Analysis

  • max time kernel
    60s
  • max time network
    138s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30-01-2023 18:56

General

  • Target

    25bc30afa69d34b938949f1f75a41a142636603a71607e2313e0ce467af93152.exe

  • Size

    532KB

  • MD5

    7fbdb2f5c7830894d0436a8291e1231f

  • SHA1

    22a13d9bacb8dcf04eb0260999f75fed68d21d0a

  • SHA256

    25bc30afa69d34b938949f1f75a41a142636603a71607e2313e0ce467af93152

  • SHA512

    186f41e9bf79dd0e3711c95d2a73ac734efe83b2321f4f5cd920bf21e95c4075829780d91adbce471335a76cc786a68d8162447b6032465def9d54e8e6b36c1d

  • SSDEEP

    12288:KqnOG4bunLVYAN2ehGtdd3vzQ2JzgW8Lntk:K+OG4bcYAnhGl3U2Jz

Malware Config

Signatures

  • DcRat

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

  • Modifies WinLogon for persistence 2 TTPs 7 IoCs
  • DCRat payload 3 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

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

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

  • Adds Run key to start application 2 TTPs 14 IoCs
  • Drops file in System32 directory 3 IoCs
  • Drops file in Windows directory 2 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 7 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\25bc30afa69d34b938949f1f75a41a142636603a71607e2313e0ce467af93152.exe
    "C:\Users\Admin\AppData\Local\Temp\25bc30afa69d34b938949f1f75a41a142636603a71607e2313e0ce467af93152.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Checks computer location settings
    • Adds Run key to start application
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1036
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\C_936\fontdrvhost.exe'" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:5096
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Documents and Settings\fontdrvhost.exe'" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2032
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "25bc30afa69d34b938949f1f75a41a142636603a71607e2313e0ce467af93152" /sc ONLOGON /tr "'C:\odt\25bc30afa69d34b938949f1f75a41a142636603a71607e2313e0ce467af93152.exe'" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:4204
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\AppxManifest\StartMenuExperienceHost.exe'" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2376
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Documents and Settings\SearchApp.exe'" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:3592
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "25bc30afa69d34b938949f1f75a41a142636603a71607e2313e0ce467af93152" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\AdobeSFX\25bc30afa69d34b938949f1f75a41a142636603a71607e2313e0ce467af93152.exe'" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:328
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:4596
    • C:\Documents and Settings\SearchApp.exe
      "C:\Documents and Settings\SearchApp.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3844

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Documents and Settings\SearchApp.exe

    Filesize

    532KB

    MD5

    7fbdb2f5c7830894d0436a8291e1231f

    SHA1

    22a13d9bacb8dcf04eb0260999f75fed68d21d0a

    SHA256

    25bc30afa69d34b938949f1f75a41a142636603a71607e2313e0ce467af93152

    SHA512

    186f41e9bf79dd0e3711c95d2a73ac734efe83b2321f4f5cd920bf21e95c4075829780d91adbce471335a76cc786a68d8162447b6032465def9d54e8e6b36c1d

  • C:\Users\SearchApp.exe

    Filesize

    532KB

    MD5

    7fbdb2f5c7830894d0436a8291e1231f

    SHA1

    22a13d9bacb8dcf04eb0260999f75fed68d21d0a

    SHA256

    25bc30afa69d34b938949f1f75a41a142636603a71607e2313e0ce467af93152

    SHA512

    186f41e9bf79dd0e3711c95d2a73ac734efe83b2321f4f5cd920bf21e95c4075829780d91adbce471335a76cc786a68d8162447b6032465def9d54e8e6b36c1d

  • memory/328-139-0x0000000000000000-mapping.dmp

  • memory/1036-133-0x00007FF8B3D60000-0x00007FF8B4821000-memory.dmp

    Filesize

    10.8MB

  • memory/1036-144-0x00007FF8B3D60000-0x00007FF8B4821000-memory.dmp

    Filesize

    10.8MB

  • memory/1036-132-0x00000000000D0000-0x000000000015C000-memory.dmp

    Filesize

    560KB

  • memory/2032-135-0x0000000000000000-mapping.dmp

  • memory/2376-137-0x0000000000000000-mapping.dmp

  • memory/3592-138-0x0000000000000000-mapping.dmp

  • memory/3844-141-0x0000000000000000-mapping.dmp

  • memory/3844-145-0x00007FF8B3D60000-0x00007FF8B4821000-memory.dmp

    Filesize

    10.8MB

  • memory/3844-146-0x00007FF8B3D60000-0x00007FF8B4821000-memory.dmp

    Filesize

    10.8MB

  • memory/4204-136-0x0000000000000000-mapping.dmp

  • memory/4596-140-0x0000000000000000-mapping.dmp

  • memory/5096-134-0x0000000000000000-mapping.dmp