Threats Tagged 'github c2'

In July 2026, a new Rust-based malware family called C2Looper was identified, likely used by ransomware-related threat actors. The malware is assessed with low to medium confidence to be delivered through multi-stage ClickFix infection chains. C2Looper provides backdoor capabilities including remote shell execution, reconnaissance, and deploying additional payloads. It dynamically resolves Windows APIs and encrypts strings using XOR operations. The malware communicates via plaintext HTTP initially, but an evolved version uses GitHub repositories for command-and-control operations, storing commands and exfiltrated data in JSON files. Version 2 introduces additional commands such as reconnaissance collection, drive enumeration, shellcode injection, and file listing. The malware demonstrates active development with refined capabilities, likely serving initial access brokers for data theft and ransomware deployment.

On March 12, 2026, a sophisticated attack campaign was identified targeting Chinese-speaking individuals using military-themed document lures distributed through a malicious ZIP archive. The operation employed a trojanized SumatraPDF binary as the initial vector to deploy an AdaptixC2 Beacon and Visual Studio Code on victim systems. The shellcode loader demonstrated significant similarities to the TOSHIS loader previously linked to TAOTH campaigns. Attackers established a custom AdaptixC2 Beacon listener utilizing GitHub for command-and-control infrastructure. The staging server infrastructure additionally hosted CobaltStrike Beacon and EntryShell backdoor, both previously associated with this threat group. The campaign infrastructure included multiple compromised domains and IP addresses for malware distribution and C2 communications.

MediumMalwareChina#sumatrapdf#cobaltstrike#adaptixc2 beacon