GreyEnergy

GreyEnergy is a backdoor written in C and compiled in Visual Studio. GreyEnergy shares similarities with the BlackEnergy malware and is thought to be the successor of it.[1]

ID: S0342
Type: MALWARE
Platforms: Windows
Version: 1.1
Created: 30 January 2019
Last Modified: 30 March 2020

Techniques Used

Domain ID Name Use
Enterprise T1071 .001 Application Layer Protocol: Web Protocols

GreyEnergy uses HTTP and HTTPS for C2 communications.[1]

Enterprise T1059 .003 Command and Scripting Interpreter: Windows Command Shell

GreyEnergy uses cmd.exe to execute itself in-memory.[1]

Enterprise T1543 .003 Create or Modify System Process: Windows Service

GreyEnergy chooses a service, drops a DLL file, and writes it to that serviceDLL Registry key.[1]

Enterprise T1573 .001 Encrypted Channel: Symmetric Cryptography

GreyEnergy encrypts communications using AES256.[1]

.002 Encrypted Channel: Asymmetric Cryptography

GreyEnergy encrypts communications using RSA-2048.[1]

Enterprise T1070 .004 Indicator Removal on Host: File Deletion

GreyEnergy can securely delete a file by hooking into the DeleteFileA and DeleteFileW functions in the Windows API.[1]

Enterprise T1105 Ingress Tool Transfer

GreyEnergy can download additional modules and payloads.[1]

Enterprise T1056 .001 Input Capture: Keylogging

GreyEnergy has a module to harvest pressed keystrokes.[1]

Enterprise T1112 Modify Registry

GreyEnergy modifies conditions in the Registry and adds keys.[1]

Enterprise T1027 Obfuscated Files or Information

GreyEnergy encrypts its configuration files with AES-256 and also encrypts its strings.[1]

.002 Software Packing

GreyEnergy is packed for obfuscation.[1]

Enterprise T1003 .001 OS Credential Dumping: LSASS Memory

GreyEnergy has a module for Mimikatz to collect Windows credentials from the victim’s machine.[1]

Enterprise T1055 .002 Process Injection: Portable Executable Injection

GreyEnergy has a module to inject a PE binary into a remote process.[1]

Enterprise T1090 .003 Proxy: Multi-hop Proxy

GreyEnergy has used Tor relays for Command and Control servers.[1]

Enterprise T1218 .011 Signed Binary Proxy Execution: Rundll32

GreyEnergy uses PsExec locally in order to execute rundll32.exe at the highest privileges (NTAUTHORITY\SYSTEM).[1]

Enterprise T1553 .002 Subvert Trust Controls: Code Signing

GreyEnergy digitally signs the malware with a code-signing certificate.[1]

Enterprise T1007 System Service Discovery

GreyEnergy enumerates all Windows services.[1]

References