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Severity
Medium
Analysis Summary
Remcos or Remote Control and Surveillance, marketed as a legitimate software by a Germany-based firm Breaking Security for remotely managing Windows systems are 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 Spam Email 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 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
- 83d5b25a4413fbf2460d42d4ba6adee2
- ae30602300981c0dfe3dc1c0312b565f
- feffb58a45fc38406a1eb94b02191d2c
SHA-256
- 5773fd214b8cb2cbc8a3ad95f4ab9cfadf011c4a823e1cfbb389b1bc1852f081
- ebe0b8890392475537625aeefaec22b5f0115011e135117d7afd9325eb47fad8
- 887ec460c59bb6e902dc8915ab3e006538ba0d1fabe9793736da4405170b64b2
- a0fd8f81cda85af9221734e97a18c29c25a53020517d507ada3e3a1681036e54
SHA1
7983c391402adceefa13970da43cf2447827486f
f6d3580857825b3bd0f7155998647f4ba36fdd6e
4454f3b90242670b1fb8ea62ab545a7ea94fcc1a
Remediation
- Block all threat indicators at their respective controls.
- Search for IOCs in your environment.