Analysis

  • max time kernel
    50s
  • max time network
    59s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
  • submitted
    25/09/2024, 07:30

Errors

Reason
Machine shutdown

General

  • Target
    RustAnticheat.exe
  • Size 1.1MB
  • Sample240925-jb265awbpc
  • SHA256 20868115f180702553380c551df502535b8aa01c3ef630d408edd849896e631a
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • xworm

C2
  • web-amend.gl.at.ply.gg:59501

Attributes
  • Install_directory

    %Userprofile%

  • install_file

    USB.exe

Extracted

Family
  • umbral

C2
  • https://discord.com/api/webhooks/1288399761308782603/dBc32ufL91AjkI32Qso8IT_vaA0Frj3MP9_ivfjpfIEs4tXDc5SB89aA7LHc09xTZHZv

Signatures

  • Detect Umbral payload 2 IoCs
  • Detect Xworm Payload 2 IoCs
  • Umbral

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

  • Xworm

    Xworm is a remote access trojan written in C#.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

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

  • Drops startup file 2 IoCs
  • Executes dropped EXE 4 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies data under HKEY_USERS 15 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 13 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\RustAnticheat.exe
    "C:\Users\Admin\AppData\Local\Temp\RustAnticheat.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2584
    • C:\Users\Admin\AppData\Roaming\Loader (1).exe
      "C:\Users\Admin\AppData\Roaming\Loader (1).exe"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      PID:2784
    • C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe
      "C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2740
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3856
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        PID:2868
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\RuntimeBroker'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        PID:4924
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        PID:4120
      • C:\Windows\System32\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "RuntimeBroker" /tr "C:\Users\Admin\RuntimeBroker"
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:912
      • C:\Windows\SYSTEM32\shutdown.exe
        shutdown.exe /f /s /t 0
        3⤵
          PID:4004
      • C:\Users\Admin\AppData\Roaming\Litvin.exe
        "C:\Users\Admin\AppData\Roaming\Litvin.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1668
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:3640
    • C:\Users\Admin\RuntimeBroker
      C:\Users\Admin\RuntimeBroker
      1⤵
      • Executes dropped EXE
      PID:4472
    • C:\Windows\system32\LogonUI.exe
      "LogonUI.exe" /flags:0x0 /state0:0xa3aeb055 /state1:0x41c64e6d
      1⤵
      • Modifies data under HKEY_USERS
      • Suspicious use of SetWindowsHookEx
      PID:440

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          powershell.exe.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
          • Size 3KB
          • SHA256 fdd7d9def6f9f0c0f2e60dbc8a2d1999071cd7d3095e9e087bb1cda7a614ac3c
          • MD5 SHA1 SHA512

          StartupProfileData-NonInteractive

          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
          • Size 1KB
          • SHA256 142e5386fdc4c0ee8bbb6aadba00215dcabfa239a9513877dccbd521fc398611
          • MD5 SHA1 SHA512

          StartupProfileData-NonInteractive

          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
          • Size 1KB
          • SHA256 b492c2e2b1f540dc2275365254e5056ba3acde2f3bc01db5e60671e63297ad66
          • MD5 SHA1 SHA512

          StartupProfileData-NonInteractive

          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
          • Size 1KB
          • SHA256 c935fdd0fd0bf5e55e3944f47f15b77d686a61d3a4e5958f77b3117d477dda87
          • MD5 SHA1 SHA512

          __PSScriptPolicyTest_bgrsvplq.0f3.ps1

          • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_bgrsvplq.0f3.ps1
          • Size 1B
          • SHA256 6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b
          • MD5 SHA1 SHA512

          Litvin.exe

          • Path C:\Users\Admin\AppData\Roaming\Litvin.exe
          • Size 229KB
          • SHA256 91fd2cdc10b62a3aa10837c50c9dd2958f58a7c6feb6a5d29f73c5edca033999
          • MD5 SHA1 SHA512 SSDEEP

          Loader (1).exe

          • Path C:\Users\Admin\AppData\Roaming\Loader (1).exe
          • Size 827KB
          • SHA256 677aeb1981c58cba41a5d53ccbbf5b471e62dc49dc326570767da940560d840d
          • MD5 SHA1 SHA512 SSDEEP

          RuntimeBroker.exe

          • Path C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe
          • Size 77KB
          • SHA256 f84e5ceb6d0c53993bf5139e7e58dcc06c8cc7d6bc1e5e97171445f6fe01109d
          • MD5 SHA1 SHA512 SSDEEP

          memory/1668-19-0x0000021655B00000-0x0000021655B40000-memory.dmp

          memory/2584-0-0x00007FFD204C3000-0x00007FFD204C4000-memory.dmp

          memory/2584-1-0x0000000000010000-0x0000000000134000-memory.dmp

          memory/2740-15-0x00000000004A0000-0x00000000004BA000-memory.dmp

          memory/2740-20-0x00007FFD204C0000-0x00007FFD20EAC000-memory.dmp

          memory/2740-203-0x00007FFD204C0000-0x00007FFD20EAC000-memory.dmp

          memory/2740-207-0x00007FFD204C0000-0x00007FFD20EAC000-memory.dmp

          memory/2784-24-0x0000000008840000-0x0000000008878000-memory.dmp

          memory/2784-21-0x0000000000340000-0x0000000000416000-memory.dmp

          memory/3856-29-0x000002BE44EE0000-0x000002BE44F02000-memory.dmp

          memory/3856-32-0x000002BE45090000-0x000002BE45106000-memory.dmp