Bring your own vulnerable driver (BYOVD) is having a moment in endpoint security. Some of the buzz is earned. Some of it is overblown. This series unpacks both and shows the evidence for each. This piece traces how the technique scaled into an industry.

Ransomware actors successfully disabled security tools in about 48% of intrusions in 2024. That figure comes from security researchers, drawn from incident-response engagements across the year. Attackers attempted to blind the defender in most of those cases. They almost always succeeded. Turning off the sensor was once a flourish. It is now a default move.

That 48% is the broad rate for disabling security tools by any method. BYOVD is the kernel-level technique this series tracks, one fast-growing method inside that number, and public threat research treats it as the part of the tamper problem accelerating fastest. Treat the 48% as the ceiling and the BYOVD slice as the piece that scaled into a market.

The Claim: This Became a Supply Chain

EDR killing industrialized over the last several years. SentinelOne®'s latest Annual Threat Report, "Defending Against the Industrialization of the Modern Cyber Breach," names that shift directly, with mature automation accelerating intrusions and tradecraft moving from one-off effort to maintained capability. A killer was once a binary an intruder wrote and discarded. Today it is a serviced capability, built, versioned, and bundled into ransomware-as-a-service for affiliates who never touch a debugger. The defender once faced a hobbyist. Now the defender faces a development pipeline.

A pipeline behaves differently from a one-off binary. It ships versions, fixes bugs, and reuses code across releases. The defender reads that cadence like a vendor roadmap, and every release leaves the same observable footprint when it runs. The reuse is visible in the architecture. Public threat reporting describes one current framework spinning eight-plus variants off a single shared design. That also means a detection tuned to one variant often catches its siblings. Code reuse cuts both ways, and the defender holds one of the edges.

The Proof: A Four-Year Timeline

Start at the floor. Public threat research documented an early Process Explorer-driver killer in 2023, used to disable EDR ahead of Medusa Locker and LockBit. The same year, SentinelLABS tracked an actor called "Spyboy" selling the Terminator killer. The price ran from $300 for a single AV bypass to $3,000 for the all-in-one EDR killer, and the tool abused Zemana drivers. These were early-window artifacts. They were standalone, sold, and disposable.

That timeline has a SentinelLABS anchor that reframes the whole story. SentinelLABS attributed the AvNeutralizer killer, also known as AuKill, to the FIN7 cybercrime group. FIN7 sold it on Russian-language forums at prices running from $4,000 to $15,000. The tool abused a Time Travel Debugging driver and the Process Explorer driver to disable defenses. This is the moment a killer stopped being a one-off and became a product with a price list.

The adoption pattern proves the product framing. SentinelLABS tracked AvNeutralizer spreading into Black Basta, AvosLocker, MedusaLocker, BlackCat, Trigona, and LockBit operations. One group built it, and six competing crews ran it. A single tool crossing that many rivals is the signature of a supplier, and the new feature was distribution.

Then the model changed inside ransomware-as-a-service. In August 2024, public reporting disclosed EDRKillShifter, abusing the RentDrv2 and ThreatFireMonitor drivers and first seen in a RansomHub attack. Researchers assessed with moderate confidence that the tool served multiple attackers, not RansomHub alone. The SentinelOne RansomHub anthology records the affiliate logic behind that spread, a customized EDR-killer tool made available to higher-level affiliates. One crew's tool became many crews' tool, and the new feature was tiered access.

The driver roster widened fast across 2025. In early 2025, public threat research documented a malicious driver that carried stolen, revoked certificates and imitated a legitimate EDR driver to silence defenses inside Medusa intrusions. By August 2025, GuidePoint tracked Akira affiliates in SonicWall VPN intrusions chaining a ThrottleStop driver, rwdrv.sys, with a malicious helper, hlpdrv.sys, to disable the built-in Windows antivirus. Different crews, different drivers, the same kernel-level objective. SentinelOne's latest Annual Threat Report records the same pattern from the other side of the kill, naming crews that script the built-in Windows antivirus into silence and kernel-mode drivers derived from POORTRY used to terminate EDR processes and delete security files.

The CVE-anchored cases arrived next. In December 2025, security researchers documented DeadLock ransomware abusing the Baidu antivirus driver BdApiUtil, tracked as CVE-2024-51324, to terminate EDR and the built-in Windows antivirus. In February 2026, public reporting documented Reynolds ransomware embedding the vulnerable NSecsoft driver NSecKrnl, tracked as CVE-2025-68947, which terminated more than 30 security processes. Those CVE records do not name the ransomware, and the actor mapping comes from threat intel. The same NSecKrnl driver shows up across unrelated crews, tied to Reynolds and to Warlock. A driver is shared infrastructure, so pivoting on the driver hash groups campaigns by supplier, not by gang.

By 2025 the sharing went structural. Threat-intel reporting found one EDR killer used across several competing ransomware families, distributed as distinct per-attack packed builds, and Singapore's national cyber agency corroborated the same multi-group pattern in an August 2025 advisory, independent of any single vendor. Public threat research also catalogued a forming marketplace of named killers priced from hundreds to thousands of dollars. Rivals were now buying from a common counter.

The 2026 picture is operator-run kits with large affiliate cuts. Public threat reporting documented the Gentlemen RaaS shipping its in-house EDR killer framework, running eight-plus BYOVD variants and targeting over 400 processes across 48 security products through DeviceIoControl calls. The operator reportedly hands affiliates around a 90% revenue share, a 10% operator cut against a 20% industry standard, and bundles third-party killers like HexKiller and ThrottleBlood. By April 2026, researchers saw Qilin and Warlock at the same game, Qilin chaining the rwdrv.sys and hlpdrv.sys pair while Warlock ran NSecKrnl. Public threat research now reads EDR killers as a standard, repeatable phase of the attack playbook. SentinelOne's latest Annual Threat Report measured how far the response window has collapsed, with one chained sequence reaching SYSTEM in roughly 30 milliseconds and a separate intrusion moving from initial download to a persistent service in 49 seconds.

The Turn: Acceleration Over Origination

Here is the correction the timeline forces. Commercial sale of EDR killers predates the 2024 window. SentinelLABS had Terminator on the market in 2023 and dated FIN7's AvNeutralizer sales earlier still. ExtraHop tracked a dark-web market for these tools across 2024 and 2025. Older still, the open-source EDRSandblast project weaponized a vulnerable driver against more than 1,000 security drivers back in 2022. The raw capability was for sale before the surge.

So the real story is acceleration and consolidation. The non-obvious shift is that rival ransomware crews stopped competing on this layer and started sharing it instead. Several groups feeding from one killer is a market choosing a common supplier. The cost of building beats the cost of buying.

The economics pulled the skill floor down. Reynolds ransomware bundled a vulnerable driver as a recruiting selling point aimed at less-skilled operators, and a capability that once required a kernel developer now requires a subscription. The driver is the part most likely to fail in unskilled hands, so researchers documented a practice they call driver decoupling. Affiliates install the vulnerable driver and confirm it loads before running the killer. That is the kind of guardrail a supplier adds to keep low-skill customers successful, packaging doing the work the operator used to do by hand.

What Makes Consolidation Possible

Markets need shared infrastructure, and this one has it. The shared killer that reporting tracked was one tool reissued as distinct packed builds for each attack, with the packer as the common chokepoint several rivals fed through. Singapore's advisory described the same customized-build distribution model, a single supplier serving many buyers.

The driver supply explains why it scales. Public reference lists now track thousands of vulnerable signed drivers, most reachable without admin rights. The live LOLDrivers catalogue alone records hundreds of unique drivers, a large share still missing from the default driver blocklist. That inventory reads as a parts catalog for the kit builder, a dual-use commodity supply where weak driver access controls hand unprivileged users a way in.

The price ladder runs from the low hundreds for Terminator to five figures for FIN7's AvNeutralizer, both tracked by SentinelLABS, while EDRKillShifter spread through tiered affiliate access rather than a flat price. The skill floor drops in step. EDRSandblast showed the open-source baseline back in 2022, already capable against more than 1,000 security drivers, and a buyer in 2026 does not need that depth. The operator maintains the tool and the affiliate just runs it, so each layer of packaging removes a reason an attacker would have failed. A working tool spreads fast once the price of entry drops to a download.

The Payoff: A Top-Tier Threat Getting Cheaper

Put the pieces together and the threat ranking is clear. Disabling defense is attempted in most ransomware intrusions and succeeds in roughly half. The tooling that does it is now maintained, shared across rivals, and sold with affiliate economics that reward volume. Each force lowers cost and widens reach at once. This is a structural threat, and it is getting cheaper to run.

Defenders set the response, and the response is not despair. Public threat research shows BYOVD remains the dominant kill method, and that dominance means the kill chain stays observable. The killer still has to act in a fixed sequence. It installs a driver, registers a kernel service, and issues the calls that terminate the sensor. Those steps leave telemetry behind them.

The defender should still hold the technique apart from its cousins. BYOVD is one entry in a tamper taxonomy. A driverless class is smaller but growing, and it skips the driver-install step entirely. EDR-Freeze suspends the sensor through a Windows error-reporting race, staying fully in user mode. EDRSilencer uses Windows filtering rules to block the sensor's telemetry from leaving the host. Those two break the driver-load observable, so a detection built only around driver loads will miss them.

Prevention narrows the window without closing it, which is exactly why behavioral observables carry weight. The sequence is concrete enough to map to event IDs. Picus Security described the early steps of the BYOVD chain as logged events. A service created with sc.exe surfaces as a Sysmon process-create record (Event ID 1) and a System service-install event (Event ID 7045). The driver load surfaces as a Sysmon driver-load record (Event ID 6). The killer then issues its DeviceIoControl call, followed by callback removal and security-process termination. Each arrow in that chain is a place to correlate and alert.

The behavior inside that chain is even more specific. Public threat research documented a kill loop where a masquerading kernel service enumerates running processes on a repeating, fixed-interval cycle. It passes the process IDs through an IOCTL so the driver calls the kernel termination routine directly, bypassing the protected-process protections that guard the sensor. The repeating rekill cadence is itself a signal, because a normal service does not poll the process list and terminate from kernel mode on a loop.

Callback removal deserves its own hunt, separate from the kill. SOC Prime documented Qilin loading rwdrv.sys for raw memory read and write, then loading hlpdrv.sys to remove the EDR's registered kernel callbacks across more than 300 products. Stripping callbacks blinds the sensor without terminating its process. The process still runs and still reports healthy. The defender who only watches for a killed process misses this entirely.

The masquerade is its own tell. Frameworks ship variants that each impersonate a legitimate product to blend into a normal driver inventory, and one documented driver carried stolen, revoked certificates to imitate a real EDR driver. The defender's answer is to treat the signer and the first-seen status as data. Splunk detection content keys on any driver load whose signature status is not Valid. Alert on a driver whose hash, signer, or version has never appeared on the host before.

The witnesses also outlast the endpoint. Once the sensor is silenced, network, identity, and cloud telemetry are what remain, and independent analysis found EDR-killer execution preceding ransomware across multiple gangs, a window enough to intervene before encryption. Singapore's national cyber agency framed EDR-killer activity as huntable through driver-load monitoring, termination patterns, and telemetry cessation. An agent's health drop, a lost heartbeat, or a gap in a constant feed all read as tamper, so alert on the absence of expected signal. A high-fidelity variant is System Event ID 7031, the service-crash log Windows writes when a kill abruptly terminates a security service. It is rare in a healthy environment, which makes it a strong candidate for a tight, low-false-positive alert.

The mental shift for the practitioner is this. Stop modeling the EDR killer as an exotic, once-a-year event and start modeling it as supply. A supplied capability has a pipeline, a release cadence, and paying customers, and every one of those is a place to detect, disrupt, and raise cost. SentinelOne builds for that fight. SentinelLABS co-discovered the POORTRY and STONESTOP signed-driver toolkit and drove the security advisory ADV220005 that followed. SentinelOne then shipped Local Upgrade Authorization on by default for new customers to blunt the tamper bypass. The purpose behind that work is to give the advantage to those who secure our future. The industry built a market for killing your sensor. The defender's job is to make that market expensive.

Why This Is The Work SentinelOne Exists To Do

Read the timeline and the conclusion is plain. You do not out-hustle a development pipeline with manual triage. You answer it with a pipeline of your own. SentinelOne built the Singularity™ Platform on Autonomous Security Intelligence (ASI) for this exact asymmetry, so the response runs at the speed the supply chain ships. Purple AI® is the reasoning interface for that platform, and its Agentic Investigation capability launches the moment a threat crosses the line, detecting, investigating, verifying, and responding without waiting for an analyst to wake up. The capability does not displace the human. Wayfinder, SentinelOne's 24/7 managed detection and response practice, puts seasoned threat hunters on top of that autonomous layer, with managed response and an incident-readiness retainer when the worst happens. The killer industrialized. The defense industrialized with it.

Next in this series: the trust gap underneath every one of these drivers, and why a certificate revoked sixteen years ago still loads code into the Windows kernel today.

External References

1. "EDR killers are now a thing, and ransomware crews love them," The Register, 14 August 2025.
2. "RansomHub gang deploys new tool to kill EDR software," Security Affairs, August 2024.
3. "GRIT Report: Akira and SonicWall," GuidePoint Security, 5 August 2025.
4. "Event ID 7031: Service crash," ManageEngine EventLog knowledge base.
5. "CVE-2024-51324," National Vulnerability Database.
6. "Reynolds ransomware uses BYOVD to disable security before encryption," Security Affairs.
7. "CVE-2025-68947," National Vulnerability Database.
8. "Advisory AD-2025-018," Cyber Security Agency of Singapore, 16 August 2025.
9. "The Gentlemen RaaS uses GentleKiller," The Hacker News, June 2026.
10. "Inside GentleKiller: the EDR killer powering the Gentlemen," Security Affairs.
11. "Gentlemen Ransomware Gang Standardizes EDR Killing," BankInfoSecurity.
12. "The Dark Web Market for EDR Killers," ExtraHop, 2024.
13. "EDRSandblast," Wavestone CDT, GitHub.
14. "EDRSilencer," netero1010, GitHub.
15. "EDRSilencer red team tool used in attacks to bypass security," BleepingComputer, 15 October 2024.
16. "New EDR-Freeze tool uses Windows WER to suspend security software," BleepingComputer, 22 September 2025.
17. "What Are Bring Your Own Vulnerable Driver (BYOVD) Attacks," Picus Security, 2026.
18. "Qilin EDR killer infection chain," SOC Prime, 7 April 2026.
19. "Windows Drivers Loaded by Signature," Splunk research.
20. "Windows Vulnerable Driver Loaded," Splunk research.
21. "loldrivers.io," live vulnerable-driver reference list, accessed 26 June 2026.

IP Disclaimer:

This blog may include discussion of unreleased services or features. Any unreleased services or features referenced here are still in development and subject to change. Customers should make their purchase decisions based upon features that are currently available.

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The post Flash Alert: From Bing Search to Ransomware: Bumblebee and AdaptixC2 Deliver Akira appeared first on The DFIR Report.

The scourge of ransomware continues primarily because of three main reasons: Ransomware-as-a-Service (RaaS), cryptocurrency, and safe havens.

• RaaS platforms enable aspiring cybercriminals to join a gang and begin launching attacks with a support system that help extract ransom payments from their victims.
• Cryptocurrency enables cybercriminals to receive funds from victims around the world without the option to freeze or refund them due to the immutable nature of the virtual funds.
• Safe havens are countries that permit cybercriminals to launch attacks without immediate fear of arrest, enabling them to earn vast fortunes through ransomware campaigns.

With these three challenges in mind, law enforcement and governments have a very difficult job to do when it comes to fighting ransomware but fight it they must. In this blog we shall recall what counter-ransomware activities took place in 2024, analyse their effectiveness, and assess how the landscape shall evolve as a result.

A podcast version of this blog is also available here.

Ransomware Operator Arrests and Sanctions

During 2024, there were significant disruption operations by law enforcement and financial authorities targeting individuals behind ransomware campaigns (see the Table below). The main focus of 2024 for Western law enforcement was squarely on the LockBit RaaS and its affiliates as it was the largest and highest earning ransomware operation to date.

Several key players of the ransomware ecosystem were arrested, including the main developer of LockBit ransomware. Interestingly, Russian law enforcement also decided to arrest ransomware threat actors located in Moscow and Kaliningrad as well.

The ransomware ecosystem has fragmented due to the law enforcement disruptions of the largest players, such as ALPHV/BlackCat and LockBit. In the case of ALPHV/BlackCat, the operators staged a law enforcement takedown as they put up a fake seizure notice as part of an exit scam in March 2024 after the attack on UnitedHealth.

Following these disruptions, some affiliates have migrated to less effective strains or launched their own strains. This includes Akira and RansomHub at the top of the list as well as Hunters International and PLAY.

Cryptocurrency Exchanges Disrupted

During 2024, law enforcement seized funds from and sanctioned a number of cryptocurrency exchanges and individuals running payment processors using cryptocurrency (see the Table below).

One of the most interesting disclosures this year came from the UK National Crime Agency (NCA) around Operation Destablise. The NCA linked payments to ransomware gangs to money laundering networks used by Russian oligarchs to covertly purchase property and Russia Today, the state-run media organization, to covertly fund pro-Russia foreign entities.

Another notable investigation in 2024 was when the US Treasury sanctioned more Russian cryptocurrency exchanges, such as PM2BTC and Cryptex, that led to money launderers that facilitate the cashing out of ransom payments being arrested by Russian law enforcement.

Safe Havens Enabling Ransomware

While ransomware is a global problem, there are only a few countries that are to blame for this rapid expansion of the ransomware ecosystem. The state that is blamed the most for preventing many ransomware operators from facing justice is Russia. There are explicit rules posted to Russian-speaking cybercrime forums that state as long as members avoid targeting Russia and the Commonwealth of Independent States (CIS), they are free to operate.

The Russian ransomware safe haven theory was further proven following sanctions levied against Evil Corp by the UK, US, and Australia. One of the sanctioned men connected to Evil Corp was Eduard Benderskiy, a former Russian federal security service (FSB) official. Benderskiy is reportedly the father-in-law of Maksim Yakubets, the leader of Evil Corp, an organized cybercrime group responsible for multiple ransomware strains including BitPaymer, WastedLocker, Hades, PhoenixLocker, and MacawLocker. In total, Evil Corp has reportedly extorted at least $300 million from victims globally, according to the UK NCA. It is now clear that Evil Corp has protection from a highly connected Russian FSB official who has also been involved in multiple overseas assassinations on behalf of the Kremlin, according to Bellingcat investigators.

While a number of ransomware operators were arrested in 2024 and some were extradited to the US, the work done by law enforcement specializing in cybercrime was put in the spotlight during the August 2024 prisoner swap. Multiple countries decided to release cybercriminals, spies and an assassin as part of a historic prisoner exchange with Russia at an airport in Ankara, Turkey. The US negotiated the release of 16 people from Russia, including five Germans as well as seven Russian citizens who were political prisoners in their own country.

Notably, from a cybercrime intelligence perspective, the Russian nationals released from the West included the infamous cybercriminals Roman Seleznev and Vladislav Klyushin. The latter, Klyushin, was sentenced in 2023 to nine years in US prison after he was caught in a $93 million stock market cheating scheme that involved hacking into US companies for insider knowledge. The other cybercriminal, Seleznev, was sentenced to 27 years in prison in 2017 for stealing and selling millions of credit card numbers from 500 businesses using point-of-sale (POS) malware and causing more than $169 million in damage to small businesses and financial institutions, including those in the US.

In 2024, we saw several more Russian nationals get extradited to the US after being arrested by law enforcement in the country they were residing in. This includes the Phobos operator living in South Korea and the LockBit developer living in Israel. This follows others arrested in previous years such as a TrickBot developer arrested in South Korea as well as the two LockBit affiliates extradited to the US. There is a potential that these Russian nationals involved in ransomware could be used in prisoner exchanges in the future.

Further, another curious trend in 2024 was that some Russians inside Russia, which is firmly considered a safe haven for ransomware gang, did get arrested. This includes the SugarLocker operators arrested in Moscow and the LockBit affiliate Wazawaka who was arrested in Kaliningrad. This is alongside the money launderers arrested around Russia linked to the Cryptex exchange.

The arrests of Russian nationals in Russia for ransomware activities appear to be more symbolic than a true crackdown on this type of activity. This is because there are several dozen Russian-speaking ransomware gangs that continue to operate, as well as a plethora of other types of cybercrime in the Russian-speaking underground.

Outlook

In 2024, there was lots of significant action by law enforcement to shake up the ransomware economy. One of the main successes of the notable Operation Cronos action taken against LockBit was the sowing of distrust and disharmony in the ransomware ecosystem. Despite the admins of LockBit trying to recover, their reputation and army of affiliates have been smashed.

Many of Russian law enforcement activities could all be related to the costs of the Russian invasion of Ukraine. Russian authorities seizing funds of the illicit cryptocurrency exchanges could be to pay for the war in Ukraine and they could be recruiting arresting cybercriminals for offensive cyber operations related to the war in Ukraine. The true motivations of Russian law enforcement arresting these specific ransomware operators but allowing others to operate are unclear. The cybercriminals could also simply have not paid their protection money or lack connections in the FSB like Evil Corp has.

Due to the fall of LockBit and ALPHV/BlackCat in 2024, there has been a rise of other ransomware groups like RansomHub and Akira to fill the vacuum. However, the rate of attacks by these emerging groups is still noticeably lower than when LockBit was operating at full force. This should be perceived as a success for law enforcement operations in 2024 due to the overall number of ransomware attacks lowering, which we should all be thankful for.