Suspected Russian phishing via Signal targeted German officials, exploiting trust to access accounts and sensitive political communications.

A new wave of cyber operations targeting European political leadership is once again highlighting how modern espionage increasingly relies on deception rather than technical exploits. Recent investigations by German authorities point to a large-scale phishing campaign conducted via the Signal messaging platform, with strong suspicions of Russian involvement.

According to multiple reports [1, 2, 3], the campaign targeted high-profile individuals, including German politicians, ministers, military personnel, diplomats, and journalists. German prosecutors have launched an investigation into what they believe may be a coordinated espionage effort, with early evidence suggesting a state-sponsored actor.

The attack did not rely on malware or vulnerabilities in Signal itself. Instead, it exploited human trust—arguably the weakest link in cybersecurity. Victims were approached through messages impersonating official Signal support or trusted contacts, prompting them to share authentication codes, scan malicious QR codes, or click on crafted links. Once compromised, attackers gained access to private chats, contact lists, and potentially sensitive political discussions.

One of the most notable targets was Julia Klöckner, whose account was reportedly compromised through a phishing attempt embedded in what appeared to be a legitimate group chat linked to her political party. The operation also attempted to target German Chancellor Friedrich Merz, although no compromise was confirmed in that case.

Authorities estimate that hundreds of accounts may have been affected. While Berlin has not formally attributed the campaign, intelligence sources increasingly point toward Russian involvement, consistent with a broader pattern of cyber activities aimed at European democracies.

“The German government suspects Russia is behind a series of phishing attacks on Signal targeting high-ranking politicians, including two government ministers, military personnel and journalists, a government spokesperson said.

“Federal prosecutors have been conducting a preliminary investigation since mid-February 2026 into alleged cyberattacks on Signal accounts, a spokesperson for the federal prosecutors confirmed on Saturday. Among other things, the investigation involves an initial suspicion of espionage, she added, without specifying which country might be involved.” reads the report published by the Associated Press.

“The German government has still not officially attributed the attacks to Russia.”

This incident is not isolated. Over the past decade, Western intelligence agencies have repeatedly linked Russian state-backed groups to cyber espionage and influence operations targeting political institutions. These activities are part of a broader strategy often described as “hybrid warfare,” where cyber operations, disinformation, and psychological tactics are combined to achieve geopolitical objectives without direct military confrontation.

Security experts stress that what makes this campaign particularly concerning is its simplicity and effectiveness. Instead of exploiting software flaws, attackers leveraged legitimate platform features and social engineering techniques. This approach allows them to bypass many traditional security controls and remain largely undetected.

We are witnessing a new phase of hybrid warfare, where attackers don’t need to break encryption—they just trick the user. The human factor has become the primary attack surface.”

Targeting secure messaging platforms like Signal demonstrates how threat actors adapt quickly to changing communication habits. When politicians and officials move to more secure platforms, adversaries follow them. The battlefield is no longer the infrastructure, but the user.”

Another critical aspect is the potential impact. Access to private conversations between political leaders, policymakers, and diplomats can provide strategic intelligence, enable blackmail, or support disinformation campaigns. Even limited breaches can undermine trust in secure communication tools and institutions.

German authorities, including the Federal Office for the Protection of the Constitution (BfV) and the Federal Office for Information Security (BSI), have already issued warnings about similar tactics earlier this year. They highlighted that such campaigns are likely ongoing and could expand to other platforms like WhatsApp or Telegram.

The broader implication is clear: cybersecurity is no longer just a technical issue but a geopolitical one. As digital communication becomes central to governance, diplomacy, and decision-making, it also becomes a primary target for intelligence operations.

This campaign serves as a reminder that even the most secure technologies cannot protect against deception if users are not adequately trained and aware. In today’s threat landscape, resilience depends not only on encryption and infrastructure but also on human vigilance.

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Pierluigi Paganini

(SecurityAffairs – German officials, Bundestag)

Alleged German cybercrime figure behind Fluxstress and Neldowner arrested in Thailand after years running global DDoS-for-hire services across countries.

Former BND VP Arndt Freytag von Loringhoven was targeted in a Signal cyberattack, part of a wave hitting officials and politicians in Germany.

A cyberattack targeting Signal and WhatsApp users has hit high-ranking German officials, including former BND Vice President Arndt Freytag von Loringhoven. The official reported being contacted by someone posing as Signal support and asked for his PIN. This incident highlights a broader cyber espionage campaign against sensitive individuals in security agencies and political positions.

“He is far from the only prominent victim of the global wave of attacks against user accounts at Signal and WhatsApp. According to SPIEGEL, high-ranking German politicians have reported themselves to the authorities as victims, and active officials in security agencies have also been attacked.” reads the report published by SPIEGEL. Back in February, the Federal Office for the Protection of the Constitution (BfV) and the Federal Office for Information Security (BSI) classified the attack as “security-relevant” and urged those affected to come forward. The BfV stated that this warning met with a “high response” and that they believe it prevented even worse damage.”

German authorities warned Signal users to check for suspicious signs, such as unknown devices listed under “paired devices” or unexpected prompts to re-register accounts.

In the case of former BND official Arndt Freytag von Loringhoven, attackers used his compromised account to send a malicious link to contacts. He quickly warned them not to open it and deleted his account. Investigators believe the incident is part of ongoing hybrid campaigns linked to Russia. Given Loringhoven’s work on Russian hybrid warfare and his book Putin’s Attack on Germany, he was likely considered a high-value target.

“Signal said the recent incidents were targeted phishing attacks that allowed attackers to hijack accounts of officials and journalists. The company stressed that its encryption and infrastructure were not compromised and remain secure.” Signal wrote on X. “We are aware of recent reports regarding targeted phishing attacks that have resulted in account takeovers of some Signal users, including government officials and journalists. We take this very seriously. To be clear: Signal’s encryption and infrastructure have not been compromised and remain robust.”

We are aware of recent reports regarding targeted phishing attacks that have resulted in account takeovers of some Signal users, including government officials and journalists. We take this very seriously.

To be clear: Signal’s encryption and infrastructure have not been…

— Signal (@signalapp) March 9, 2026

Signal warned that the attacks rely on social engineering, with attackers posing as trusted contacts or fake support services to trick users into sharing verification codes or PINs. The company stressed it will never ask for these details via messages or social media and urged users to stay vigilant and never share login codes.

In early March, Dutch intelligence agencies (MIVD and AIVD) warned of a global campaign by Russia-linked threat actors aiming to compromise Signal and WhatsApp accounts. The operation targets government officials, civil servants, and military personnel, highlighting growing cyber risks to sensitive communications among national security actors.

“Russian state hackers are engaged in a large-scale global cyber campaign to gain access to Signal and WhatsApp accounts belonging to dignitaries, military personnel and civil servants. The Dutch intelligence and security services MIVD and AIVD can confirm that targets and victims of the campaign include Dutch government employees.” reads the alert by Dutch intelligence agencies. “The Dutch services also believe that other persons of interest to the Russian government, such as journalists, may possibly be targeted by this campaign.”

Russian cyber spies are tricking users into revealing verification codes to hijack Signal and WhatsApp accounts. They impersonate Signal Support or exploit the “linked devices” feature, gaining access to messages and chat groups, potentially exposing sensitive information from government and military targets.

Dutch intelligence warned that Russia targets Signal for its strong end-to-end encryption, aiming to access sensitive government communications. Officials stress that apps like Signal and WhatsApp should not be used for classified or confidential information.

The government experts pointed out that attackers don’t exploit app vulnerabilities but abuse legitimate features of Signal and WhatsApp. Only individual accounts are targeted, not the platforms themselves, officials say.

Dutch intelligence agencies recommend Signal users to carefully monitor their group chats for signs of compromised accounts. If a contact appears twice under the same or slightly altered name, this may indicate a compromised account or a victim-created account. Users should report suspicious cases to their organization’s information security team and verify the accounts through alternative channels such as email or phone. Group administrators should remove any unauthorized accounts, after which legitimate members can rejoin. Actor-controlled accounts may change display names, e.g., to “Deleted account,” or join via a shared Group Link, triggering notifications. Users should remain vigilant for unfamiliar members and unusual account behavior. If there is any suspicion that the group administrator has been compromised, it is recommended to leave the chat group and create a new one to ensure the security and integrity of communications within the group.

In February 2025, Google Threat Intelligence Group (GTIG) researchers warned of multiple Russia-linked threat actors targeting Signal Messenger accounts used by individuals of interest to Russian intelligence. The experts speculated that the tactics, techniques, and procedures used to target Signal will be prevalent in the near term, and they will also be employed in regions outside Ukraine.

Russian hackers exploited Signal’s “linked devices” feature, they used specially crafted QR codes to link victims’ accounts to attacker-controlled devices, and then spy on them.

“The most novel and widely used technique underpinning Russian-aligned attempts to compromise Signal accounts is the abuse of the app’s legitimate “linked devices” feature that enables Signal to be used on multiple devices concurrently. Because linking an additional device typically requires scanning a quick-response (QR) code, threat actors have resorted to crafting malicious QR codes that, when scanned, will link a victim’s account to an actor-controlled Signal instance.” reads the report published by GTIG. “If successful, future messages will be delivered synchronously to both the victim and the threat actor in real-time, providing a persistent means to eavesdrop on the victim’s secure conversations without the need for full-device compromise.”

Researchers also reported that Russian and Belarus-linked threat actors were able to steal Signal database files from Android and Windows devices using scripts, malware, and command-line tools for data exfiltration.

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Pierluigi Paganini

(SecurityAffairs – hacking, intelligence)

Arrest warrants issued for ringleaders after investigation by police in Europe and North America

European and North American cybercrime investigators say they have dismantled the heart of a malware operation directed by Russian criminals after a global operation involving British, Canadian, Danish, Dutch, French, German and US police.

International arrest warrants have been issued for 20 suspects, most of them living in Russia, by European investigators while indictments were unsealed in the US against 16 individuals.

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© Photograph: Andrew Brookes/Getty Images/Image Source

© Photograph: Andrew Brookes/Getty Images/Image Source