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Analysis

  • max time kernel
    118s
  • max time network
    118s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    29/02/2024, 03:55

General

  • Target

    idk2.exe

  • Size

    235KB

  • MD5

    ce4b4e4821aba2f7ea9aad57e60f9c3c

  • SHA1

    1f01a2d44d06ced9373687ae061f81540fa1c015

  • SHA256

    8d612921eca9c96803b1057e860d2d3236869bd3658b01fb7f3402134bd0300c

  • SHA512

    727a3cc82dfdaede3fdcab6bd1a52794e90e3a41560345cc82212aaf75a00a09d63c753cf23b5318ad5b58126f29696bc4fbffac4f9ea1eee0af195712dae085

  • SSDEEP

    6144:waeJtRSyn/TlQ1VFmqGF3+re5d0KkJ4tWDwp:wNPT/xAVPWUG0KkrD

Score
10/10

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1205352570537775114/0TwopxZF8mZAIjdEowRHAiTqFbB8pjE6dzR2ST_E7pX5YXnZRcMh5QKMfo2QE94dAXKK

Signatures

  • Detect Umbral payload 2 IoCs
  • Umbral

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

  • Executes dropped EXE 1 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 42 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\idk2.exe
    "C:\Users\Admin\AppData\Local\Temp\idk2.exe"
    1⤵
    • Drops file in Windows directory
    • Suspicious use of WriteProcessMemory
    PID:1032
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGQAYwBhACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAHoAbABmACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHYAbQBnACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAHcAeQBzACMAPgA="
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1004
    • C:\Windows\Umbral.exe
      "C:\Windows\Umbral.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1664
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2700

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\Umbral.exe

    Filesize

    230KB

    MD5

    e57355d016f869b612bb5512bc9929da

    SHA1

    8d49a140dbe7ef50a1052bbb90514f84ff211daa

    SHA256

    516a9e91fdd13f05c4a8df291b9d2bb1571d5ce6223b883a6cae345cf0e75643

    SHA512

    4191df273c90a6e950bbae1931abe8d9e735ab9ff947fe0331664dcf8b96fdc50bb3436761d4e5ce190afd8a503ccad0fe2eb211b6af8a63aa6c6ae1bb7aee19

  • memory/1004-9-0x0000000074390000-0x000000007493B000-memory.dmp

    Filesize

    5.7MB

  • memory/1004-10-0x0000000002CF0000-0x0000000002D30000-memory.dmp

    Filesize

    256KB

  • memory/1004-11-0x0000000002CF0000-0x0000000002D30000-memory.dmp

    Filesize

    256KB

  • memory/1004-12-0x0000000074390000-0x000000007493B000-memory.dmp

    Filesize

    5.7MB

  • memory/1664-7-0x0000000000830000-0x0000000000870000-memory.dmp

    Filesize

    256KB

  • memory/1664-8-0x000007FEF5D70000-0x000007FEF675C000-memory.dmp

    Filesize

    9.9MB

  • memory/1664-13-0x000007FEF5D70000-0x000007FEF675C000-memory.dmp

    Filesize

    9.9MB