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Rewterz Threat Alert – North Korean APT Kimsuky Aka Black Banshee – Active IOCs
January 16, 2023
Rewterz Threat Alert – STRRAT Malware – Active IOCs
January 16, 2023

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

January 16, 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

  • 2da6d4339db80838dc502db0b617cb73
  • c3c4435b50699bb1062d310cb3268dc9
  • 7ec63785f6337d7690ea8e107a1f1993

SHA-256

  • 8200ffefbaed4d91a44172a25273bfba65b0676c2f1045568d05a80cf4772825
  • cfb18dc520a776f2832382677964d5e035511a5109bea2faefaeca6e06bf51b0
  • 1224228040e2d2e6a74446f522379172684072aaa697483707b82653fe1c3cbb

SHA-1

  • 8ddff06b81d2730a5c0936b58fb09a152e2d344c
  • 60e1800bfeb224a061f9c82fbcb50bf4b12ee790
  • fb2463b62f1070d2c2fa2df0a9e23222b4596a0e

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
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      • Incident Analysis
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    • Tabletop Exercise
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