Analysis

  • max time kernel
    119s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    14-11-2024 05:26

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 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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 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
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2544
    • 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\xv5h53ey\xv5h53ey.cmdline"
      2⤵
      • Drops file in System32 directory
      • Suspicious use of WriteProcessMemory
      PID:2584
      • 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\RESD845.tmp" "c:\Windows\System32\CSC797F64D6C1124E22AAED1FCADA447C4.TMP"
        3⤵
          PID:1860
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\MSBuild\winlogon.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:848
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\smss.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:444
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\All Users\Favorites\sppsvc.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1080
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Microsoft Analysis Services\AS OLEDB\audiodg.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1428
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\MSOCache\All Users\OSPPSVC.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:3024
      • 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:2976
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\QMh4TGGzQW.bat"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:788
        • C:\Windows\system32\chcp.com
          chcp 65001
          3⤵
            PID:1452
          • C:\Windows\system32\PING.EXE
            ping -n 10 localhost
            3⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:356
          • C:\Program Files (x86)\MSBuild\winlogon.exe
            "C:\Program Files (x86)\MSBuild\winlogon.exe"
            3⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            PID:2284
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\MSBuild\winlogon.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2420
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\winlogon.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2612
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\MSBuild\winlogon.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2700
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "smsss" /sc MINUTE /mo 6 /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\smss.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1692
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\smss.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1656
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "smsss" /sc MINUTE /mo 6 /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\smss.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2916
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 13 /tr "'C:\Users\All Users\Favorites\sppsvc.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2488
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Users\All Users\Favorites\sppsvc.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1380
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 10 /tr "'C:\Users\All Users\Favorites\sppsvc.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2852
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Microsoft Analysis Services\AS OLEDB\audiodg.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2164
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Analysis Services\AS OLEDB\audiodg.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2832
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Microsoft Analysis Services\AS OLEDB\audiodg.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1060
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 5 /tr "'C:\MSOCache\All Users\OSPPSVC.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1616
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\MSOCache\All Users\OSPPSVC.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1264
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 7 /tr "'C:\MSOCache\All Users\OSPPSVC.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2984
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e586" /sc MINUTE /mo 11 /tr "'C:\Users\Admin\AppData\Local\Temp\6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2912
      • 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:2980
      • 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:2416

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Program Files (x86)\MSBuild\winlogon.exe

        Filesize

        2.0MB

        MD5

        43a09f586ae8fe86191c47743b5cf744

        SHA1

        a8bc2177c871d0d29e93737a7ebcaa3da8f182de

        SHA256

        6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58

        SHA512

        ff8acde081b435a1bb0f204359bd7227b380a66e61472546016db41c53c7708c91215af8fbc3fdc8a99d1e15f6139c3e278b04dc483ecc3d952a2d1240efa104

      • C:\Users\Admin\AppData\Local\Temp\QMh4TGGzQW.bat

        Filesize

        171B

        MD5

        f4ba642eaae469e502aa17d97b17c67e

        SHA1

        509456d43331e55a105a2e746714e0b361fbf99b

        SHA256

        8080b3eb59217759a4b8a4d6454e27a940d4739653d08ab38729f2e0ec1ed5a1

        SHA512

        4abe5bc5b7e044ce6eefd13efe425fc11a06f1872e20e87659ccf91814f9e6504d6c6156922b598d35df843fa811fa86b0c70ad8297ce98676bda85deaaedbde

      • C:\Users\Admin\AppData\Local\Temp\RESD845.tmp

        Filesize

        1KB

        MD5

        8fe34f56303321538008cb8c3e74a2ac

        SHA1

        29ab579abeb3e210f68b1c7ee85db047a54fb982

        SHA256

        ae4b26aa24b54bbae1a194923efd7f1316fff25bda89955fb62ecc60c539e64d

        SHA512

        ce0dffc464eb6117a528979d33a36f56a0235983665fc0d2021bfe8885595d6cbc46ca29f6dd081acf778cf4dee528e53f41029245bd72592117247cfdc8ef12

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\XUHQK88HOTG6VVAHNLLI.temp

        Filesize

        7KB

        MD5

        4d0f0186517f6af8f22c9e99a64d9eea

        SHA1

        430648afbf74777d26e29a2595c8519745ea54ec

        SHA256

        761549d6f6b579825e521fe55c505fa5ef74a56e903ebf635cf2fc60944a83ce

        SHA512

        a4763474f0463b008e2788dbe68e74b24e41a34a3e3970f486ddf0664972cc549e52bd0220314bae248fc72f6a968305a57cc938f57d5d50d7564e9a226b354b

      • \??\c:\Users\Admin\AppData\Local\Temp\xv5h53ey\xv5h53ey.0.cs

        Filesize

        375B

        MD5

        9bfdc74d290fe847832832db70b4e549

        SHA1

        b252be6a72ba79af590e6cd896a2ddddc3421891

        SHA256

        448a3fb67e6395bed2ca4dd8fc2332bca3faa3cb1b209acc0fee780bf09cfa93

        SHA512

        7bc00c136625f5ef578e8450b0b655b0b258fe96caf1f49a3bda450402f38c075c1879638f1e88fcabb2825225d7e213ea8b461b83f82d217ac166d66886ee72

      • \??\c:\Users\Admin\AppData\Local\Temp\xv5h53ey\xv5h53ey.cmdline

        Filesize

        235B

        MD5

        7ff84dd16a251cf561c9e26dc90ea6ab

        SHA1

        84bc607f09034ca9e14f4bd1883e37040cb1df67

        SHA256

        0a31fc6d0c6f2a87ace241e7d4433106de536cf49bb849487507093fdb5710f8

        SHA512

        cc877aedf8b5ebd624a058b838ad5f88fc71a5d210c3859fb6ac1caa8e5ba2131919b3780286d691a5b8772925022a0d8e5a169093b6815475b06ab01db8939f

      • \??\c:\Windows\System32\CSC797F64D6C1124E22AAED1FCADA447C4.TMP

        Filesize

        1KB

        MD5

        167c870490dc33ec13a83ebb533b1bf6

        SHA1

        182378ebfa7c8372a988dee50a7dd6f8cda6a367

        SHA256

        3f742a374ad5a8da8fba9dfea27c7382dde145d46732cfc0002a53a1311df5e6

        SHA512

        1b48bb5f270f5d99d9dd98cd9da5866aed9377957d92bf1d686878522c438b38a444073c1a0ed4cc85f97315d2ef6abf05b74ab2265fecb20be5795b2ccef64e

      • memory/848-72-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

        Filesize

        32KB

      • memory/1080-71-0x000000001B630000-0x000000001B912000-memory.dmp

        Filesize

        2.9MB

      • memory/2284-91-0x0000000000A60000-0x0000000000C64000-memory.dmp

        Filesize

        2.0MB

      • memory/2544-11-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-0-0x000007FEF5B63000-0x000007FEF5B64000-memory.dmp

        Filesize

        4KB

      • memory/2544-15-0x0000000000720000-0x0000000000732000-memory.dmp

        Filesize

        72KB

      • memory/2544-13-0x0000000000700000-0x0000000000718000-memory.dmp

        Filesize

        96KB

      • memory/2544-20-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-21-0x000007FEF5B63000-0x000007FEF5B64000-memory.dmp

        Filesize

        4KB

      • memory/2544-28-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-27-0x0000000000740000-0x000000000074C000-memory.dmp

        Filesize

        48KB

      • memory/2544-25-0x0000000000670000-0x0000000000678000-memory.dmp

        Filesize

        32KB

      • memory/2544-23-0x0000000000640000-0x000000000064E000-memory.dmp

        Filesize

        56KB

      • memory/2544-19-0x0000000000630000-0x000000000063E000-memory.dmp

        Filesize

        56KB

      • memory/2544-17-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-10-0x0000000000650000-0x000000000066C000-memory.dmp

        Filesize

        112KB

      • memory/2544-16-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-8-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-7-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-52-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-53-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-54-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-6-0x0000000000620000-0x000000000062E000-memory.dmp

        Filesize

        56KB

      • memory/2544-70-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-4-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-3-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-2-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

        Filesize

        9.9MB

      • memory/2544-1-0x00000000002A0000-0x00000000004A4000-memory.dmp

        Filesize

        2.0MB