Analysis

  • max time kernel
    121s
  • max time network
    123s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    03-11-2024 09:57

General

  • Target

    004e2051dde231741f7be44ccc11a2ac05170785f1c2b702e8ae3ee8b3766ceeN.exe

  • Size

    952KB

  • MD5

    b86ee30e813ada623950e69411e39f20

  • SHA1

    8027da1ceaf274b125b2499404f44933ce8c1cf3

  • SHA256

    004e2051dde231741f7be44ccc11a2ac05170785f1c2b702e8ae3ee8b3766cee

  • SHA512

    c9d16edd860b01f893ee47dd65dea0ee3779015b4039a0fdf05a6567dd5ecdb87ec8012a8306e0237a0675a27e9b3db6553a10fb941336f26fd468fa85ef5fd9

  • 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 14 IoCs
  • Process spawned unexpected child process 14 IoCs

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

  • UAC bypass 3 TTPs 9 IoCs
  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 2 IoCs
  • Adds Run key to start application 2 TTPs 28 IoCs
  • Checks whether UAC is enabled 1 TTPs 6 IoCs
  • Drops file in System32 directory 33 IoCs
  • Drops file in Program Files directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 14 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 12 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\004e2051dde231741f7be44ccc11a2ac05170785f1c2b702e8ae3ee8b3766ceeN.exe
    "C:\Users\Admin\AppData\Local\Temp\004e2051dde231741f7be44ccc11a2ac05170785f1c2b702e8ae3ee8b3766ceeN.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:2092
    • C:\Users\Admin\AppData\Local\Temp\004e2051dde231741f7be44ccc11a2ac05170785f1c2b702e8ae3ee8b3766ceeN.exe
      "C:\Users\Admin\AppData\Local\Temp\004e2051dde231741f7be44ccc11a2ac05170785f1c2b702e8ae3ee8b3766ceeN.exe"
      2⤵
      • Modifies WinLogon for persistence
      • UAC bypass
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Drops file in System32 directory
      • Drops file in Program Files directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:2688
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\h3zZ5q2iML.bat"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1080
        • C:\Windows\system32\w32tm.exe
          w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
          4⤵
            PID:332
          • C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\csrss.exe
            "C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\csrss.exe"
            4⤵
            • UAC bypass
            • Executes dropped EXE
            • Checks whether UAC is enabled
            • Suspicious use of AdjustPrivilegeToken
            • System policy modification
            PID:2588
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\dcomcnfg\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2484
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\KBDINORI\dwm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2928
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\PerfLogs\Admin\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2920
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\vss_ps\lsm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2656
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0019-0409-0000-0000000FF1CE}-C\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1720
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\C_10079\dwm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:620
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files\Windows Sidebar\it-IT\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:316
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\secinit\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2796
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\NlsModels0011\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2720
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\proquota\dwm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2132
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2096
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\System32\kbd101\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2476
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\sysprep\en-US\lsm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1136
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Documents and Settings\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2604

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\PerfLogs\Admin\System.exe

      Filesize

      952KB

      MD5

      4c9ab53ca8384d9884b87b6587764d19

      SHA1

      03ba5660e6825aec2c508d21b705eecb732b742f

      SHA256

      8e74b3bff8c483b08b92ace1661ffe9d441fe095093a57c94cd5a606add772d2

      SHA512

      12f5ad5458cfcbaff3de1c2ce981fdee1f1f6fcd45fb01ca04b82809c47d947bc67dc3425c9edc255c71bfac389ee529c68b29bd3442080874b9c818bcbaf91c

    • C:\Users\Admin\AppData\Local\Temp\RCXC987.tmp

      Filesize

      952KB

      MD5

      b86ee30e813ada623950e69411e39f20

      SHA1

      8027da1ceaf274b125b2499404f44933ce8c1cf3

      SHA256

      004e2051dde231741f7be44ccc11a2ac05170785f1c2b702e8ae3ee8b3766cee

      SHA512

      c9d16edd860b01f893ee47dd65dea0ee3779015b4039a0fdf05a6567dd5ecdb87ec8012a8306e0237a0675a27e9b3db6553a10fb941336f26fd468fa85ef5fd9

    • C:\Users\Admin\AppData\Local\Temp\h3zZ5q2iML.bat

      Filesize

      222B

      MD5

      3e4a97b78b7afef013d16dc48170932a

      SHA1

      0fa2253d163f6a7890951323f2e25af6d4578bb3

      SHA256

      0caa418176eab887c49ab6c7f4e49018d770c7cfd3664e0e9cd2f777ef1d99ec

      SHA512

      fd4f6f9126d865fffc433a1f5b73ca226389f303cb91dd4e3c17715a352268b2a05cab07b943403070000de29e64bf4c50a9e0394578e43dfaefc282cd2a59bf

    • memory/2092-4-0x0000000000250000-0x0000000000260000-memory.dmp

      Filesize

      64KB

    • memory/2092-10-0x0000000000460000-0x000000000046C000-memory.dmp

      Filesize

      48KB

    • memory/2092-5-0x0000000000270000-0x000000000027A000-memory.dmp

      Filesize

      40KB

    • memory/2092-6-0x0000000000290000-0x000000000029C000-memory.dmp

      Filesize

      48KB

    • memory/2092-7-0x0000000000260000-0x000000000026A000-memory.dmp

      Filesize

      40KB

    • memory/2092-8-0x0000000000280000-0x0000000000288000-memory.dmp

      Filesize

      32KB

    • memory/2092-11-0x0000000000450000-0x000000000045C000-memory.dmp

      Filesize

      48KB

    • memory/2092-0-0x000007FEF57A3000-0x000007FEF57A4000-memory.dmp

      Filesize

      4KB

    • memory/2092-9-0x0000000000440000-0x000000000044A000-memory.dmp

      Filesize

      40KB

    • memory/2092-3-0x0000000000240000-0x0000000000250000-memory.dmp

      Filesize

      64KB

    • memory/2092-2-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

      Filesize

      9.9MB

    • memory/2092-73-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

      Filesize

      9.9MB

    • memory/2092-1-0x00000000009A0000-0x0000000000A94000-memory.dmp

      Filesize

      976KB

    • memory/2588-121-0x00000000008F0000-0x00000000009E4000-memory.dmp

      Filesize

      976KB