top of page
ALL POSTS
Chaos Ransomware's msaRAT: Leveraging Browser-Based Covert C2 Channels to Evade Detection
Key Findings Cisco Talos discovered msaRAT, a Rust-based remote access trojan used by the Chaos ransomware group that routes all command-and-control traffic through Chrome or Edge browsers The malware never makes direct network connections; it exclusively uses Chrome DevTools Protocol (CDP) to manipulate the victim's browser for C2 communications msaRAT establishes WebRTC DataChannels through Cloudflare Workers for signaling and Twilio TURN relays for actual C2 traffic, makin
Jul 233 min read
Gootloader's Evasion Tactics: Exploiting Malformed ZIP Files
Key Findings GootLoader malware uses malformed ZIP files made of hundreds of concatenated archives to evade detection. GootLoader is used by ransomware actors for initial access, then handed off to others. GootLoader runs on an access-as-a-service model and has been known to deliver threats like SunCrypt, REvil, Kronos, and Cobalt Strike. The ZIP file is intentionally broken so many security and analysis tools can't open it, but Windows can, helping the malware avoid detectio
Jan 181 min read
Gootloader Malware Employs Massive Concatenated ZIP Archives for Evasion
Key Findings GootLoader malware is using a malformed ZIP archive with 500-1,000 concatenated ZIP files to evade detection The malicious ZIP file is designed to trigger parsing errors in many unarchiving tools, but can still be extracted by the default Windows unarchiver GootLoader employs "hashbusting" techniques by randomizing values in non-critical ZIP file fields to generate unique payloads for each victim The attack involves delivering the malicious ZIP as an XOR-encoded
Jan 162 min read
Spy vs. spy: How GenAI is powering defenders and attackers
Key Findings: Adversaries continue to use GenAI with varying levels of reliance, with state-sponsored groups and criminal organizations taking advantage of uncensored and unweighted models. Threat actors are using GenAI for coding, phishing, anti-analysis/evasion, and vulnerability discovery, although significant human involvement is still required. As models continue to shrink and hardware requirements are removed, adversarial access to GenAI and its capabilities are poised
Dec 4, 20252 min read
bottom of page
