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Rewterz Threat Alert – Remcos RAT – Active IOCs

Severity

High

Analysis Summary

Remcos Remote Control and Surveillance, marketed as a legitimate software by a Germany-based firm Breaking Security for remotely managing Windows systems is now widely used in multiple malicious campaigns by threat actors. Remcos RAT is a sophisticated remote access Trojan (RAT) that can be used to fully control and monitor any Windows computer from XP and onwards. The current campaign utilizes social engineering techniques wherein threat actors are leveraging what’s new and trending worldwide. The phishing email contains a PDF offering CoronaVirus safety measures but in reality, this PDF includes an executable for a REMCOS RAT dropper that runs together with a VBS file executing the malware. The malware also adds the Startup registry key at “HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce” for it to become persistent while the device affected has been restarted.
This Backdoor gathers the following information and sends it to its servers:

  • Computer Information (OS version, computer name, system type, product name, primary adapter)
  • User information (user access, user profile, user name, user domain)
  • Processor information (processor revision number, processor level, processor identifier, processor architecture),

Impact

  • Breach of: Victim’s machine information (OS version, computer name, system type, product name, primary adapter).
  • User information (user access, user profile, user name, user domain)
  • Processor information (processor revision number, processor level, processor identifier, processor architecture)

Indicators of Compromise

MD5

  • 954737e35b988d79f9dc7a81597c8d37
  • 64854e08792b761b973556cdf1522f26

SHA-256

  • 78900ed7307ae31ad9b74204fd8e4798b01a6b7bc593e70d4a7aaab7ab1b2b95
  • c264b40c7308aad3df416c750c64a5fb80540095ac725002686dd25c4dbf2b17

SHA-1

  • 48e8376824041a18108c4df61970301fab5e6f8f
  • 851cd539768c26b407e3ba8cc75d87ed1dd8423d

Remediation

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

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