Analysis

  • max time kernel
    50s
  • max time network
    59s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-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
  • umbral

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

Extracted

Family
  • xworm

C2
  • web-amend.gl.at.ply.gg:59501

Attributes
  • Install_directory

    %Userprofile%

  • install_file

    USB.exe

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
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 52 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:420
    • 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:4300
    • 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:4856
      • 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:2600
      • 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
        • Suspicious use of AdjustPrivilegeToken
        PID:2120
      • 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
        • Suspicious use of AdjustPrivilegeToken
        PID:1264
      • 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
        • Suspicious use of AdjustPrivilegeToken
        PID:2292
      • 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:828
      • C:\Windows\SYSTEM32\shutdown.exe
        shutdown.exe /f /s /t 0
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:4560
    • 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:1200
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1256
  • C:\Users\Admin\RuntimeBroker
    C:\Users\Admin\RuntimeBroker
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:1564
  • C:\Windows\system32\LogonUI.exe
    "LogonUI.exe" /flags:0x4 /state0:0xa3a15855 /state1:0x41c64e6d
    1⤵
    • Modifies data under HKEY_USERS
    • Suspicious use of SetWindowsHookEx
    PID:2536

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        powershell.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
        • Size 2KB
        • SHA256 85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c
        • MD5 SHA1 SHA512

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 944B
        • SHA256 9cf18d157a858fc143a6de5c2dd3f618516a527b34478ac478d8c94ff027b0d2
        • MD5 SHA1 SHA512

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 944B
        • SHA256 4bb861850395dcc3bec4691e8b9f0fa733b8a2d568d460a9201d65250b12fee1
        • MD5 SHA1 SHA512

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 944B
        • SHA256 83387ce468d717a7b4ba238af2273da873b731a13cc35604f775a31fa0ac70ea
        • MD5 SHA1 SHA512

        __PSScriptPolicyTest_2nuobe5g.skl.ps1

        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2nuobe5g.skl.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • 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/420-0-0x00007FFB3B213000-0x00007FFB3B215000-memory.dmp

        memory/420-1-0x0000000000D60000-0x0000000000E84000-memory.dmp

        memory/1200-37-0x000002054A6F0000-0x000002054A730000-memory.dmp

        memory/2600-49-0x000001C7F7230000-0x000001C7F7252000-memory.dmp

        memory/4300-43-0x0000000008640000-0x000000000864E000-memory.dmp

        memory/4300-42-0x0000000008B60000-0x0000000008B98000-memory.dmp

        memory/4300-39-0x00000000009B0000-0x0000000000A86000-memory.dmp

        memory/4856-36-0x0000000000ED0000-0x0000000000EEA000-memory.dmp

        memory/4856-38-0x00007FFB3B210000-0x00007FFB3BCD2000-memory.dmp

        memory/4856-89-0x00007FFB3B210000-0x00007FFB3BCD2000-memory.dmp

        memory/4856-93-0x00007FFB3B210000-0x00007FFB3BCD2000-memory.dmp