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Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20241010-en
  • resource tags

    arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
  • submitted
    03/01/2025, 16:25

General

  • Target

    RustAnticheat.exe

  • Size

    1.1MB

  • MD5

    2fbbfbb74dc5aaadcfd211cfeffe2436

  • SHA1

    fabe364aa9a454fd4222a65208cc6e0ea20a055b

  • SHA256

    20f227a3b9bb4366e5f33adc724f6bfe729148984dc320985a306099b9fa2f81

  • SHA512

    f10ccf004653b8e8a05168b7045fd14247ca4d2e5d4917990129f5e9d0b8b3404bf19ae551e2cab3aaf0808d968c178b5b9b41df6e4527e11d8a3d2ab5e438ca

  • SSDEEP

    24576:Ubgge3IgtiIefG+2xzN0Vx0Pn+ugXDHonXKmbolhyr9hv3V:Ue3IgwqJCfBrLo6mbolhq3V

Malware Config

Extracted

Family

xworm

C2

say-bands.gl.at.ply.gg:41697

Attributes
  • Install_directory

    %Userprofile%

  • install_file

    RuntimeBroker.exe

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1324773241721454592/0bNkfJfnFLKYK9qsZKNX46VZrdz9_Q66rDPONU09Nh8_1RKAs7tIVY9WGoMFggyLSmFd

Signatures

  • Detect Umbral payload 2 IoCs
  • Detect Xworm Payload 4 IoCs
  • Umbral

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

  • Umbral family
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Xworm family
  • Command and Scripting Interpreter: PowerShell 1 TTPs 8 IoCs

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

  • Drops file in Drivers directory 1 IoCs
  • Drops startup file 2 IoCs
  • Executes dropped EXE 6 IoCs
  • Reads user/profile data of web browsers 3 TTPs

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 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.

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Runs ping.exe 1 TTPs 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 11 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 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.

  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\RustAnticheat.exe
    "C:\Users\Admin\AppData\Local\Temp\RustAnticheat.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2304
    • 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:2968
    • C:\Users\Admin\AppData\Roaming\RustCheack.exe
      "C:\Users\Admin\AppData\Roaming\RustCheack.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:3012
      • 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\RustCheack.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2700
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RustCheack.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1772
      • 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.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1084
      • 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:1732
      • 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.exe"
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:1712
    • C:\Users\Admin\AppData\Roaming\Umbral.exe
      "C:\Users\Admin\AppData\Roaming\Umbral.exe"
      2⤵
      • Drops file in Drivers directory
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2724
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2312
      • C:\Windows\system32\attrib.exe
        "attrib.exe" +h +s "C:\Users\Admin\AppData\Roaming\Umbral.exe"
        3⤵
        • Views/modifies file attributes
        PID:2940
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\Umbral.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2508
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 2
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2412
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:996
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1020
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" os get Caption
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1852
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" computersystem get totalphysicalmemory
        3⤵
          PID:1672
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          3⤵
            PID:3008
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
            3⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            PID:2136
          • C:\Windows\System32\Wbem\wmic.exe
            "wmic" path win32_VideoController get name
            3⤵
            • Detects videocard installed
            PID:2500
          • C:\Windows\system32\cmd.exe
            "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Roaming\Umbral.exe" && pause
            3⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            PID:2956
            • C:\Windows\system32\PING.EXE
              ping localhost
              4⤵
              • System Network Configuration Discovery: Internet Connection Discovery
              • Runs ping.exe
              PID:2292
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {D2A2F89D-1F8E-4681-965B-A600106464D1} S-1-5-21-3692679935-4019334568-335155002-1000:BCXRJFKE\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:684
        • C:\Users\Admin\RuntimeBroker.exe
          C:\Users\Admin\RuntimeBroker.exe
          2⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:2392
        • C:\Users\Admin\RuntimeBroker.exe
          C:\Users\Admin\RuntimeBroker.exe
          2⤵
          • Executes dropped EXE
          PID:2504
        • C:\Users\Admin\RuntimeBroker.exe
          C:\Users\Admin\RuntimeBroker.exe
          2⤵
          • Executes dropped EXE
          PID:2512

      Network

      MITRE ATT&CK Enterprise v15

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      Downloads

      • C:\Users\Admin\AppData\Roaming\Loader (1).exe

        Filesize

        827KB

        MD5

        eefb801774c5ccb44153268a9357f5f1

        SHA1

        b1906b22e14edd142c52808ab3e5ba9346b85de5

        SHA256

        677aeb1981c58cba41a5d53ccbbf5b471e62dc49dc326570767da940560d840d

        SHA512

        1cf162fe6184d68dca514059d2de1123e80d0faac401765a54224aa5a987c9454bc92263fbec566835aa7b402f1f63ba59bb425ccc139e0a7391e66991f270b7

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

        Filesize

        7KB

        MD5

        e4c7785b514e39d713f40a7856fc8890

        SHA1

        cfd7c6c0d0b2674d27c1e58348f3db2aff6635ce

        SHA256

        cc9fb4ce237c9e6be187e93b15ae71efbacabbfd698477ccbdb00c52f0ae5bb8

        SHA512

        df7c95d820fddd3977f2bbc06ae69a2090911f29f98ee5e9215f486771492451d87d973d57db9b65372e44ae038f1b227406e488352e1baebbaaeebd67853465

      • C:\Users\Admin\AppData\Roaming\RustCheack.exe

        Filesize

        77KB

        MD5

        aa503a26fcb9e14b90e0e6913ec68957

        SHA1

        678629ebaa7ec15ce726c28b4a9596427b0f29a5

        SHA256

        86d4817a7af82350e9cde59d0938a797d762abdd3f9d1bf2d47d4008fecbc2a5

        SHA512

        19db8b42492fbed5968c1083672cbc31faa60f44d64a19ed608e3602bb413573e9834d4e92db6ee324f43f48001e1b89f6dd3c935ae10e7e2be8107996583440

      • C:\Users\Admin\AppData\Roaming\Umbral.exe

        Filesize

        232KB

        MD5

        c1e4b555821d2cd22adc1f4bd409aac3

        SHA1

        d18aa95ed3dc98ce3981708ff1b16e4979e543d3

        SHA256

        563fc2d2f357a3ecd5c194fdba4f64b9c01b24cdc38c6c50c6b46c72ccab66a4

        SHA512

        57c5bf37a28b19677d3ae01eb1b4766e268966686ab44f830c85763308ed9cc530f73b45ec8ebff6bdfa4f905c77439e1044e86e714b117feaed6aef0b9c3de4

      • memory/996-74-0x000000001B2B0000-0x000000001B592000-memory.dmp

        Filesize

        2.9MB

      • memory/996-75-0x0000000001E60000-0x0000000001E68000-memory.dmp

        Filesize

        32KB

      • memory/1020-86-0x000000001B4B0000-0x000000001B792000-memory.dmp

        Filesize

        2.9MB

      • memory/1772-35-0x000000001B3E0000-0x000000001B6C2000-memory.dmp

        Filesize

        2.9MB

      • memory/1772-36-0x00000000023F0000-0x00000000023F8000-memory.dmp

        Filesize

        32KB

      • memory/2136-102-0x0000000002490000-0x0000000002498000-memory.dmp

        Filesize

        32KB

      • memory/2136-101-0x000000001B1B0000-0x000000001B492000-memory.dmp

        Filesize

        2.9MB

      • memory/2304-1-0x0000000000240000-0x0000000000364000-memory.dmp

        Filesize

        1.1MB

      • memory/2304-0-0x000007FEF5F03000-0x000007FEF5F04000-memory.dmp

        Filesize

        4KB

      • memory/2392-95-0x0000000000DB0000-0x0000000000DCA000-memory.dmp

        Filesize

        104KB

      • memory/2412-53-0x000000001B1C0000-0x000000001B4A2000-memory.dmp

        Filesize

        2.9MB

      • memory/2504-109-0x0000000001310000-0x000000000132A000-memory.dmp

        Filesize

        104KB

      • memory/2508-42-0x0000000002570000-0x0000000002578000-memory.dmp

        Filesize

        32KB

      • memory/2700-29-0x0000000002650000-0x0000000002658000-memory.dmp

        Filesize

        32KB

      • memory/2700-28-0x000000001B3E0000-0x000000001B6C2000-memory.dmp

        Filesize

        2.9MB

      • memory/2724-19-0x0000000001000000-0x0000000001040000-memory.dmp

        Filesize

        256KB

      • memory/2968-80-0x0000000000400000-0x000000000040A000-memory.dmp

        Filesize

        40KB

      • memory/2968-21-0x0000000000400000-0x000000000040A000-memory.dmp

        Filesize

        40KB

      • memory/2968-22-0x0000000000400000-0x000000000040A000-memory.dmp

        Filesize

        40KB

      • memory/2968-20-0x0000000001370000-0x0000000001446000-memory.dmp

        Filesize

        856KB

      • memory/3012-17-0x0000000001110000-0x000000000112A000-memory.dmp

        Filesize

        104KB