Rewterz Threat Alert – Remcos RAT – Fresh IOCs

Severity

Medium

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

• f53b11a4a12f5bc26b12dfb56ee3f35e
• 94972e1370ad4c3e321804cef17571c2
• 5e9770c2b22b03e5726285900afab954
• e87c8450d5341b5057ee88b95581cf87
• a971816d5dafc580f32f3f6481757f0c

SHA-256

• 3bfc1578a54adf8fddb981d461ebc6f6d730fd7cfbf69bb1df421043210a26fb
• 1b7b3016fc40081b48b4fee22b7ea4cc5cc8fc65d3f74e54a29073dc1b7cae72
• ad3dc7a0c6ce33a7e45775b3452343eb748fab8823311df58d4599d6a203ff80
• 7dde2b2c43cf73df85a4712a0c10b5b76cae5b0f29ff5913ce10f24613edc895
• 43950f092deb41fbeea81df693331bd9328941abb3e3f27600a9d35b519eed3a

SHA1

• 53398cac5860fc249d1b0ab188a083d895a46a07
• ed8ea21cf1de27841e8f5f3c46a3dd5503d0f133
• 0be9416d3ca3ab36ffa1f2da9f3d20d4841bb468
• acda7453a1d8c9d737bc5cc699b237577fa074a1
• f6fe675fde2e1b4386a0754c835e885efc489a46

Remediation

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