AMSI Bypass

2026-07-0817 minPalo Alto Networkshigh

A financially motivated campaign active in April 2026 delivers Vidar stealer and XMRig cryptocurrency miner to victims worldwide via malvertising for fake software cracks. The campaign uses the Factory-v3 Go loader framework with per-build unique binaries, fabricated Authenticode certificates impersonating legitimate brands, file-size inflation up to 491 MB to evade sandbox analysis, and an in-memory AMSI bypass. Vidar exfiltrates browser credentials, cookies, and crypto wallets to C2 servers, while XMRig mines Monero using the pool.supportxmr.com mining pool. The operator receives Telegram notifications for each new infection.

A structured, multi-stage infection chain delivers the CrySome RAT via a logistics-themed spear-phishing lure. Initial access is achieved through a fake rate confirmation portal that drops a batch file, which chains UAC bypass (ICMLuaUtil COM interface), in-memory AMSI patching, and the open-source WinDefCtl utility to weaken Microsoft Defender before deploying the persistent RAT payload. CrySome RAT provides the operator with remote command execution, credential theft from Chromium browsers, HVNC, keylogging, and persistence via a scheduled task executing every 5 minutes.

2026-07-0610 minCheck Pointcritical

This weekly threat intelligence bulletin covers multiple active ransomware campaigns, four critical vulnerabilities under active exploitation, and emerging AI-driven threats. Notable items include actively exploited RCE flaws in Oracle E-Business Suite and Progress Kemp LoadMaster, a Citrix NetScaler memory disclosure flaw exploited within 24 hours of disclosure, a North Korean supply-chain campaign (PolinRider) deploying 108 malicious packages, and a proof-of-concept browser-native ransomware generated by an LLM abusing Chrome's File System Access API.

2026-06-026 minANY.RUNhigh

JS.MonoGlyphRAT is a newly identified, highly obfuscated JavaScript backdoor targeting US enterprises via phishing. It establishes persistence, communicates over HTTP using custom headers, and acts as a loader capable of executing AES-encrypted payloads, PowerShell commands, and in-memory .NET assemblies while bypassing AMSI.

A financially motivated eCrime campaign is leveraging SEO poisoning to impersonate AI coding assistants like Gemini CLI and Claude Code, tricking developers into executing a fileless PowerShell infostealer. The malware executes entirely in memory, disables Windows telemetry (ETW and AMSI), and harvests sensitive enterprise credentials, session tokens, and files before exfiltrating them to attacker-controlled infrastructure.

2026-05-146 minMicrosoftcritical

Kazuar is a sophisticated, modular P2P botnet attributed to the Russian state-sponsored actor Secret Blizzard. It utilizes a tripartite architecture (Kernel, Bridge, Worker) and a leader election mechanism to minimize external C2 traffic, relying on Mailslots, Window Messaging, and Named Pipes for internal communication and HTTP, WSS, or EWS for external C2.

2026-05-136 minZscaler ThreatLabzhigh

Threat actors are exploiting the OpenClaw AI agent framework by publishing a deceptive 'DeepSeek-Claw' skill that distributes malware. The campaign utilizes malicious installation instructions to deploy Remcos RAT on Windows via DLL sideloading and GhostLoader on macOS/Linux via obfuscated Node.js scripts, enabling persistent access and data exfiltration.

2026-05-137 minWithSecurehigh

Threat actors are leveraging social media platforms, SEO poisoning, and AI agent responses to distribute ClickFix-style attacks disguised as tech tips. Victims are socially engineered into executing malicious PowerShell commands that initiate a fileless infection chain, bypassing traditional security controls to deploy information stealers like Vidar on their endpoints.

2026-05-137 minTrend Microhigh

A targeted campaign is delivering the PureLog Stealer via localized copyright violation lures. The attack employs a sophisticated multi-stage infection chain, utilizing a Python-based loader to bypass AMSI, establish registry persistence, and execute the final .NET stealer entirely in memory to evade detection.

2026-05-135 minZscaler ThreatLabzhigh

SnappyClient is a newly discovered C++ C2 framework implant delivered via HijackLoader, primarily designed for cryptocurrency theft and remote access. It utilizes advanced evasion techniques such as AMSI patching, Heaven's Gate, and transacted hollowing to bypass security controls, including Chromium's App-Bound Encryption, while communicating over a custom ChaCha20-Poly1305 encrypted protocol.