Analysis

  • max time kernel
    133s
  • max time network
    138s
  • 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, 07:25

General

  • Target
    RustAnticheat.exe
  • Size 1.1MB
  • Sample240925-h9fv4ssflp
  • 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 5 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.

  • Delays execution with timeout.exe 1 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 1 IoCs
  • Suspicious use of WriteProcessMemory 25 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:1888
    • 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:2472
    • 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:1280
      • 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:1396
      • 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:1768
      • 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:316
      • 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:2300
      • 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:1720
      • C:\Windows\System32\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /delete /f /tn "RuntimeBroker"
        3⤵
          PID:820
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3D9C.tmp.bat""
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:4188
          • C:\Windows\system32\timeout.exe
            timeout 3
            4⤵
            • Delays execution with timeout.exe
            PID:2580
      • 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:3560
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:5012
    • C:\Users\Admin\RuntimeBroker
      C:\Users\Admin\RuntimeBroker
      1⤵
      • Executes dropped EXE
      PID:3376
    • C:\Users\Admin\RuntimeBroker
      C:\Users\Admin\RuntimeBroker
      1⤵
      • Executes dropped EXE
      PID:4960

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          RuntimeBroker.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RuntimeBroker.log
          • Size 654B
          • SHA256 87ba77c13905298acbac72be90949c4fe0755b6eff9777615aa37f252515f151
          • MD5 SHA1 SHA512

          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 32b6311d19186ef7ddce70d92c35ae8e036982ae4d3f2e5fd84c706ee758136f
          • MD5 SHA1 SHA512

          StartupProfileData-NonInteractive

          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
          • Size 1KB
          • SHA256 61937d8bd9442a70272441b33a475a7f5b1f2a3dd92558588f93b5990443e5a1
          • MD5 SHA1 SHA512

          StartupProfileData-NonInteractive

          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
          • Size 1KB
          • SHA256 197dbbfaab543651c8b914b63ed906cb2eacd9dcdb7eb96b58fbf0252d4a9dcd
          • MD5 SHA1 SHA512

          __PSScriptPolicyTest_qsgvk3eu.vl4.ps1

          • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qsgvk3eu.vl4.ps1
          • Size 1B
          • SHA256 6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b
          • MD5 SHA1 SHA512

          tmp3D9C.tmp.bat

          • Path C:\Users\Admin\AppData\Local\Temp\tmp3D9C.tmp.bat
          • Size 162B
          • SHA256 a17a28e8995f9ba3da368a8a7e26604477bf411659de91faebc64cd90a789c19
          • 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/1280-19-0x00000000008C0000-0x00000000008DA000-memory.dmp

          memory/1396-31-0x0000019C32710000-0x0000019C32732000-memory.dmp

          memory/1396-34-0x0000019C32840000-0x0000019C328B6000-memory.dmp

          memory/1888-0-0x00007FFD7C7F3000-0x00007FFD7C7F4000-memory.dmp

          memory/1888-1-0x0000000000960000-0x0000000000A84000-memory.dmp

          memory/2472-20-0x0000000000D80000-0x0000000000E56000-memory.dmp

          memory/2472-22-0x00000000735CE000-0x00000000735CF000-memory.dmp

          memory/2472-26-0x0000000009280000-0x00000000092B8000-memory.dmp

          memory/3560-18-0x0000014B88B40000-0x0000014B88B80000-memory.dmp

          memory/3560-24-0x00007FFD7C7F0000-0x00007FFD7D1DC000-memory.dmp

          memory/3560-21-0x00007FFD7C7F0000-0x00007FFD7D1DC000-memory.dmp