Extracted

• • Target

    Client1.exe

  • Size

    747KB

  • MD5

    c8d8bf0cef0eb986664a7653b30062b6

  • SHA1

    da1957c3bcd76a71d8182fd42a677e5aeaf76cde

  • SHA256

    e3b98f944dd0cf41f0955cbc2b8858d249a39f69568ea82286d14e20d8e9c910

  • SHA512

    34278aee895a03cd76b56278c5b362aa013d83f8be355fd5fdac442e19eaf5a60477f317cdeac157ba69785661866ff41d6051c1cb40ecb473c2814c5d0c672a

  • SSDEEP

    12288:+cWW/gSKBvPVle8c6bn3VG0jMRxPjT90n/4mhBE:+CNEVXePjT90ww

  Score

  10^/10

  umbralbootkitevasionexecutionpersistencespywarestealer

  • Detect Umbral payload

  • Modifies WinLogon for persistence

    persistence

  • Umbral

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

    stealerumbral

  • Command and Scripting Interpreter: PowerShell

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

    execution

  • Disables Task Manager via registry modification

    evasion

  • Disables cmd.exe use via registry modification

    evasion

  • Drops file in Drivers directory

  • Modifies AppInit DLL entries

    persistence

  • Checks computer location settings

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE

  • Loads dropped DLL

  • Reads user/profile data of web browsers

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

    spywarestealer

  • Adds Run key to start application

    persistence

  • Enumerates connected drives

    Attempts to read the root path of hard drives other than the default C: drive.

  • 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.

  • Writes to the Master Boot Record (MBR)

    Bootkits write to the MBR to gain persistence at a level below the operating system.

    bootkitpersistence
  behavioral1