Rewterz Threat Alert – DJVU Ransomware – Active IOCs

Severity

High

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. The STOP/DJVU ransomware is a Trojan that encrypts files. It infiltrates your computer invisibly and encrypts all of your data, making them unavailable to you. It leaves a ransom letter warning which demands money in exchange for decrypting your data and making them available to you again. 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.

Impact

• Information Theft
• File Encryption

Indicators of Compromise

MD5

b9e9cb1ab2cd3dc60a51a59f99bf7851
93e23e5bed552c0500856641d19729a8

SHA-256

a92515c734f901a064962cad84359bc1390248ec50b4fdae816862efb0d3ed9d
e4b23ebeb82594979325357ce20f14f70143d98ff49a9d5a2e6258fbfb33e555

SHA-1

4a2d4f4b5c16fc1068cc9ec8d7b29d6837770359
7e14cdf808dcd21d766a4054935c87c89c037445

Remediation

• Block all threat indicators at your respective controls.
• Search for IOCs in your environment.