General

  • Target

    zzz.exe

  • Size

    227KB

  • Sample

    250222-by1mtavrcp

  • MD5

    45edc39982861c2c66ca275475a2b1b7

  • SHA1

    7cc1e53f8065fc7344351c33477a64e75283fbf9

  • SHA256

    03b53c8510e8b55a7b678839a8a49afc8951558e965fa6694357601ddb41b4e9

  • SHA512

    3f91eec3726d384570ff43dbc0dea43938f48e44eea8cf2f0aa04799bbf69f63eeb4c4d6e151dfbec733833526920b36e8a5bd8807395711cfbec3dfe92a0288

  • SSDEEP

    6144:+loZM9rIkd8g+EtXHkv/iD4751srRiK1qwBzOurl4b8e1mZi:ooZOL+EP8751srRiK1qwBzOur2b

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1342664527870824479/SnOAsYJqkmf4LrU15gBMfUNV8ydNA6Tv8ZP8OCg1Z6eOtXnSDmw3hpwaPKhrI3Ms10kr

Targets

    • Target

      zzz.exe

    • Size

      227KB

    • MD5

      45edc39982861c2c66ca275475a2b1b7

    • SHA1

      7cc1e53f8065fc7344351c33477a64e75283fbf9

    • SHA256

      03b53c8510e8b55a7b678839a8a49afc8951558e965fa6694357601ddb41b4e9

    • SHA512

      3f91eec3726d384570ff43dbc0dea43938f48e44eea8cf2f0aa04799bbf69f63eeb4c4d6e151dfbec733833526920b36e8a5bd8807395711cfbec3dfe92a0288

    • SSDEEP

      6144:+loZM9rIkd8g+EtXHkv/iD4751srRiK1qwBzOurl4b8e1mZi:ooZOL+EP8751srRiK1qwBzOur2b

    • Detect Umbral payload

    • Umbral

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

    • Umbral family

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Command and Scripting Interpreter: PowerShell

      Using powershell.exe command.

    • Drops file in Drivers directory

    • Deletes itself

    • Reads user/profile data of web browsers

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

    • 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