General

  • Target

    https://mega.nz/file/VPNhzQ6T#rJlMaWgUDtOlnXZQY15sJ-NnSS2mPSSUDRMIwEr5_mc

  • Sample

    240718-nd39esyhld

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1263163627955818638/O6H0XtkfVMlzt1CR2LtuxnT8hf_eK3rxCg4Z8Ho7QTiBTbC3moAh35BYkmVLUE-l4NEA

Targets

    • Target

      https://mega.nz/file/VPNhzQ6T#rJlMaWgUDtOlnXZQY15sJ-NnSS2mPSSUDRMIwEr5_mc

    • Detect Umbral payload

    • Modifies Windows Defender Real-time Protection settings

    • Modifies security service

    • Umbral

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

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Command and Scripting Interpreter: PowerShell

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

    • Drops file in Drivers directory

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Drops startup file

    • Executes dropped EXE

    • Reads user/profile data of web browsers

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

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • 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.

    • Suspicious use of NtSetInformationThreadHideFromDebugger

MITRE ATT&CK Enterprise v15

Tasks