Analysis

  • max time kernel
    143s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/09/2022, 09:46

General

  • Target
    0db3bd8867b907641a93e28668e23ba9.exe
  • Size 1.3MB
  • Sample220903-lrlv7achhp
  • SHA256 bd8e5756ee13b2df392e55ab38022a80591d4e993066c0f443b73d3bf6d1c9d7
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10

Malware Config

Signatures

  • DcRat

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

  • Process spawned unexpected child process 24 IoCs

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

  • DCRat payload 3 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 3 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Program Files directory 11 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 24 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 16 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 32 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0db3bd8867b907641a93e28668e23ba9.exe
    "C:\Users\Admin\AppData\Local\Temp\0db3bd8867b907641a93e28668e23ba9.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:960
    • C:\Users\Admin\AppData\Local\Temp\0db3bd8867b907641a93e28668e23ba9.exe
      C:\Users\Admin\AppData\Local\Temp\0db3bd8867b907641a93e28668e23ba9.exe
      2⤵
      • Checks computer location settings
      • 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:4000
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\BS1fxSVcEO.bat"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1928
        • C:\Windows\SysWOW64\w32tm.exe
          w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2916
          • C:\Windows\system32\w32tm.exe
            w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
            5⤵
              PID:5108
          • C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe
            "C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:2184
            • C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe
              "C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe"
              5⤵
              • Executes dropped EXE
              PID:844
            • C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe
              "C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:2704
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Program Files\7-Zip\Lang\dllhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1088
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files\7-Zip\Lang\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4472
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Program Files\7-Zip\Lang\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2436
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 10 /tr "'C:\Users\Admin\Music\Idle.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4640
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Users\Admin\Music\Idle.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3104
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 6 /tr "'C:\Users\Admin\Music\Idle.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2840
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\odt\System.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4004
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\odt\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4552
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 12 /tr "'C:\odt\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3364
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\sihost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:948
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1208
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3820
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Sidebar\fontdrvhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4800
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files\Windows Sidebar\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4312
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 10 /tr "'C:\Program Files\Windows Sidebar\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:5012
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows Mail\smss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:632
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4536
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Mail\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3272
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\Program Files\Windows Multimedia Platform\csrss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3320
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Windows Multimedia Platform\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4684
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows Multimedia Platform\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4780
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2616
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3640
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2232

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          backgroundTaskHost.exe

          • Path C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe
          • Size 1.3MB
          • SHA256 bd8e5756ee13b2df392e55ab38022a80591d4e993066c0f443b73d3bf6d1c9d7
          • MD5 SHA1 SHA512 SSDEEP

          backgroundTaskHost.exe

          • Path C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe
          • Size 1.3MB
          • SHA256 bd8e5756ee13b2df392e55ab38022a80591d4e993066c0f443b73d3bf6d1c9d7
          • MD5 SHA1 SHA512 SSDEEP

          backgroundTaskHost.exe

          • Path C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe
          • Size 1.3MB
          • SHA256 bd8e5756ee13b2df392e55ab38022a80591d4e993066c0f443b73d3bf6d1c9d7
          • MD5 SHA1 SHA512 SSDEEP

          backgroundTaskHost.exe

          • Path C:\Program Files (x86)\Internet Explorer\fr-FR\backgroundTaskHost.exe
          • Size 1.3MB
          • SHA256 bd8e5756ee13b2df392e55ab38022a80591d4e993066c0f443b73d3bf6d1c9d7
          • MD5 SHA1 SHA512 SSDEEP

          0db3bd8867b907641a93e28668e23ba9.exe.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\0db3bd8867b907641a93e28668e23ba9.exe.log
          • Size 789B
          • SHA256 745ab70552d9a0463b791fd8dc1942838ac3e34fb1a68f09ed3766c7e3b05631
          • MD5 SHA1 SHA512

          backgroundTaskHost.exe.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\backgroundTaskHost.exe.log
          • Size 789B
          • SHA256 745ab70552d9a0463b791fd8dc1942838ac3e34fb1a68f09ed3766c7e3b05631
          • MD5 SHA1 SHA512

          BS1fxSVcEO.bat

          • Path C:\Users\Admin\AppData\Local\Temp\BS1fxSVcEO.bat
          • Size 234B
          • SHA256 ce434d15f422627129152bea0ebbe9dc9e7f23391000643b8f6a07a5ce5ae87e
          • MD5 SHA1 SHA512

          memory/960-135-0x0000000005800000-0x0000000005876000-memory.dmp

          memory/960-132-0x0000000000A60000-0x0000000000BBA000-memory.dmp

          memory/960-136-0x00000000057A0000-0x00000000057BE000-memory.dmp

          memory/960-134-0x0000000007DD0000-0x0000000007E62000-memory.dmp

          memory/960-133-0x00000000082E0000-0x0000000008884000-memory.dmp

          memory/4000-140-0x0000000005D80000-0x0000000005DE6000-memory.dmp

          memory/4000-138-0x0000000000400000-0x00000000004EC000-memory.dmp