FakeM is a shellcode-based Windows backdoor that has been used by Scarlet Mimic. [1]

ID: S0076
Platforms: Windows
Version: 1.1
Created: 31 May 2017
Last Modified: 27 March 2020

Techniques Used

Domain ID Name Use
Enterprise T1001 .003 Data Obfuscation: Protocol Impersonation

FakeM C2 traffic attempts to evade detection by resembling data generated by legitimate messenger applications, such as MSN and Yahoo! messengers. Additionally, some variants of FakeM use modified SSL code for communications back to C2 servers, making SSL decryption ineffective.[1]

Enterprise T1573 .001 Encrypted Channel: Symmetric Cryptography

The original variant of FakeM encrypts C2 traffic using a custom encryption cipher that uses an XOR key of "YHCRA" and bit rotation between each XOR operation. Some variants of FakeM use RC4 to encrypt C2 traffic.[1]

Enterprise T1056 .001 Input Capture: Keylogging

FakeM contains a keylogger module.[1]

Enterprise T1095 Non-Application Layer Protocol

Some variants of FakeM use SSL to communicate with C2 servers.[1]

Groups That Use This Software

ID Name References
G0029 Scarlet Mimic