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
    19-12-2024 07:28

General

  • Target

    7bdc4a94cc023cd96272ecd3d7294d01b121fce48c0a80725368c95df1a14dcb.exe

  • Size

    783KB

  • MD5

    a01ba8b94da113abb830119dad3cfc17

  • SHA1

    4ccd1d3ce62f864071afdc842f9f9e4b2a4ee0a7

  • SHA256

    7bdc4a94cc023cd96272ecd3d7294d01b121fce48c0a80725368c95df1a14dcb

  • SHA512

    35a7f30941ead4d6de05bf59193624c287ab97dc24607fb229621bbc0a3aac4102ef94dac84c2b3a088276001430c14d925e085ca788657fb81967ed7b67fe3d

  • SSDEEP

    12288:GqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqK4:G+OQbpbgsFdAyQvzSqaq8qB

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 9 IoCs

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

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

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 9 IoCs
  • Checks whether UAC is enabled 1 TTPs 2 IoCs
  • Drops file in System32 directory 20 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 9 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs
  • System policy modification 1 TTPs 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\7bdc4a94cc023cd96272ecd3d7294d01b121fce48c0a80725368c95df1a14dcb.exe
    "C:\Users\Admin\AppData\Local\Temp\7bdc4a94cc023cd96272ecd3d7294d01b121fce48c0a80725368c95df1a14dcb.exe"
    1⤵
    • UAC bypass
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in System32 directory
    • 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:1744
    • C:\Users\Admin\AppData\Local\Temp\7bdc4a94cc023cd96272ecd3d7294d01b121fce48c0a80725368c95df1a14dcb.exe
      "C:\Users\Admin\AppData\Local\Temp\7bdc4a94cc023cd96272ecd3d7294d01b121fce48c0a80725368c95df1a14dcb.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1824
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\samcli\lsass.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2576
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\wpcumi\lsm.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2336
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Windows Defender\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2740
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\mspbda\spoolsv.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2684
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\KBDNO1\lsm.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2648
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\win\explorer.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 "wininit" /sc ONLOGON /tr "'C:\Windows\System32\bidispl\wininit.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2736
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\PerfLogs\Admin\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2532
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\explorer.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2968

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Windows\System32\KBDNO1\lsm.exe

    Filesize

    783KB

    MD5

    a01ba8b94da113abb830119dad3cfc17

    SHA1

    4ccd1d3ce62f864071afdc842f9f9e4b2a4ee0a7

    SHA256

    7bdc4a94cc023cd96272ecd3d7294d01b121fce48c0a80725368c95df1a14dcb

    SHA512

    35a7f30941ead4d6de05bf59193624c287ab97dc24607fb229621bbc0a3aac4102ef94dac84c2b3a088276001430c14d925e085ca788657fb81967ed7b67fe3d

  • memory/1744-11-0x0000000000290000-0x0000000000298000-memory.dmp

    Filesize

    32KB

  • memory/1744-4-0x0000000000260000-0x0000000000268000-memory.dmp

    Filesize

    32KB

  • memory/1744-13-0x00000000004A0000-0x00000000004A8000-memory.dmp

    Filesize

    32KB

  • memory/1744-5-0x0000000000270000-0x0000000000280000-memory.dmp

    Filesize

    64KB

  • memory/1744-14-0x0000000000490000-0x0000000000498000-memory.dmp

    Filesize

    32KB

  • memory/1744-6-0x0000000000280000-0x0000000000288000-memory.dmp

    Filesize

    32KB

  • memory/1744-7-0x00000000002C0000-0x00000000002CC000-memory.dmp

    Filesize

    48KB

  • memory/1744-17-0x0000000000510000-0x0000000000518000-memory.dmp

    Filesize

    32KB

  • memory/1744-9-0x00000000002D0000-0x00000000002DA000-memory.dmp

    Filesize

    40KB

  • memory/1744-8-0x0000000000470000-0x000000000047A000-memory.dmp

    Filesize

    40KB

  • memory/1744-12-0x00000000002A0000-0x00000000002A8000-memory.dmp

    Filesize

    32KB

  • memory/1744-0-0x000007FEF5423000-0x000007FEF5424000-memory.dmp

    Filesize

    4KB

  • memory/1744-3-0x0000000000250000-0x0000000000258000-memory.dmp

    Filesize

    32KB

  • memory/1744-2-0x000007FEF5420000-0x000007FEF5E0C000-memory.dmp

    Filesize

    9.9MB

  • memory/1744-10-0x00000000002B0000-0x00000000002B8000-memory.dmp

    Filesize

    32KB

  • memory/1744-16-0x00000000004E0000-0x00000000004E8000-memory.dmp

    Filesize

    32KB

  • memory/1744-15-0x0000000000500000-0x0000000000508000-memory.dmp

    Filesize

    32KB

  • memory/1744-20-0x0000000000480000-0x0000000000488000-memory.dmp

    Filesize

    32KB

  • memory/1744-19-0x0000000000580000-0x0000000000588000-memory.dmp

    Filesize

    32KB

  • memory/1744-18-0x00000000004F0000-0x00000000004F8000-memory.dmp

    Filesize

    32KB

  • memory/1744-21-0x00000000002E0000-0x00000000002EC000-memory.dmp

    Filesize

    48KB

  • memory/1744-22-0x00000000004B0000-0x00000000004B8000-memory.dmp

    Filesize

    32KB

  • memory/1744-25-0x000007FEF5420000-0x000007FEF5E0C000-memory.dmp

    Filesize

    9.9MB

  • memory/1744-1-0x0000000000870000-0x000000000093A000-memory.dmp

    Filesize

    808KB

  • memory/1744-108-0x000007FEF5420000-0x000007FEF5E0C000-memory.dmp

    Filesize

    9.9MB