General

  • Target

    upx.exe

  • Size

    231KB

  • Sample

    240920-mjrxxasbpq

  • MD5

    88b64c5cad0453a14347d415f9d4f82b

  • SHA1

    4a613e651418497885bf4861dc27fee379eee1b9

  • SHA256

    f7f74aeaf94b242f73f0417796f4814c1a857eaa246ebcb7a667643d90af938e

  • SHA512

    56775a3ce0c99998c0354a5d7485fbaf01e83f247412849abd2d81461decf0e9c4fa095d43e18be74fe7225df2b6cbbc2f98f4abf5611192ef66d83abee2d7d2

  • SSDEEP

    6144:bloZM+rIkd8g+EtXHkv/iD4irHJzZqStHY5rWWDIPb8e1m4i:5oZtL+EP8irHJzZqStHY5rWWD2y

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1286410156086657135/y7TF20aVqx76GuDRgjns3cJ12jus9sZ45Frb_eNyqMyI_5W9_y_ZNBROkZh10eJnySEN

Targets

    • Target

      upx.exe

    • Size

      231KB

    • MD5

      88b64c5cad0453a14347d415f9d4f82b

    • SHA1

      4a613e651418497885bf4861dc27fee379eee1b9

    • SHA256

      f7f74aeaf94b242f73f0417796f4814c1a857eaa246ebcb7a667643d90af938e

    • SHA512

      56775a3ce0c99998c0354a5d7485fbaf01e83f247412849abd2d81461decf0e9c4fa095d43e18be74fe7225df2b6cbbc2f98f4abf5611192ef66d83abee2d7d2

    • SSDEEP

      6144:bloZM+rIkd8g+EtXHkv/iD4irHJzZqStHY5rWWDIPb8e1m4i:5oZtL+EP8irHJzZqStHY5rWWD2y

    • Detect Umbral payload

    • Umbral

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

    • Credentials from Password Stores: Credentials from Web Browsers

      Malicious Access or copy of Web Browser Credential store.

    • 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