Resubmissions

23-01-2025 15:47

250123-s8nvfavjhw 10

23-01-2025 15:44

250123-s6ya4awkgr 10

23-01-2025 15:43

250123-s6b3vswkfl 10

Analysis

  • max time kernel
    467s
  • max time network
    476s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23-01-2025 15:44

General

  • Target

    taskhostw.exe

  • Size

    1.2MB

  • MD5

    ac904ffc13b5f221270f475065687b59

  • SHA1

    ed6b4383582eae7b72064a10e33cebc6fd3690e5

  • SHA256

    963a316c03e4f88df946a43d537f6ed2d2001eaafcde40bdb52cd15104112606

  • SHA512

    9626483209d8546c835c94cfffd89e1cf6ae813730d04dfdb9b4b4019e12ee0c9166fa76fb47426251f6e669d6c63037718ffb8c8366766cadca1a9f78c91559

  • SSDEEP

    12288:URZ+IoG/n9IQxW3OBseUUT+tcYbqTHSOOJVu1SNEC8m+P1BAyrQ/ta3iruJtDwbD:u2G/nvxW3WieC2nOJVrj8m+aSDwbA9Nq

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 21 IoCs

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

  • UAC bypass 3 TTPs 9 IoCs
  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Executes dropped EXE 3 IoCs
  • Checks whether UAC is enabled 1 TTPs 6 IoCs
  • Drops file in Program Files directory 3 IoCs
  • Drops file in Windows directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

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

  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 21 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 26 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 10 IoCs
  • System policy modification 1 TTPs 9 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\taskhostw.exe
    "C:\Users\Admin\AppData\Local\Temp\taskhostw.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:2336
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\BlockBrowserWeb\73WPTP5CgKBkfusL13FoS1EalfC.vbe"
      2⤵
      • Checks computer location settings
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2228
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\BlockBrowserWeb\JLBdH8Facv2OZKr8pY7k2gD8clI.bat" "
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2348
        • C:\BlockBrowserWeb\ComfontHost.exe
          "C:\BlockBrowserWeb\ComfontHost.exe"
          4⤵
          • UAC bypass
          • Checks computer location settings
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Drops file in Program Files directory
          • Drops file in Windows directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • System policy modification
          PID:4484
          • C:\Windows\SchCache\fontdrvhost.exe
            "C:\Windows\SchCache\fontdrvhost.exe"
            5⤵
            • UAC bypass
            • Executes dropped EXE
            • Checks whether UAC is enabled
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • System policy modification
            PID:2168
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 13 /tr "'C:\BlockBrowserWeb\wininit.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3684
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\BlockBrowserWeb\wininit.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2300
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 8 /tr "'C:\BlockBrowserWeb\wininit.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2428
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 9 /tr "'C:\Windows\debug\RuntimeBroker.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2240
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\debug\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1884
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Windows\debug\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4052
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 5 /tr "'C:\Windows\Sun\Java\Deployment\conhost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3864
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Windows\Sun\Java\Deployment\conhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1744
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 14 /tr "'C:\Windows\Sun\Java\Deployment\conhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2896
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 9 /tr "'C:\Windows\SchCache\fontdrvhost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4076
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\SchCache\fontdrvhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2092
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Windows\SchCache\fontdrvhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1252
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "servicess" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Internet Explorer\it-IT\services.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2656
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\it-IT\services.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:952
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "servicess" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Internet Explorer\it-IT\services.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1352
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 10 /tr "'C:\BlockBrowserWeb\wininit.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1472
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\BlockBrowserWeb\wininit.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3624
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 7 /tr "'C:\BlockBrowserWeb\wininit.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4840
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 5 /tr "'C:\Users\Public\Pictures\sihost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1708
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Users\Public\Pictures\sihost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3928
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Users\Public\Pictures\sihost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3252
  • C:\BlockBrowserWeb\wininit.exe
    C:\BlockBrowserWeb\wininit.exe
    1⤵
    • UAC bypass
    • Executes dropped EXE
    • Checks whether UAC is enabled
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • System policy modification
    PID:4840

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\BlockBrowserWeb\73WPTP5CgKBkfusL13FoS1EalfC.vbe

    Filesize

    230B

    MD5

    fdf72c94be3290267c930fab28fbd800

    SHA1

    a0e186ec44952baf296acd483f25327b0c6f33dd

    SHA256

    4eead935013d583296ca49f8fc8b70d38b7c32e1189204629f33cead574e2dd1

    SHA512

    a59b3fe649739e5d61d116149011f8d0f19ed8b217134aabb3f2c698dd52a5ccc4b67414209772be48fe4477158ffa7ebb2097280dccf1607955f1a95d264634

  • C:\BlockBrowserWeb\ComfontHost.exe

    Filesize

    911KB

    MD5

    082141e65f26ececc48552790d6c6da4

    SHA1

    fba9667158632e2dbfa128d1fa1bd4be282e773a

    SHA256

    b49adf276a5e055ef1a3685f032701b41be76177f7f9eb85dfac2d33b5fa7c9f

    SHA512

    cbe0fef685801d436b5637a0e08df052af119284491a382d689686735ee8352d3edaa6857754f16f022a0bb43f95039bc841e4ed1e20614ea0a9976258947946

  • C:\BlockBrowserWeb\JLBdH8Facv2OZKr8pY7k2gD8clI.bat

    Filesize

    47B

    MD5

    68411cfd82c251c57e0fd3e2b6e7af03

    SHA1

    26b09d13a90b0e662d57c59dc903db51dd11a177

    SHA256

    0f31379f24cbc2ab580f9b2f77e4fa36123a732377be53d88c28546228e106d7

    SHA512

    78ba2559d614ed0dbcc2e32a5f6b9ef3d3585df4cc515728ff4cccdefbd00b50f3e34774af016a5fc9f8320ff48e963bc76f9c7b04e80ad69a43eef9c18f2f2a

  • memory/4484-12-0x00007FFB07423000-0x00007FFB07425000-memory.dmp

    Filesize

    8KB

  • memory/4484-13-0x00000000003F0000-0x00000000004DC000-memory.dmp

    Filesize

    944KB

  • memory/4484-14-0x0000000002650000-0x000000000265A000-memory.dmp

    Filesize

    40KB

  • memory/4484-15-0x000000001B0F0000-0x000000001B0FC000-memory.dmp

    Filesize

    48KB