Executive Summary
TrymeLocker (associated with the actor 'inwormmap') is a highly aggressive .NET-based locker and ransomware family that prioritizes total system capture and sabotage over simple file encryption. It utilizes more than eight independent persistence mechanisms, including hijacking accessibility tools (IFEO) and modifying the Winlogon shell, to ensure survival across reboots. The malware is notable for its destructive capabilities, such as permanently deleting cmd.exe, disabling Windows Recovery and System Restore, and creating 32 hidden backdoor accounts.
Technically, the malware employs 'hydra-like' behavior by propagating 100 uniquely named copies of itself across system directories. It actively kills security processes and implements a watchdog loop to reapply system restrictions if they are modified. The malware also performs psychological sabotage by replacing system fonts with Wingdings and forcing an Arabic keyboard layout. It uses a hardcoded Telegram bot to exfiltrate victim data, including IP addresses and geolocation.
Due to the extensive system modifications, including registry sabotage and the deletion of core system files like cmd.exe, infected systems are often unrecoverable through standard repair methods. Organizations should focus on identifying the specific IOCs and persistence keys to prevent initial execution and propagation.