June 4, 2025
Proactive Defense: The Importance of Incident Response Planning in Cybersecurity
800K University System of Georgia Individuals Exposed in 2023 MOVEit Breach
May 9, 2024North Korean APT Kimsuky Aka Black Banshee – Active IOCs
May 10, 2024800K University System of Georgia Individuals Exposed in 2023 MOVEit Breach
May 9, 2024North Korean APT Kimsuky Aka Black Banshee – Active IOCs
May 10, 2024
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. DJVU Ransomware is a type of malicious software that encrypts 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 app 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. 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 responds 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
- File Encryption
Indicators of Compromise
MD5
- 52b46078a3be79bff167c356d8fe8b6f
- 029f0e789f5b8d0b3f519b5bb9102754
SHA-256
- 6cc34e9f89b0a88a68f20cd3b5e894e0015fc513cdd0d8112b422b893bbbb506
- 110eedf789feeb746b14dfc2d1a93aa580dfa110a4cb3073ce4d9460de5309cf
SHA1
- f108c0ef38d6b4f99248f4ee6e129645a688551d
- 51752b151911083df2f34fde4ae2aaf91de5e930
URL
- http://cajgtus.com/lancer/get.php
Remediation
- Block all threat indicators at your respective controls.
- Search for indicators of compromise (IOCs) in your environment utilizing your respective security controls.
- Maintain cyber hygiene by updating your anti-virus software and implementing a patch management lifecycle.
- Maintain Offline Backups - In a ransomware attack, the adversary will often delete or encrypt backups if they have access to them. That’s why it’s important to keep offline (preferably off-site), encrypted backups of data and test them regularly.
- Emails from unknown senders should always be treated with caution.
- Never trust or open links and attachments received from unknown sources/senders.
