After bypassing the password (using a tool like john or hashcat if a hint was provided) or fixing the corrupt file header, I successfully extracted the contents:
When the file (e.g., Readme.txt ) is clicked, WinRAR executes a malicious script (e.g., Readme.txt .cmd ) within the folder of the same name. TTTT.rar
: Checking the file signature in a hex editor. A standard RAR 5.0 signature should be 52 61 72 21 1A 07 01 00 . If it differs, the file might be masquerading as a RAR. 2. Identifying Anomalies After bypassing the password (using a tool like