Rewterz Threat Alert – STOP (DJVU) Ransomware – Active IOCs

Severity

Medium

Analysis Summary

The STOP/DJVU ransomware initially made headlines in 2018 and has since been attacking individuals all around the world. It’s widespread on torrent sites and other platforms in software crack packages and adware bundles. DJVU Ransomware is a type of malicious software that encrypts the files on an infected computer and demands a ransom payment in exchange for the decryption key. The STOP/DJVU Ransomware family is one of the most prevalent ransomware threats and is known for its aggressive tactics and high-pressure ransom demands.

Malware is delivered via cracked applications, fake set-up apps keygens, activators, and Windows updates. It does not utilize local information like keyboard layouts or timezone settings to prevent infecting victims in certain countries; instead, it uses the information returned by a request to https[:]//api.2ip.ua/geo.json. The card’s MAC address is utilized to provide unique identification for the system. This identity is provided to STOP’s command and control server, which responded with an RSA-2048 public key for encryption. Additional malware, including an information stealer known as Vidar, is then downloaded and installed.

ransom note

Impact

• Information theft
• Unauthorized Access

Indicators of Compromise

MD5

• e171a6f67e6d2531ec27ac40ce49d49d
• a9de6a2df4b11d3006fbfcfc961e2cdc
• 05682e60080a505040a6f4e7adf0d3f4

SHA-256

• 53305b35d4960f5de08205ef656f7432f8e58e5bc4cc736d8ca2f9af2282325b
• 4c9d370cf9769300e62391c4dfe4906d093e6419698e568457f9c65da0a6ef19
• 8d5d2fc3f0971d9ef5b8d02a8b2df4d9881b6a98a40cf3eb6705e7f2bf0e146b

SHA-1

• 222f0a903cefdbb3f3a91f2df68de4a183cba570
• 6d41d014029c3e8257c50492f819369076679fc8
• cdd2637acad3d61196c0d6af84a2e8e657b19ab2

Remediation

• Exercise caution when receiving messages from unknown senders.
• Block all threat indicators at your respective controls.
• Keep your software updated to the latest patches.
• Search for IOCs in your environment.