Backdoor
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CISA details BRICKSTORM backdoor used by PRC-linked hackers against vSphere and Windows environments
CISA has published technical details of BRICKSTORM, a Golang backdoor used by PRC-linked threat actors to maintain stealthy, long-term access to VMware vSphere and Windows environments; CrowdStrike and other firms link the tool to UNC5221 and Warp Panda, while the Chinese embassy has denied the allegations.
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Iran-linked MuddyWater group deploys MuddyViper backdoor against Israeli targets
Researchers say Iranian-linked MuddyWater has used a new MuddyViper backdoor, delivered via a Fooder loader, to target Israeli organisations across multiple sectors and to harvest credentials and browser data.
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Mandiant ties UNC1549 to long-running campaign using TWOSTROKE and DEEPROOT against aerospace and defence
Google-owned Mandiant linked a cluster it tracks as UNC1549 to a campaign from late 2023 through 2025 in which suspected Iranian espionage actors used backdoors including TWOSTROKE and DEEPROOT to target aerospace, aviation and defence organisations by exploiting third-party credentials, VDI breakouts and targeted phishing.
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Microsoft finds SesameOp backdoor that uses OpenAI Assistants API for C2
Microsoft’s DART reported discovery of a custom .NET backdoor called SesameOp that uses the OpenAI Assistants API as a covert command-and-control channel; Microsoft shared its findings with OpenAI, which disabled a suspected API key, and the victim remains unnamed.
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Confucius-linked phishing in Pakistan used WooperStealer and Anondoor, researchers say
Researchers say the Confucius hacking group targeted Pakistani users with phishing lures that delivered WooperStealer and, in later attacks, a Python backdoor called Anondoor; Fortinet and K7 Security Labs described the techniques and capabilities but did not disclose victim counts.
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Researchers find malicious ‘postmark-mcp’ npm package that forwarded emails to attacker
Researchers say a malicious npm package named “postmark-mcp” copied an official library and, beginning with version 1.0.16, BCC’d every email to an external address, exposing potentially sensitive communications; the package has been removed from npm and users are urged to revoke credentials and check logs.
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Fake Microsoft Teams installers promoted in search ads deliver Oyster backdoor, researchers say
Search ads and SEO poisoning have been used to promote fake Microsoft Teams installers that deliver the Oyster backdoor to Windows machines, researchers said; the trojanized installer drops a DLL and creates a scheduled task for persistence.
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Iran-linked Subtle Snail Targets European Telecoms in LinkedIn Recruitment Scheme, 34 Devices Infected
A Iran-linked cyber espionage group known as UNC1549, also called Subtle Snail, has been attributed to a campaign against European telecommunications firms, infiltrating 34 devices across 11 organizations through LinkedIn-based recruitment lures and a modular backdoor named MINIBIKE designed for long-term data exfiltration.
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Chinese APT deploys EggStreme fileless framework in Philippines attack, Bitdefender says
A Chinese APT group has been linked to compromising a Philippines-based military services company using EggStreme, a new fileless malware framework designed for memory-resident espionage, with a backdoor capable of extensive reconnaissance and data theft.
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TamperedChef information stealer emerges in malvertising campaign promoting AppSuite PDF Editor
Cybersecurity researchers have identified a malvertising campaign delivering a backdoored PDF editor, AppSuite PDF Editor, that drops a new information stealer dubbed TamperedChef. The operation leverages Windows Registry persistence, a C2-enabled backdoor, and widespread Google ad campaigns to maximize downloads.
