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Analysis

  • max time kernel
    273s
  • max time network
    303s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/04/2023, 08:29

General

  • Target

    agentbroker-cleaned.exe

  • Size

    324KB

  • MD5

    13574e140395ffcbedf91cfbe7a3cdaf

  • SHA1

    dcd4ce19754c56a5c0c65012fde8ac14c4932124

  • SHA256

    7b2a00a5aa73f0bb88c2d4751423d55a9c30d3cc665e05a9710db83723223a35

  • SHA512

    18b3e95aafaa0a55d29ac55ea54dc32b44d41f525407158c43b0cc18b2c58ed07b8db4f8cf9131a454145dbe79d35cd0197a70022c5125108176e3ff5a02ad03

  • SSDEEP

    6144:K71egH5NLdW7/foTziLGm//2VWhdi1HbXPk7Dbc/Qf:K5BZNZW7/b56C0

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 9 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.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 2 IoCs

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

  • Drops file in Windows directory 5 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 9 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 behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 6 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\agentbroker-cleaned.exe
    "C:\Users\Admin\AppData\Local\Temp\agentbroker-cleaned.exe"
    1⤵
    • Checks computer location settings
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4740
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\cSpv0pCWHk.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:692
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:3944
        • C:\Windows\SoftwareDistribution\DataStore\Logs\csrss.exe
          "C:\Windows\SoftwareDistribution\DataStore\Logs\csrss.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious behavior: GetForegroundWindowSpam
          • Suspicious use of AdjustPrivilegeToken
          PID:5040
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 13 /tr "'C:\Windows\addins\sppsvc.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2820
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\addins\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1760
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 7 /tr "'C:\Windows\addins\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2044
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 11 /tr "'C:\odt\System.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3108
    • 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:3532
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\odt\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4400
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\Windows\SoftwareDistribution\DataStore\Logs\csrss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3428
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\SoftwareDistribution\DataStore\Logs\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4944
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\Windows\SoftwareDistribution\DataStore\Logs\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2180

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\cSpv0pCWHk.bat

      Filesize

      221B

      MD5

      b496879bdf1f04ab88502323f05b2282

      SHA1

      0fe5fa98c3eb9c8881679c963fa769ecaa345c71

      SHA256

      1189bd9b2b52dd3a0bdd82b26e99c68f24b85e39bdc43a251490406b6dc4675a

      SHA512

      a59eb22cc569d40ca65cb4f504928dea94c7e2b7cd701a0b5a4b12d5c51d353797decddceca32929f1f90ed2985263cc95d5dea44b2cd70ff46c4f7bb38b0b97

    • C:\Windows\SoftwareDistribution\DataStore\Logs\csrss.exe

      Filesize

      324KB

      MD5

      13574e140395ffcbedf91cfbe7a3cdaf

      SHA1

      dcd4ce19754c56a5c0c65012fde8ac14c4932124

      SHA256

      7b2a00a5aa73f0bb88c2d4751423d55a9c30d3cc665e05a9710db83723223a35

      SHA512

      18b3e95aafaa0a55d29ac55ea54dc32b44d41f525407158c43b0cc18b2c58ed07b8db4f8cf9131a454145dbe79d35cd0197a70022c5125108176e3ff5a02ad03

    • C:\Windows\SoftwareDistribution\DataStore\Logs\csrss.exe

      Filesize

      324KB

      MD5

      13574e140395ffcbedf91cfbe7a3cdaf

      SHA1

      dcd4ce19754c56a5c0c65012fde8ac14c4932124

      SHA256

      7b2a00a5aa73f0bb88c2d4751423d55a9c30d3cc665e05a9710db83723223a35

      SHA512

      18b3e95aafaa0a55d29ac55ea54dc32b44d41f525407158c43b0cc18b2c58ed07b8db4f8cf9131a454145dbe79d35cd0197a70022c5125108176e3ff5a02ad03

    • memory/4740-136-0x00000000007F0000-0x0000000000848000-memory.dmp

      Filesize

      352KB

    • memory/4740-137-0x000000001B550000-0x000000001B560000-memory.dmp

      Filesize

      64KB