ThreatsDay Bulletin: Kali Linux + Claude, Chrome Crash Traps, WinRAR Flaws, LockBit & 15+ Stories

Kali Linux, an advanced penetration testing Linux distribution used for ethical hacking and network security assessments, has added an integration with Anthropic’s Claude large language model through the Model Context Protocol (MCP) to issue commands in natural language and translate them into technical commands.

ResidentBat is an Android spyware implant used by Belarusian authorities for surveillance operations against journalists and civil society. Once installed, it provides operators with access to call logs, microphone recordings, SMS, encrypted messenger traffic, screen captures, and locally stored files. The malware, although first documented in December 2025, is assessed to date back to 2021. According to Censys, ResidentBat-associated infrastructure is concentrated in Europe and Russia: the Netherlands (5 hosts), Germany (2 hosts), Switzerland (2 hosts), and Russia (1 host) in a recent Platform view, using a narrow port range (7000-7257) for control traffic.

Phishing campaigns are impersonating cryptocurrency brokerage services like Bitpanda to harvest sensitive data under the pretext of reconfirming their information or risk having their accounts blocked. “Attempting to get multiple forms of information and identification, the attackers used tactics that would seem legitimate to the everyday user,” Cofense said. “User information such as name verification, email, and password credentials, and location were all used in this attempt to harvest information under the guise of a multi-factor authentication process.”

In a similar report, ReliaQuest said the fastest intrusions reached lateral movement in just 4 minutes, an 85% acceleration from last year, with data exfiltration taking place in 6 minutes. The statistic is fueled by attackers increasingly weaving AI and automation into their tradecraft. “As attackers increasingly secure valid credentials with elevated privileges, the time to react has drastically dropped,” ReliaQuest said. “In 2025, the average breakout time (initial access to lateral movement) dropped to 34 minutes. In 47% of incidents, they secured high privileges before ever touching the network. This allows them to skip escalation, blend into traffic, and repurpose legitimate tools.”

Mac users searching for popular software like Homebrew, 7-Zip, Notepad++, LibreOffice, and Final Cut Pro are the target of an active malvertising campaign powered by at least 35 hijacked Google advertiser accounts originating from countries including the U.S., Canada, Italy, Poland, Brazil, India, Saudi Arabia, Japan, China, Romania, Malta, Slovenia, Germany, the U.K., and the U.A.E. More than 200 malicious advertisements impersonating legitimate macOS software have been found. The end goal of these efforts is to direct users to fake pages that contain ClickFix-like instructions to deliver MacSync stealer. Another ClickFix campaign has been observed using fake CAPTCHA verification lures on bogus phishing pages to distribute stealer malware that can harvest data from web browsers, gaming apps like Steam, cryptocurrency wallets, and VPN apps. According to ReliaQuest data, a quarter of attacks used social engineering for initial access last year, with ClickFix responsible for delivering 59% of the top malware families.

Meta went ahead with a plan to encrypt the messaging services connected to its Facebook and Instagram apps despite internal warnings that it would hinder the social media giant’s ability to flag child-exploitation cases to law enforcement, Reuters reported. The internal chat exchange dated March 2019 was filed in connection with a lawsuit brought by the U.S. state of New Mexico, accusing it of exposing children and teens to sexual exploitation on its platforms and profiting from it. In response to the concerns raised, Meta said it worked on additional safety features before it launched encrypted messaging on Facebook and Instagram in 2023.

Threat actors are exploiting a now-patched security flaw in internet-facing Apache ActiveMQ servers (CVE-2023-46604) to deploy LockBit ransomware. “Despite being evicted after the initial intrusion, they successfully breached the same server on a second occasion 18 days later,” The DFIR Report said. “After compromising the server, the threat actor used Metasploit, possibly along with Meterpreter, to perform post-exploitation activities. These activities included escalating privileges, accessing LSASS process memory, and moving laterally across the network. After regaining access following their eviction, the threat actor swiftly transitioned to deploying ransomware. They leveraged credentials extracted during their previous breach to deploy LockBit ransomware via RDP.” The ransomware is suspected to be crafted using the leaked LockBit builder.

Two newly flagged Google Chrome extensions, Pixel Shield – Block Ads (ID: nlogodaofdghipmbdclajkkpheneldjd) and PageGuard – Phishing Protection (ID: mlaonedihngoginmmlaacpihnojcoocl), have been found to adopt the same playbook as CrashFix, where the browser is deliberately crashed, and the user is tricked into running a malicious command à la ClickFix. The most concerning aspect of this campaign is that the extensions actually work and offer the advertised functionality. “The original NexShield DoS created a billion chrome.runtime.connect() calls,” Annex Security’s John Tuckner said. “These variants use a different technique I’m calling the Promise Bomb because it crashes the browser by flooding Chrome’s message passing system with millions of unresolvable promises.” While the original NexShield used timer-based activation, the new variants have evolved to push notification-based command-and-control (C2), causing the denial-of-service to be triggered only when the C2 server sends a push notification containing a “newVersion” value ending in “2.” This, in turn, gives the attacker selective remote control over when the crashes happen.

Cybersecurity firm Stairwell said more than 80% of the IT networks it monitors run versions of WinRAR vulnerable to CVE-2025-8088, a vulnerability that has been widely exploited by cybercrime and cyber espionage groups. “This finding underscores a persistent challenge in enterprise security when widely deployed, trusted software that quietly falls out of date and becomes a high-value target for attackers,” Alex Hegyi said.

A new analysis from Trail of Bits has revealed that more than 723,000 open-source projects use cryptographic libraries with insecure defaults. The aes-js and pyaes libraries have been found to provide a default initialization vector (IV) in their AES-CTR API, leading to a large number of key/IV reuse bugs. “Reusing a key/IV pair leads to serious security issues: if you encrypt two messages in CTR mode or GCM with the same key and IV, then anybody with access to the ciphertexts can recover the XOR of the plaintexts, and that’s a very bad thing,” Trail of Bits said. While neither library has been updated in years, strongSwan has released an update to address the problem in strongMan (CVE-2026-25998).

OpenAI and Paradigm have jointly announced EVMbench, a benchmark that measures how well AI agents can detect, exploit, and patch high-severity smart contract vulnerabilities. “EVMbench draws on 120 curated vulnerabilities from 40 audits, with most sourced from open code audit competitions,” OpenAI said. “EVMbench is intended both as a measurement tool and as a call to action. As agents improve, it becomes increasingly important for developers and security researchers to incorporate AI-assisted auditing into their workflows.”

A Russian national has been accused of trying to extort money from the notorious Conti ransomware group by posing as an officer of Russia’s Federal Security Service (FSB), according to local media reports. RBC reported that the suspect, Ruslan Satuchin, posed as an FSB officer and demanded a large payment from Conti. Although an investigation was formally launched in September 2025, the incident allegedly began in September 2022 when Satuchin contacted one of the members of the hacker group and extorted them to avoid criminal liability. Once a prolific ransomware gang, Conti shut down its operations in mid-2022 after splintering into small groups.

Varonis has disclosed details of a newly identified cybercrime service known as 1Campaign that enables threat actors to run malicious Google Ads for extended periods of time while evading scrutiny. The cloaking platform “passes Google’s screening, filters out security researchers, and keeps phishing and crypto drainer pages online for as long as possible, funneling real users to attacker-controlled sites,” Varonis security researcher Daniel Kelley said. “It combines real-time visitor filtering, fraud scoring, geographic targeting, and a bot guard script generator into a single dashboard.” It’s developed and maintained by a threat actor named DuppyMeister for over three years, along with offering Telegram channels for support. Traffic linked to 1Campaign has been distributed across the U.S., Canada, the Netherlands, China, Germany, France, Japan, Hungary, and Albania.

A social engineering campaign has been observed using Microsoft Teams meetings to trick attendants into installing macOS malware. Daylight Security has assessed that the activity is consistent with an ongoing attack campaign orchestrated by North Korean threat actors under the name GhostCall. “During the call, the attacker claimed audio issues and coached the victim into running terminal commands that downloaded and executed malicious binaries,” Daylight researchers Kyle Henson and Oren Biderman said. “Analysts observed staged downloads and execution from macOS cache and temporary paths, Keychain credential access, and outbound connections to newly created attacker-controlled domains.”

Last month, law enforcement authorities from the U.S. seized the notorious RAMP cybercrime forum. The event has had a cascading impact, destabilising trust and accelerating fragmentation across the underground cybercrime ecosystem. There are also speculations that RAMP may have functioned as a honeypot or had been compromised long before its seizure. “Rather than consolidating around a single successor, ransomware actors are redistributing across both gated platforms like T1erOne and accessible forums such as Rehub,” Rapid7 said. “This shift reflects adaptation, not decline. Disruption fractures trust and redistributes coordination across multiple platforms.”

Spanish authorities have announced the arrest of four members of the Anonymous Fénix group for their involvement in distributed denial-of-service (DDoS) attacks. The suspects, whose names were not disclosed, targeted the websites of government ministries, political parties, and public institutions. Two of the group leaders were arrested in May 2025. The first attacks occurred in April 2023. The group is said to have intensified its activities beginning in September 2024, recruiting volunteers to mount DDoS attacks against targets of interest.

A spear-phishing campaign has been observed targeting Argentina’s judicial sector that delivers a ZIP archive containing a Windows shortcut that, when launched, displays a decoy PDF to the victims, while stealthily dropping a Rust-based remote access trojan (RAT). “The campaign leverages highly authentic judicial decoy documents to exploit trust in court communications, enabling successful delivery of a covert remote access trojan and facilitating long-term access to sensitive legal and institutional data,” Seqrite Labs said.

A persuasive lookalike website of Huorong Security antivirus (“huoronga[.]com”) has been used to deliver a RAT malware known as ValleyRAT. The campaign is the work of a Chinese cybercrime group called Silver Fox, which has a history of distributing trojanized versions of popular Chinese software and other popular programs through typosquatted domains to distribute trojanized installers responsible for deploying ValleyRAT. “Once it’s installed, attackers can monitor the victim, steal sensitive information, and remotely control the system,” Malwarebytes said.

Users searching for developer tools have become the target of an ongoing campaign dubbed GPUGate that uses a malicious installer to deliver Hijack Loader and Atomic Stealer. “The attacker creates a throwaway GitHub account and forks the official GitHub Desktop repository,” GMO Cybersecurity by Ierae said. “The attacker edits the download link in the README to point to their malicious installer and commits the change. Lastly, the attacker used sponsored ads for ‘GitHub Desktop’ to promote their commit, using an anchor in README.md to skip past GitHub’s cautions.” Victims who downloaded the malicious Windows installer would execute a multi-stage loader, while Mac victims received Atomic Stealer.