General

  • Target

    https://krampus.pages.dev/Krampus.rar

  • Sample

    241222-1jakhszmax

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1225264880039235738/46bNxRt60w9YjuGcjqkvDLT2Saa0gXhoe7P2-CbuUHwdxfwONEkNG92CHxRK6S67a3Bd

Targets

    • Target

      https://krampus.pages.dev/Krampus.rar

    • Detect Umbral payload

    • Umbral

      Umbral stealer is an opensource moduler stealer written in C#.

    • Umbral family

    • Command and Scripting Interpreter: PowerShell

      Using powershell.exe command.

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Event Triggered Execution: Component Object Model Hijacking

      Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies system executable filetype association

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Legitimate hosting services abused for malware hosting/C2

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

MITRE ATT&CK Enterprise v15

Tasks