Analysis

  • max time kernel
    121s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    29/01/2025, 04:31

General

  • Target
    a079d0ef7608f8fb08e6e67ebe720cdd.exe
  • Size 2.7MB
  • Sample250129-e5dy6s1lcs
  • SHA256 647194fc5716bcdebe9b20e13b3f08e7816d13530a15e8d1669f2f25ba628274
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Process spawned unexpected child process 24 IoCs

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

  • DCRat payload 5 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Detected Nirsoft tools 2 IoCs

    Free utilities often used by attackers which can steal passwords, product keys, etc.

  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 4 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Drops file in Program Files directory 2 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Scheduled Task/Job: Scheduled Task 1 TTPs 24 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 23 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\a079d0ef7608f8fb08e6e67ebe720cdd.exe
    "C:\Users\Admin\AppData\Local\Temp\a079d0ef7608f8fb08e6e67ebe720cdd.exe"
    1⤵
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2368
    • C:\Users\Admin\AppData\Local\Temp\svchost.exe
      "C:\Users\Admin\AppData\Local\Temp\svchost.exe"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:1984
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\MsSession\Ov1RwD.vbe"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2152
        • C:\Windows\SysWOW64\cmd.exe
          cmd /c ""C:\MsSession\K37wJmF1HmUF8ALyjA8MpCp.bat" "
          4⤵
          • Loads dropped DLL
          • System Location Discovery: System Language Discovery
          • Suspicious use of WriteProcessMemory
          PID:2688
          • C:\MsSession\hyperComwin.exe
            "C:\MsSession\hyperComwin.exe"
            5⤵
            • Executes dropped EXE
            • Drops file in Program Files directory
            • Drops file in Windows directory
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of WriteProcessMemory
            PID:2748
            • C:\Program Files\Uninstall Information\spoolsv.exe
              "C:\Program Files\Uninstall Information\spoolsv.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              PID:1324
    • C:\Users\Admin\AppData\Local\Temp\explorer.exe
      "C:\Users\Admin\AppData\Local\Temp\explorer.exe"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      PID:2992
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 10 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\sppsvc.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1028
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\sppsvc.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2456
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 9 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\sppsvc.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1212
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 10 /tr "'C:\Program Files\Uninstall Information\spoolsv.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:868
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Program Files\Uninstall Information\spoolsv.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1960
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 10 /tr "'C:\Program Files\Uninstall Information\spoolsv.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1208
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 10 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\conhost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2872
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\conhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1940
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 6 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\conhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1784
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 12 /tr "'C:\MsSession\lsass.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1220
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\MsSession\lsass.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2892
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 9 /tr "'C:\MsSession\lsass.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1168
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 12 /tr "'C:\MSOCache\All Users\{90140000-00BA-0409-0000-0000000FF1CE}-C\wininit.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3016
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-00BA-0409-0000-0000000FF1CE}-C\wininit.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3004
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 10 /tr "'C:\MSOCache\All Users\{90140000-00BA-0409-0000-0000000FF1CE}-C\wininit.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2804
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 11 /tr "'C:\MsSession\conhost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2252
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\MsSession\conhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2372
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 5 /tr "'C:\MsSession\conhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2264
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 9 /tr "'C:\MsSession\Idle.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1408
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\MsSession\Idle.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1584
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 6 /tr "'C:\MsSession\Idle.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:448
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 10 /tr "'C:\Windows\SoftwareDistribution\AuthCabs\OSPPSVC.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2560
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Windows\SoftwareDistribution\AuthCabs\OSPPSVC.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:680
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 5 /tr "'C:\Windows\SoftwareDistribution\AuthCabs\OSPPSVC.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1780

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        K37wJmF1HmUF8ALyjA8MpCp.bat

        • Path C:\MsSession\K37wJmF1HmUF8ALyjA8MpCp.bat
        • Size 30B
        • SHA256 1cf1a92d3e3ce17a13d4827deb0cdb9f89a40116905980b547d7f954d59040a7
        • MD5 SHA1 SHA512

        Ov1RwD.vbe

        • Path C:\MsSession\Ov1RwD.vbe
        • Size 209B
        • SHA256 3558ba240c76b6de27cdc3ac9370d6b50774aa2d5d5e3fe6a697e971e832aef9
        • MD5 SHA1 SHA512

        hyperComwin.exe

        • Path \MsSession\hyperComwin.exe
        • Size 2.3MB
        • SHA256 f6cf6f23a7d27460b34f9ead8e72584a706ae1e986f3fa3920c51fbd0d6f93d0
        • MD5 SHA1 SHA512 SSDEEP

        explorer.exe

        • Path \Users\Admin\AppData\Local\Temp\explorer.exe
        • Size 130KB
        • SHA256 af86dc3f76d39b67b967a3b714e9e70ed43eec8d3871e9691cb45d84372b53fb
        • MD5 SHA1 SHA512 SSDEEP

        svchost.exe

        • Path \Users\Admin\AppData\Local\Temp\svchost.exe
        • Size 2.6MB
        • SHA256 1594a7f6707f01d3f1688f726af842940fe96fe700f99df23a3d8ec6909e4b13
        • MD5 SHA1 SHA512 SSDEEP

        memory/1324-56-0x0000000000DD0000-0x000000000101E000-memory.dmp

        memory/1324-58-0x00000000004F0000-0x0000000000502000-memory.dmp

        memory/1324-57-0x0000000000B70000-0x0000000000BC6000-memory.dmp

        memory/2368-1-0x00000000013A0000-0x0000000001660000-memory.dmp

        memory/2368-0-0x000000007470E000-0x000000007470F000-memory.dmp

        memory/2748-29-0x0000000000250000-0x000000000026C000-memory.dmp

        memory/2748-32-0x00000000005D0000-0x00000000005E2000-memory.dmp

        memory/2748-33-0x0000000000BF0000-0x0000000000BFE000-memory.dmp

        memory/2748-31-0x0000000000390000-0x00000000003E6000-memory.dmp

        memory/2748-30-0x0000000000270000-0x0000000000286000-memory.dmp

        memory/2748-28-0x0000000000E40000-0x000000000108E000-memory.dmp