Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-12-2024 22:09

General

  • Target

    2021A9779C45F35A46B1B28F2E9136FA.exe

  • Size

    2.8MB

  • MD5

    2021a9779c45f35a46b1b28f2e9136fa

  • SHA1

    76e03dfcc8732388fad4fd83b72b34cad50786ca

  • SHA256

    c8ea81ec0afa16e1e7c0bc325396be024c993479765a9e4ad26b29d83bbfb01a

  • SHA512

    5fc1617b672c308df2116cbfcd08e6d6b1c4969c3399dd9eb4c6d12a08bac23ac897c76de20cb1730fe44b50cf2bb840b11332f01f016ca1d4d6ab1bbdd19116

  • SSDEEP

    49152:7CFujkASUPVAIsINt8BCt3GSHBZTz0uBHTNS/lhv+8PUkYH4j:GFixPV9s4CqWQbzB+dc8BJj

Malware Config

Signatures

  • DcRat

    DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

  • Dcrat family
  • Process spawned unexpected child process 6 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

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

  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs
  • System policy modification 1 TTPs 6 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\2021A9779C45F35A46B1B28F2E9136FA.exe
    "C:\Users\Admin\AppData\Local\Temp\2021A9779C45F35A46B1B28F2E9136FA.exe"
    1⤵
    • UAC bypass
    • Checks computer location settings
    • Checks whether UAC is enabled
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:4744
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\2021A9779C45F35A46B1B28F2E9136FA.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1636
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\appcompat\Programs\RuntimeBroker.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1620
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\taskhostw.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3556
    • C:\Windows\appcompat\Programs\RuntimeBroker.exe
      "C:\Windows\appcompat\Programs\RuntimeBroker.exe"
      2⤵
      • UAC bypass
      • Checks computer location settings
      • Executes dropped EXE
      • Checks whether UAC is enabled
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:4460
      • C:\Windows\System32\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\8c0200b8-c64e-4ccd-81c7-bcc27a7a7687.vbs"
        3⤵
          PID:2508
        • C:\Windows\System32\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\3e66b920-77fb-457f-94ac-bb78d5ae805c.vbs"
          3⤵
            PID:4412
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Windows\appcompat\Programs\RuntimeBroker.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:3360
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\appcompat\Programs\RuntimeBroker.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2020
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Windows\appcompat\Programs\RuntimeBroker.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:3204
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\taskhostw.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1492
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Users\Admin\taskhostw.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1260
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 9 /tr "'C:\Users\Admin\taskhostw.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2912
      • C:\Windows\system32\wbem\WmiApSrv.exe
        C:\Windows\system32\wbem\WmiApSrv.exe
        1⤵
          PID:4776

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

          Filesize

          2KB

          MD5

          d85ba6ff808d9e5444a4b369f5bc2730

          SHA1

          31aa9d96590fff6981b315e0b391b575e4c0804a

          SHA256

          84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

          SHA512

          8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

        • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

          Filesize

          944B

          MD5

          6d3e9c29fe44e90aae6ed30ccf799ca8

          SHA1

          c7974ef72264bbdf13a2793ccf1aed11bc565dce

          SHA256

          2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

          SHA512

          60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

        • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

          Filesize

          944B

          MD5

          6d42b6da621e8df5674e26b799c8e2aa

          SHA1

          ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

          SHA256

          5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

          SHA512

          53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

        • C:\Users\Admin\AppData\Local\Temp\3e66b920-77fb-457f-94ac-bb78d5ae805c.vbs

          Filesize

          499B

          MD5

          c54c39ad12712f167a5c88df4fd97e58

          SHA1

          0d9439fb87b826aafc1710f724a5e477cf83c98e

          SHA256

          7807e356e793c9f06ce8f7dfd90b0942ed8c94a59b3f807b6f31efb91b971b2d

          SHA512

          31892e1f272e77a998b7483a16f4f0d35ae80b6a866e3832173ba6992b6057a6b5a77d561c37dca34710333f563021f5400cbc52b3f148097526bdfe916bb7bb

        • C:\Users\Admin\AppData\Local\Temp\8c0200b8-c64e-4ccd-81c7-bcc27a7a7687.vbs

          Filesize

          723B

          MD5

          36e24c97e4d32079c32844d7110a2859

          SHA1

          ec7b785f1b6fa8236b075e907b3fbaf01b05181f

          SHA256

          499729eeb3eec1012130481890040a290922c21773f05de0964be04a6cb405e7

          SHA512

          d6ea02457807a6d1f23eb0ce0905dd5b24b0360de06911676116bac8c9faadbc2908ac33f12b851cb9196185c18a8ec1823b496e661e1737ad97a785e289f254

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_yyjguhdr.l1k.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

        • C:\Windows\appcompat\Programs\RuntimeBroker.exe

          Filesize

          2.8MB

          MD5

          2021a9779c45f35a46b1b28f2e9136fa

          SHA1

          76e03dfcc8732388fad4fd83b72b34cad50786ca

          SHA256

          c8ea81ec0afa16e1e7c0bc325396be024c993479765a9e4ad26b29d83bbfb01a

          SHA512

          5fc1617b672c308df2116cbfcd08e6d6b1c4969c3399dd9eb4c6d12a08bac23ac897c76de20cb1730fe44b50cf2bb840b11332f01f016ca1d4d6ab1bbdd19116

        • memory/1620-50-0x00000279748C0000-0x00000279748E2000-memory.dmp

          Filesize

          136KB

        • memory/4744-18-0x000000001C190000-0x000000001C198000-memory.dmp

          Filesize

          32KB

        • memory/4744-26-0x000000001C410000-0x000000001C41C000-memory.dmp

          Filesize

          48KB

        • memory/4744-10-0x0000000002EC0000-0x0000000002ECA000-memory.dmp

          Filesize

          40KB

        • memory/4744-11-0x000000001C0F0000-0x000000001C146000-memory.dmp

          Filesize

          344KB

        • memory/4744-12-0x000000001B900000-0x000000001B908000-memory.dmp

          Filesize

          32KB

        • memory/4744-13-0x000000001B910000-0x000000001B91C000-memory.dmp

          Filesize

          48KB

        • memory/4744-14-0x000000001C140000-0x000000001C148000-memory.dmp

          Filesize

          32KB

        • memory/4744-15-0x000000001C150000-0x000000001C162000-memory.dmp

          Filesize

          72KB

        • memory/4744-16-0x000000001C6B0000-0x000000001CBD8000-memory.dmp

          Filesize

          5.2MB

        • memory/4744-17-0x000000001C180000-0x000000001C18C000-memory.dmp

          Filesize

          48KB

        • memory/4744-0-0x00007FF81A2E3000-0x00007FF81A2E5000-memory.dmp

          Filesize

          8KB

        • memory/4744-19-0x000000001C1A0000-0x000000001C1AC000-memory.dmp

          Filesize

          48KB

        • memory/4744-20-0x000000001C1B0000-0x000000001C1BC000-memory.dmp

          Filesize

          48KB

        • memory/4744-21-0x000000001C400000-0x000000001C408000-memory.dmp

          Filesize

          32KB

        • memory/4744-23-0x000000001C2D0000-0x000000001C2DE000-memory.dmp

          Filesize

          56KB

        • memory/4744-8-0x0000000002EA0000-0x0000000002EA8000-memory.dmp

          Filesize

          32KB

        • memory/4744-25-0x000000001C3F0000-0x000000001C3FA000-memory.dmp

          Filesize

          40KB

        • memory/4744-27-0x00007FF81A2E0000-0x00007FF81ADA1000-memory.dmp

          Filesize

          10.8MB

        • memory/4744-24-0x000000001C2E0000-0x000000001C2E8000-memory.dmp

          Filesize

          32KB

        • memory/4744-22-0x000000001C2C0000-0x000000001C2CA000-memory.dmp

          Filesize

          40KB

        • memory/4744-30-0x00007FF81A2E0000-0x00007FF81ADA1000-memory.dmp

          Filesize

          10.8MB

        • memory/4744-9-0x0000000002EB0000-0x0000000002EC0000-memory.dmp

          Filesize

          64KB

        • memory/4744-44-0x00007FF81A2E0000-0x00007FF81ADA1000-memory.dmp

          Filesize

          10.8MB

        • memory/4744-7-0x0000000002E90000-0x0000000002E98000-memory.dmp

          Filesize

          32KB

        • memory/4744-6-0x0000000002E70000-0x0000000002E86000-memory.dmp

          Filesize

          88KB

        • memory/4744-5-0x0000000002E60000-0x0000000002E68000-memory.dmp

          Filesize

          32KB

        • memory/4744-4-0x000000001B8B0000-0x000000001B900000-memory.dmp

          Filesize

          320KB

        • memory/4744-3-0x0000000002E40000-0x0000000002E5C000-memory.dmp

          Filesize

          112KB

        • memory/4744-2-0x00007FF81A2E0000-0x00007FF81ADA1000-memory.dmp

          Filesize

          10.8MB

        • memory/4744-1-0x0000000000960000-0x0000000000C2C000-memory.dmp

          Filesize

          2.8MB