Analysis

  • max time kernel
    117s
  • max time network
    118s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    02-12-2024 03:11

General

  • Target

    fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4.exe

  • Size

    2.3MB

  • MD5

    4e69fcf73418a08fcb8b3e7e2ecb43c4

  • SHA1

    a3ecd09f65ca4e7821a0b7f8596edcd679573f5b

  • SHA256

    fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4

  • SHA512

    a6d1a2b6363ad8a560567e6c11a48f8d1bc4cdfc36474902edf39f676440be82619aae52279121a776486d0edfe7a448f0fe9707b27ae760c1d6dd0201f6adc3

  • SSDEEP

    49152:BwpUwcTZ0rUinysyVZl5LCCcG3RTXM34FIIPWYJxuQfUgtFneJ8BG5U:Bw1ctUyjTLC8puaX/neJ8BgU

Malware Config

Signatures

  • DcRat 26 IoCs

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

  • Dcrat family
  • Modifies WinLogon for persistence 2 TTPs 8 IoCs
  • 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 1 IoCs
  • Adds Run key to start application 2 TTPs 16 IoCs
  • Drops file in Program Files directory 5 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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 use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 3 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\fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4.exe
    "C:\Users\Admin\AppData\Local\Temp\fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4.exe"
    1⤵
    • DcRat
    • Modifies WinLogon for persistence
    • Adds Run key to start application
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2460
    • C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\lsm.exe
      "C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\lsm.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2984
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\MSBuild\smss.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2804
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\smss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2748
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smsss" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\MSBuild\smss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2676
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 10 /tr "'C:\Users\Admin\winlogon.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2660
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Users\Admin\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2836
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 7 /tr "'C:\Users\Admin\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2560
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4f" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2584
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2532
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4f" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2580
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 6 /tr "'C:\Windows\addins\dllhost.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3016
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\addins\dllhost.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2664
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Windows\addins\dllhost.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:348
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 11 /tr "'C:\Users\Default\taskhost.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1128
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Users\Default\taskhost.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2004
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 12 /tr "'C:\Users\Default\taskhost.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2524
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsml" /sc MINUTE /mo 9 /tr "'C:\MSOCache\All Users\{90140000-00A1-0409-0000-0000000FF1CE}-C\lsm.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:300
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-00A1-0409-0000-0000000FF1CE}-C\lsm.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:320
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsml" /sc MINUTE /mo 10 /tr "'C:\MSOCache\All Users\{90140000-00A1-0409-0000-0000000FF1CE}-C\lsm.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1396
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsml" /sc MINUTE /mo 7 /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\lsm.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2084
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\lsm.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:736
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsml" /sc MINUTE /mo 13 /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\lsm.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:884
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 14 /tr "'C:\Windows\Temp\Crashpad\attachments\lsass.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:484
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\Temp\Crashpad\attachments\lsass.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1604
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 12 /tr "'C:\Windows\Temp\Crashpad\attachments\lsass.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1228

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Default\taskhost.exe

    Filesize

    2.3MB

    MD5

    4e69fcf73418a08fcb8b3e7e2ecb43c4

    SHA1

    a3ecd09f65ca4e7821a0b7f8596edcd679573f5b

    SHA256

    fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4

    SHA512

    a6d1a2b6363ad8a560567e6c11a48f8d1bc4cdfc36474902edf39f676440be82619aae52279121a776486d0edfe7a448f0fe9707b27ae760c1d6dd0201f6adc3

  • memory/2460-6-0x0000000000290000-0x00000000002A2000-memory.dmp

    Filesize

    72KB

  • memory/2460-2-0x000007FEF5290000-0x000007FEF5C7C000-memory.dmp

    Filesize

    9.9MB

  • memory/2460-3-0x0000000000250000-0x000000000026C000-memory.dmp

    Filesize

    112KB

  • memory/2460-4-0x0000000000270000-0x0000000000286000-memory.dmp

    Filesize

    88KB

  • memory/2460-5-0x0000000000AA0000-0x0000000000AF6000-memory.dmp

    Filesize

    344KB

  • memory/2460-0-0x000007FEF5293000-0x000007FEF5294000-memory.dmp

    Filesize

    4KB

  • memory/2460-7-0x00000000002B0000-0x00000000002BE000-memory.dmp

    Filesize

    56KB

  • memory/2460-8-0x0000000000560000-0x0000000000568000-memory.dmp

    Filesize

    32KB

  • memory/2460-9-0x0000000000A10000-0x0000000000A18000-memory.dmp

    Filesize

    32KB

  • memory/2460-1-0x0000000000EF0000-0x0000000001142000-memory.dmp

    Filesize

    2.3MB

  • memory/2460-33-0x000007FEF5290000-0x000007FEF5C7C000-memory.dmp

    Filesize

    9.9MB

  • memory/2984-34-0x0000000000820000-0x0000000000A72000-memory.dmp

    Filesize

    2.3MB

  • memory/2984-35-0x00000000002A0000-0x00000000002B2000-memory.dmp

    Filesize

    72KB