Analysis

  • max time kernel
    111s
  • max time network
    121s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-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.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • 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 3 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 6 IoCs
  • Drops file in Windows directory 2 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 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 24 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
    • Checks computer location settings
    • Adds Run key to start application
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2864
    • 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\jcftksot\jcftksot.cmdline"
      2⤵
      • Drops file in System32 directory
      • Suspicious use of WriteProcessMemory
      PID:4060
      • 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\RESAA88.tmp" "c:\Windows\System32\CSC932A48A72780499AA72067926DA1C16C.TMP"
        3⤵
          PID:5036
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Recovery\WindowsRE\dwm.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:4144
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Internet Explorer\it-IT\TextInputHost.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1764
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Public\Music\RuntimeBroker.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:3292
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\tracing\smss.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1688
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Windows Mail\wininit.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:2060
      • 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:1964
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\QkuNgFXync.bat"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2696
        • C:\Windows\system32\chcp.com
          chcp 65001
          3⤵
            PID:1904
          • C:\Windows\system32\w32tm.exe
            w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
            3⤵
              PID:4496
            • C:\Program Files (x86)\Windows Mail\wininit.exe
              "C:\Program Files (x86)\Windows Mail\wininit.exe"
              3⤵
              • Executes dropped EXE
              • Suspicious use of AdjustPrivilegeToken
              PID:4188
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\dwm.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:264
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\dwm.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:1680
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\dwm.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4244
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Internet Explorer\it-IT\TextInputHost.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3856
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\it-IT\TextInputHost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:664
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Internet Explorer\it-IT\TextInputHost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3336
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Users\Public\Music\RuntimeBroker.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:1972
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\Public\Music\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3560
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 8 /tr "'C:\Users\Public\Music\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:404
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Windows\tracing\smss.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:5048
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\tracing\smss.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4316
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "smsss" /sc MINUTE /mo 9 /tr "'C:\Windows\tracing\smss.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3368
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Mail\wininit.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:5116
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\wininit.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:1196
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Windows Mail\wininit.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3448
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e586" /sc MINUTE /mo 10 /tr "'C:\Users\Admin\AppData\Local\Temp\6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:2500
        • 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:4180
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e586" /sc MINUTE /mo 8 /tr "'C:\Users\Admin\AppData\Local\Temp\6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:2732

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Recovery\WindowsRE\dwm.exe

          Filesize

          2.0MB

          MD5

          43a09f586ae8fe86191c47743b5cf744

          SHA1

          a8bc2177c871d0d29e93737a7ebcaa3da8f182de

          SHA256

          6a639fdba14515cf938af997b4c0bd2093b1e099bed8eb4d7950ea5d18e13e58

          SHA512

          ff8acde081b435a1bb0f204359bd7227b380a66e61472546016db41c53c7708c91215af8fbc3fdc8a99d1e15f6139c3e278b04dc483ecc3d952a2d1240efa104

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

          Filesize

          2KB

          MD5

          a43e653ffb5ab07940f4bdd9cc8fade4

          SHA1

          af43d04e3427f111b22dc891c5c7ee8a10ac4123

          SHA256

          c4c53abb13e99475aebfbe9fec7a8fead81c14c80d9dcc2b81375304f3a683fe

          SHA512

          62a97e95e1f19a8d4302847110dae44f469877eed6aa8ea22345c6eb25ee220e7d310fa0b7ec5df42356815421c0af7c46a0f1fee8933cc446641800eda6cd1b

        • 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\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

          Filesize

          944B

          MD5

          77d622bb1a5b250869a3238b9bc1402b

          SHA1

          d47f4003c2554b9dfc4c16f22460b331886b191b

          SHA256

          f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

          SHA512

          d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

        • 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\Temp\QkuNgFXync.bat

          Filesize

          223B

          MD5

          85983d31f36879c00ff17d51a86bd3c0

          SHA1

          35970d120d663159a7029ce6df9a23cdf51fe334

          SHA256

          069ab4ea66f5239f7fe518c4be19d8a8cf4ec15282f6f4fef2cd6874f4ac8a4c

          SHA512

          badc798ab59583a8b0b2ea0d79499c1a44f3003429311e8372ae6112dece7669d11ed811a1eb4f22fa092170d5259bd309419a80a2235401cd4d5023f909387d

        • C:\Users\Admin\AppData\Local\Temp\RESAA88.tmp

          Filesize

          1KB

          MD5

          6431bbdb6f77f2d693f13c37d5b630d0

          SHA1

          65a7b9f3e8c58d12eb1177d82958fa650478c825

          SHA256

          2205f0343978f2cb8176f460dbfb7ee1e1d2d3e47c8c62188f70edd462293ce0

          SHA512

          ad16e5decf974ff84c312c06b1ebdc0503d4bebb3b986c98365a93c0d5c4468abf933b363fd4d6579a95f0a2cf65b0eff6b3f96bfa9560e534d00a51e80427d2

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qssjtgen.jvg.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

          Filesize

          361B

          MD5

          a149de744452d7d9c3627798e07ad3d6

          SHA1

          974ddbeaa0ef77d485087e372be0dad0c2bbb6a9

          SHA256

          4fa31d298fd88157215ecc7bc7ef00277b98486cd1f6ebdc88c298962f20dee0

          SHA512

          18d97fdc515e6c1201da2ea86d7dabe3e2c948028be2a6342b481cdfbffa60b6407f4203c27c7fa2c68a4d92672cd17df78b4b6a507a3449201cdb9102cd4c44

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

          Filesize

          235B

          MD5

          3f88461125ef89dec728fea21f2e6a7e

          SHA1

          e5e17759d21a0503fb74e43d9db8d5d2d52636a6

          SHA256

          c3e214de642f83d6c991a84f6933f2fd22388c7fe7459e123351cb3fcb0d355b

          SHA512

          01edfda0595fd03bff9c2e36c2046a12b801484280c86b5b93b353465c97e27e7e74f8f03501c3a65e63353a9b2f0af8ac8d2caebca666c7d513181294af4fca

        • \??\c:\Windows\System32\CSC932A48A72780499AA72067926DA1C16C.TMP

          Filesize

          1KB

          MD5

          634e281a00b7b9f516c3048badfa1530

          SHA1

          af6369715ce2fe9b99609e470d4f66698880a35a

          SHA256

          0d990336ae793f3f6903048004c8d707d7a7191927bd7df46b7fe887116506c8

          SHA512

          1cb35fa0759f5362c9c7eee5546710874121005a3924bcfec2cf33ac90a257a807ce7ec0db7bc84dcb327604d708009449c34f52560ed936b54eeba49be7d27b

        • memory/1764-66-0x000002317FBF0000-0x000002317FC12000-memory.dmp

          Filesize

          136KB

        • memory/2864-12-0x0000000002620000-0x0000000002638000-memory.dmp

          Filesize

          96KB

        • memory/2864-10-0x000000001B390000-0x000000001B3E0000-memory.dmp

          Filesize

          320KB

        • memory/2864-20-0x00000000024B0000-0x00000000024BE000-memory.dmp

          Filesize

          56KB

        • memory/2864-18-0x000000001B910000-0x000000001BE38000-memory.dmp

          Filesize

          5.2MB

        • memory/2864-22-0x00000000024C0000-0x00000000024CE000-memory.dmp

          Filesize

          56KB

        • memory/2864-24-0x00000000024F0000-0x00000000024F8000-memory.dmp

          Filesize

          32KB

        • memory/2864-26-0x0000000002670000-0x000000000267C000-memory.dmp

          Filesize

          48KB

        • memory/2864-16-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-41-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-42-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-13-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-15-0x0000000002650000-0x0000000002662000-memory.dmp

          Filesize

          72KB

        • memory/2864-0-0x00007FFF96F53000-0x00007FFF96F55000-memory.dmp

          Filesize

          8KB

        • memory/2864-17-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-52-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-9-0x00000000024D0000-0x00000000024EC000-memory.dmp

          Filesize

          112KB

        • memory/2864-7-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-87-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-77-0x000000001C540000-0x000000001C655000-memory.dmp

          Filesize

          1.1MB

        • memory/2864-6-0x0000000002460000-0x000000000246E000-memory.dmp

          Filesize

          56KB

        • memory/2864-4-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-3-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-2-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

          Filesize

          10.8MB

        • memory/2864-1-0x0000000000080000-0x0000000000284000-memory.dmp

          Filesize

          2.0MB

        • memory/4188-140-0x000000001CDA0000-0x000000001CEB5000-memory.dmp

          Filesize

          1.1MB