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Analysis

  • max time kernel
    119s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    15/12/2024, 22:03

General

  • Target

    1bafdc2e89ed7d118b2695ec89ccd09f0114020308b94da96d8284022e04ad11N.exe

  • Size

    952KB

  • MD5

    ea363f97b2eb4114d986a81633f21b20

  • SHA1

    5358a564395c004068ed9907cc6a0809801b8581

  • SHA256

    1bafdc2e89ed7d118b2695ec89ccd09f0114020308b94da96d8284022e04ad11

  • SHA512

    b40d208dea8daa1ada700aa93e2559f3ee2d11e8f59b38a288ef8d402a8a11eef3636dd3460d21b72bf3bca78bd2c8ebfc9690bc95e40dd79e427e1122be1096

  • SSDEEP

    24576:2+O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXX:R8/KfRTK

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Modifies WinLogon for persistence 2 TTPs 6 IoCs
  • Process spawned unexpected child process 6 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 10 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Drops file in System32 directory 10 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs
  • System policy modification 1 TTPs 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\1bafdc2e89ed7d118b2695ec89ccd09f0114020308b94da96d8284022e04ad11N.exe
    "C:\Users\Admin\AppData\Local\Temp\1bafdc2e89ed7d118b2695ec89ccd09f0114020308b94da96d8284022e04ad11N.exe"
    1⤵
    • Modifies WinLogon for persistence
    • UAC bypass
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in System32 directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:2112
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\TItgMK42dD.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1928
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:772
        • C:\PerfLogs\Admin\wininit.exe
          "C:\PerfLogs\Admin\wininit.exe"
          3⤵
          • UAC bypass
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Suspicious use of AdjustPrivilegeToken
          • System policy modification
          PID:2140
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\PerfLogs\Admin\wininit.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2724
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\PerfLogs\Admin\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2540
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\clusapi\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3020
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Recovery\1f276ee2-69f6-11ef-8b31-62cb582c238c\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2996
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\audiodg\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1716
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\PerfLogs\Admin\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3008

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\PerfLogs\Admin\wininit.exe

      Filesize

      952KB

      MD5

      f639d536abe7225c06a2bd2a0b1578bb

      SHA1

      7949648271ff732aec8cb63944debe768b2d57d6

      SHA256

      c4fe15dc29fdee48e4eca8d81cb670427689b6280e4eb3de96975781f824e40f

      SHA512

      23c5bfe789a570df99f9647d3d4417690da4e0b8a553b02b4be788df7c35df2e6b56d57534d0c6e7a58c2f7e3876397fc3396f4f48ad94c332c825c8e6844061

    • C:\Users\Admin\AppData\Local\Temp\TItgMK42dD.bat

      Filesize

      193B

      MD5

      b11c3bbd9d437416f3eac02b9a491f00

      SHA1

      721f5e0ed653de5a78d0ccaa62ed7fd0b7c9bacd

      SHA256

      47757d8f29ca55d2c0bbbc9967e628a082b86a4d22140d4a3710fa15a20d425a

      SHA512

      118c8749d623475b0f76bbabe2a0c7f2585b1c6ae5f0cab502ab68af4e0f95a59a625519af405610524a6c0405e1504d4a7d0767227665b196ffcf47164e14d8

    • C:\Windows\System32\audiodg\dllhost.exe

      Filesize

      952KB

      MD5

      ea363f97b2eb4114d986a81633f21b20

      SHA1

      5358a564395c004068ed9907cc6a0809801b8581

      SHA256

      1bafdc2e89ed7d118b2695ec89ccd09f0114020308b94da96d8284022e04ad11

      SHA512

      b40d208dea8daa1ada700aa93e2559f3ee2d11e8f59b38a288ef8d402a8a11eef3636dd3460d21b72bf3bca78bd2c8ebfc9690bc95e40dd79e427e1122be1096

    • memory/2112-4-0x0000000000400000-0x0000000000410000-memory.dmp

      Filesize

      64KB

    • memory/2112-10-0x00000000009D0000-0x00000000009DC000-memory.dmp

      Filesize

      48KB

    • memory/2112-5-0x0000000001F00000-0x0000000001F0A000-memory.dmp

      Filesize

      40KB

    • memory/2112-6-0x00000000003F0000-0x00000000003FC000-memory.dmp

      Filesize

      48KB

    • memory/2112-7-0x0000000000410000-0x000000000041A000-memory.dmp

      Filesize

      40KB

    • memory/2112-8-0x0000000002080000-0x0000000002088000-memory.dmp

      Filesize

      32KB

    • memory/2112-9-0x00000000009C0000-0x00000000009CA000-memory.dmp

      Filesize

      40KB

    • memory/2112-0-0x000007FEF5753000-0x000007FEF5754000-memory.dmp

      Filesize

      4KB

    • memory/2112-11-0x00000000009E0000-0x00000000009EC000-memory.dmp

      Filesize

      48KB

    • memory/2112-3-0x0000000000360000-0x0000000000370000-memory.dmp

      Filesize

      64KB

    • memory/2112-2-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

      Filesize

      9.9MB

    • memory/2112-1-0x0000000000A00000-0x0000000000AF4000-memory.dmp

      Filesize

      976KB

    • memory/2112-95-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

      Filesize

      9.9MB

    • memory/2140-98-0x0000000001080000-0x0000000001174000-memory.dmp

      Filesize

      976KB