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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
- 21538f81cb2524adfcfeb5d42f3118a4
- a16d996079ce9fb7ce671bdb144ec5de
SHA-256
- 9744518f376f023d3cb6c75b7022b01b41c8a384d36a5c3fdff8ae4233bbd128
- 8b6c01c19ea79de3c9133374c7d4cf34d75d717fdaf7a0c8d70b653c87b1de84
SHA-1
- 2b936cc4b463acb2cb4b0a0d0f76db7f6391a372
- 2ebf7a108b599268c15805c466a68a3a7a90f94e
Remediation
- Maintain cyber hygiene by updating your anti-virus software and implement 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.
- Block all threat indicators at your respective controls.
- Search for Indicator of compromise (IOCs) in your environment utilizing your respective security controls