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Rewterz Threat Alert – Chaos Ransomware – Active IOCs
January 29, 2023
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
- cce7765c14bdcec1e907d013a875be01
- 376a3ccb90224d2ad5712bf04c0b9578
- 5b1d27c0cc55349def2cd69b3d33fdd9
- f2a5e61709415d155b3a251f5bae6a2f
- 82fddf18257b88127a7ec61e79a5208a
SHA-256
- 7cad4008315df2d44f08e54864e6605f0541117765d94e24a428f01c063a5c00
- 82399f5cd004a5ecbb9f9066a3d69907d61ca62927fcf5b4954e4e1efa7a7e4f
- 734319d59b4a37b534b9666226da4d97a7e4897bf605388909628012648730f0
- 58482d875ef132091f4c06b525e598b578187968455afecef479ee4eeaee80ef
- a85bf041904fde604bfc14bcdb4e75f50eedfdeb0ec8c34637819c13326dec6f
SHA-1
- 776c2ab297b6a69ce27041b748413bd25133030e
- 4272532e35baa6108e825b0e554b83e777bd1b3a
- 20e54017c0112e97fdf95c1d46801a5b6c0e5c2c
- 52b259d18e24b11d0d9bd4e6378c52b59ec86a68
- 3733c9040487eb9b815da7d6b0fac4c1ff47c297
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