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SMOKEDHAM

SMOKEDHAM is a Powershell-based .NET backdoor that was first reported in May 2021; it has been used by at least one ransomware-as-a-service affiliate.[1][2]

ID: S0649
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Type: MALWARE
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Platforms: Windows
Version: 1.0
Created: 22 September 2021
Last Modified: 14 October 2021
Enterprise Layer
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Techniques Used

Domain ID Name Use
Enterprise T1087 .001 Account Discovery: Local Account

SMOKEDHAM has used net.exe user and net.exe users to enumerate local accounts on a compromised host.[2]
Enterprise T1098 Account Manipulation

SMOKEDHAM has added created user accounts to local Admin groups.[2]
Enterprise T1071 .001 Application Layer Protocol: Web Protocols

SMOKEDHAM has communicated with its C2 servers via HTTPS and HTTP POST requests.[2]
Enterprise T1547 .001 Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder

SMOKEDHAM has used reg.exe to create a Registry Run key.[2]
Enterprise T1059 .001 Command and Scripting Interpreter: PowerShell

SMOKEDHAM can execute Powershell commands sent from its C2 server.[2]
Enterprise T1136 .001 Create Account: Local Account

SMOKEDHAM has created user accounts and added them to local Admin groups.[2]
Enterprise T1132 .001 Data Encoding: Standard Encoding

SMOKEDHAM has encoded its C2 traffic with Base64.[2]
Enterprise T1573 .001 Encrypted Channel: Symmetric Cryptography

SMOKEDHAM has encrypted its C2 traffic with RC4.[2]
Enterprise T1041 Exfiltration Over C2 Channel

SMOKEDHAM has exfiltrated data to its C2 server.[2]
Enterprise T1564 .002 Hide Artifacts: Hidden Users

SMOKEDHAM has modified the Registry to hide created user accounts from the Windows logon screen. [2]
Enterprise T1105 Ingress Tool Transfer

SMOKEDHAM has used Powershell to download UltraVNC and Ngrok from third-party file sharing sites.[2]
Enterprise T1056 .001 Input Capture: Keylogging

SMOKEDHAM can continuously capture keystrokes.[1][2]
Enterprise T1112 Modify Registry

SMOKEDHAM has modified registry keys for persistence, to enable credential caching for credential access, and to facilitate lateral movement via RDP.[2]
Enterprise T1027 Obfuscated Files or Information

The SMOKEDHAM source code is embedded in the dropper as an encrypted string.[2]
Enterprise T1598 .003 Phishing for Information: Spearphishing Link

SMOKEDHAM has been delivered via malicious links in phishing emails.[1]
Enterprise T1090 .004 Proxy: Domain Fronting

SMOKEDHAM has used a fronted domain to obfuscate its hard-coded C2 server domain.[2]
Enterprise T1113 Screen Capture

SMOKEDHAM can capture screenshots of the victim’s desktop.[1][2]
Enterprise T1082 System Information Discovery

SMOKEDHAM has used the systeminfo command on a compromised host.[2]
Enterprise T1033 System Owner/User Discovery

SMOKEDHAM has used whoami commands to identify system owners.[2]
Enterprise T1204 .001 User Execution: Malicious Link

SMOKEDHAM has relied upon users clicking on a malicious link delivered through phishing.[1]
Enterprise T1102 Web Service

SMOKEDHAM has used Google Drive and Dropbox to host files downloaded by victims via malicious links.[1]

References

  1. FireEye. (2021, May 11). Shining a Light on DARKSIDE Ransomware Operations. Retrieved September 22, 2021.
  1. FireEye. (2021, June 16). Smoking Out a DARKSIDE Affiliate’s Supply Chain Software Compromise. Retrieved September 22, 2021.