Analysis

  • max time kernel
    141s
  • max time network
    146s
  • platform
    windows7_x64
  • resource
    win7-20241010-en
  • resource tags

    arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
  • submitted
    14-11-2024 05:32

General

  • Target

    6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58.exe

  • Size

    2.0MB

  • MD5

    43a09f586ae8fe86191c47743b5cf744

  • SHA1

    a8bc2177c871d0d29e93737a7ebcaa3da8f182de

  • SHA256

    6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58

  • SHA512

    ff8acde081b435a1bb0f204359bd7227b380a66e61472546016db41c53c7708c91215af8fbc3fdc8a99d1e15f6139c3e278b04dc483ecc3d952a2d1240efa104

  • SSDEEP

    49152:+bv4/KHiciethGCUA1TJeUCMkiOT3eY1CKzuJtGvAAzB:+bv4/BUVb5JLChiAu1evAoB

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Modifies WinLogon for persistence 2 TTPs 6 IoCs
  • Process spawned unexpected child process 18 IoCs

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

  • Command and Scripting Interpreter: PowerShell 1 TTPs 6 IoCs

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

  • Executes dropped EXE 1 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 12 IoCs
  • Looks up external IP address via web service 4 IoCs

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

  • Drops file in System32 directory 2 IoCs
  • Drops file in Program Files directory 7 IoCs
  • Drops file in Windows directory 2 IoCs
  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Modifies system certificate store 2 TTPs 2 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 18 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 8 IoCs
  • Suspicious use of WriteProcessMemory 36 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\6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58.exe
    "C:\Users\Admin\AppData\Local\Temp\6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Adds Run key to start application
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2676
    • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
      "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\wyfaveo0\wyfaveo0.cmdline"
      2⤵
      • Drops file in System32 directory
      • Suspicious use of WriteProcessMemory
      PID:2760
      • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
        C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESA841.tmp" "c:\Windows\System32\CSC97965B20833D493AAC47CB9B9269EE9.TMP"
        3⤵
          PID:2352
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files\Java\csrss.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:2092
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\security\ApplicationId\PolicyManagement\lsm.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1092
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\spoolsv.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1524
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Windows Media Player\Media Renderer\lsm.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:536
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files\VideoLAN\VLC\WmiPrvSE.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:2960
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1708
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\P5jIi4Pr6U.bat"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:484
        • C:\Windows\system32\chcp.com
          chcp 65001
          3⤵
            PID:236
          • C:\Windows\system32\PING.EXE
            ping -n 10 localhost
            3⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:2288
          • C:\Program Files\VideoLAN\VLC\WmiPrvSE.exe
            "C:\Program Files\VideoLAN\VLC\WmiPrvSE.exe"
            3⤵
            • Executes dropped EXE
            • Suspicious behavior: GetForegroundWindowSpam
            • Suspicious use of AdjustPrivilegeToken
            PID:2384
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Program Files\Java\csrss.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2744
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Java\csrss.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2828
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Program Files\Java\csrss.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2860
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsml" /sc MINUTE /mo 12 /tr "'C:\Windows\security\ApplicationId\PolicyManagement\lsm.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2604
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\security\ApplicationId\PolicyManagement\lsm.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2712
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsml" /sc MINUTE /mo 10 /tr "'C:\Windows\security\ApplicationId\PolicyManagement\lsm.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2644
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 14 /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\spoolsv.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:3068
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\spoolsv.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:984
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 6 /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\spoolsv.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2864
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsml" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Windows Media Player\Media Renderer\lsm.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2028
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Media Player\Media Renderer\lsm.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:748
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsml" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Media Player\Media Renderer\lsm.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1820
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 11 /tr "'C:\Program Files\VideoLAN\VLC\WmiPrvSE.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1512
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files\VideoLAN\VLC\WmiPrvSE.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1644
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 5 /tr "'C:\Program Files\VideoLAN\VLC\WmiPrvSE.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1936
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e586" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\AppData\Local\Temp\6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1712
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2936
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e586" /sc MINUTE /mo 10 /tr "'C:\Users\Admin\AppData\Local\Temp\6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1584

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Program Files\Java\csrss.exe

        Filesize

        2.0MB

        MD5

        43a09f586ae8fe86191c47743b5cf744

        SHA1

        a8bc2177c871d0d29e93737a7ebcaa3da8f182de

        SHA256

        6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58

        SHA512

        ff8acde081b435a1bb0f204359bd7227b380a66e61472546016db41c53c7708c91215af8fbc3fdc8a99d1e15f6139c3e278b04dc483ecc3d952a2d1240efa104

      • C:\Users\Admin\AppData\Local\Temp\P5jIi4Pr6U.bat

        Filesize

        170B

        MD5

        5cfbbb02929578e011fa8e0f058c94aa

        SHA1

        502bee3c3096073893f8372a97d5ce72acb3ea70

        SHA256

        f23b0b34523453d249af2890d33fd9b76cf36426279123a9b5691566959c1d41

        SHA512

        86f14a4c7bd1e4f7ba64fcd606870d43ae165d2d0ad57615c262c9730a8c7930aa429d4f31b903831873266090c7dd0e8d8d533f798dc8953573fc75fbb06902

      • C:\Users\Admin\AppData\Local\Temp\RESA841.tmp

        Filesize

        1KB

        MD5

        882272dc92f38a0f1ea7126ca1c59616

        SHA1

        1a326b040ffa0b466b3751f3d7afb916328a4020

        SHA256

        a4c9b234916b7e9994fa6427bfad16625644f725de497bfc822f3dae897d6920

        SHA512

        f79782a4657de87f4132a9ab9bcf1dab9e66892b949156fc2a8ea68f76bc4ac5e7bef00d566e3e14cb93b389b9af034e2bfe1a3d0abd8455500e492290839077

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\E4ZRI46PQAJIMY7SCBJY.temp

        Filesize

        7KB

        MD5

        2dcb55e09b422f4f7ecc3ef730f8b492

        SHA1

        c7294e3224042a1b709556af0b0a7c8100a60d0c

        SHA256

        cd06d69257688e798875c2234070a65fc5d73ce02c1ab031b0f1100ffcde403d

        SHA512

        5e0495d73baf143153a7e3da28321ef706b7904d87203ecd834e55028ce210f02b659459241165e6b17cca401fefc25c88f0ae7adfeb2cf7fea1dbaaec1b36c2

      • \??\c:\Users\Admin\AppData\Local\Temp\wyfaveo0\wyfaveo0.0.cs

        Filesize

        363B

        MD5

        b868addbf97b6f1d1604eec40c1c5ee8

        SHA1

        4a1f59ea8e337c7b49fcbf3fe560779698a50776

        SHA256

        bb79a728a63fa012aa26ab5550af8209f017720bba55c2a094490bdfb985d5d7

        SHA512

        3592d928264dc1769c07f373c9ea49cd923dbeeaf8e5c333f00ec49081e78fd5112beee4d1e5d8186145bffd27265a4e8e586d28b799e3fbf05728c966052a2b

      • \??\c:\Users\Admin\AppData\Local\Temp\wyfaveo0\wyfaveo0.cmdline

        Filesize

        235B

        MD5

        98e5dd25034587468481ca2597a27199

        SHA1

        7f56a88519e5c1c571f5d90b9cf8dbdca71078d3

        SHA256

        8a7caa88dfb7adf22ab7bdfbb5df71763b4d4437656d143fc39e8efb57768b12

        SHA512

        12ca89ed49a9a24460a3f0b1c0858b8c063152396bb5e7c9f14daf57c5f1ac2b61f4a475c79ddd7d0cb911a29f30b16445f16d6a5673607916a7b1a47f6630cd

      • \??\c:\Windows\System32\CSC97965B20833D493AAC47CB9B9269EE9.TMP

        Filesize

        1KB

        MD5

        70046c6c63d509bb29450ef32b59dda3

        SHA1

        26802b73997ee22a7cd3d07ae77016969603cf00

        SHA256

        dd0e7409cd9412eafdd8f881d6094fb539ad19c7a54d76043de655a00f80f5d0

        SHA512

        d7b8d4ed84b8e1f5e416c378872bb7bc6d884341f0aa76f2c3b664f1ad0324a2d749c51718f3940d61663d152c35ba241ce0def03a002c6423a4d0957866c96f

      • memory/1524-74-0x0000000002880000-0x0000000002888000-memory.dmp

        Filesize

        32KB

      • memory/1708-73-0x000000001B730000-0x000000001BA12000-memory.dmp

        Filesize

        2.9MB

      • memory/2384-92-0x0000000000830000-0x0000000000A34000-memory.dmp

        Filesize

        2.0MB

      • memory/2676-23-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-12-0x0000000000B90000-0x0000000000BA2000-memory.dmp

        Filesize

        72KB

      • memory/2676-17-0x0000000000B30000-0x0000000000B3E000-memory.dmp

        Filesize

        56KB

      • memory/2676-19-0x0000000000B40000-0x0000000000B4E000-memory.dmp

        Filesize

        56KB

      • memory/2676-20-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-22-0x0000000000BB0000-0x0000000000BB8000-memory.dmp

        Filesize

        32KB

      • memory/2676-0-0x000007FEF5713000-0x000007FEF5714000-memory.dmp

        Filesize

        4KB

      • memory/2676-24-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-26-0x0000000000BC0000-0x0000000000BCC000-memory.dmp

        Filesize

        48KB

      • memory/2676-14-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-13-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-15-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-10-0x0000000000B70000-0x0000000000B88000-memory.dmp

        Filesize

        96KB

      • memory/2676-8-0x0000000000B50000-0x0000000000B6C000-memory.dmp

        Filesize

        112KB

      • memory/2676-50-0x000007FEF5713000-0x000007FEF5714000-memory.dmp

        Filesize

        4KB

      • memory/2676-51-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-52-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-6-0x0000000000AA0000-0x0000000000AAE000-memory.dmp

        Filesize

        56KB

      • memory/2676-72-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-4-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-3-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-2-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

        Filesize

        9.9MB

      • memory/2676-1-0x00000000012D0000-0x00000000014D4000-memory.dmp

        Filesize

        2.0MB