume of exfiltrated data reaching tens of terabytes. For encryption, Gunra uses ChaCha20 and RSA-4096 algorithms and has been observed using the .ENCRT extension for encrypted files. A documented sample from July 2025 used the .CRYPT extension. The ransomware also uses Windows Management Instrumentation to delete volume shadow copies before encryption, while one victim had backup and archived data deleted from both primary and disaster recovery infrastructure.

Agencies Urge Patching and Network Segmentation

The authoring agencies recommend that organizations prioritize patching known exploited vulnerabilities in internet-facing systems, including VPN gateways and RDP-exposed infrastructure. They also advise implementing and testing offline, immutable backups stored in physically separate and segmented locations. Network segmentation is another key recommendation, intended to restrict lateral movement and limit the spread of ransomware between systems. The agencies also recommend reviewing domain controllers, servers, workstations and Active Directory environments for unrecognized accounts, auditing administrative privileges, requiring MFA where possible and testing security controls against the Gunra techniques mapped to the MITRE ATT&CK framework. The joint advisory was published August 10, 2026, as part of the ongoing #StopRansomware initiative.