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Analysis

  • max time kernel
    95s
  • max time network
    145s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/01/2025, 01:34

General

  • Target

    71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe

  • Size

    783KB

  • MD5

    cf1bfee7761c04cb3d6bac55fd17f8e9

  • SHA1

    626a9ced8310839072e9025f576060792efcdaae

  • SHA256

    71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6

  • SHA512

    db31cca344fa6b94591b55ab6aa918058f3165f11fe8dacde5f9513e8d8057714444ceea9d25db95ac5e112309ee16874ed6957569b9a9c8420c9cc7d72dc102

  • SSDEEP

    12288:GqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqK:G+OQbpbgsFdAyQvzSqaq8q

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 7 IoCs

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

  • UAC bypass 3 TTPs 3 IoCs
  • DCRat payload 5 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 7 IoCs
  • Checks whether UAC is enabled 1 TTPs 2 IoCs
  • Drops file in System32 directory 4 IoCs
  • Drops file in Program Files directory 8 IoCs
  • Drops file in Windows directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 7 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 2 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\71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
    "C:\Users\Admin\AppData\Local\Temp\71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe"
    1⤵
    • UAC bypass
    • Checks computer location settings
    • 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
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:792
    • C:\Users\Default\fontdrvhost.exe
      "C:\Users\Default\fontdrvhost.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4224
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:460
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\tracing\smss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3768
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Program Files\Crashpad\attachments\SppExtComObj.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1420
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\7-Zip\Lang\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1068
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Documents and Settings\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2584
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Users\Default\fontdrvhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3912
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\mfh263enc\dllhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1076

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Program Files\Crashpad\attachments\SppExtComObj.exe

    Filesize

    783KB

    MD5

    9c3f0159722dc36fabce163d5cd91477

    SHA1

    401fd630467d8df43cb55ca6f88dccc63af8e1ab

    SHA256

    b0c4736a48a8988670177972338facb97007395ff6940df8c042b0dc34742c57

    SHA512

    0773174a36bb2a72a9f3fe8c2db847b8fbc2868330cd76f7a478b9d42f41695684c1ed2f3f01c7d762142c37b627b180af20483c0a4a98110714dee0d072f917

  • C:\Users\Default\fontdrvhost.exe

    Filesize

    783KB

    MD5

    bb1c975cfbc7689ee7be062eec1ec1b0

    SHA1

    96ebbe77f716c618a4e9cbe1eb512fa2e34c6ddc

    SHA256

    f8920ac2f028a22e2065235f88232ebff2c24cad4d5755ed6fa9154eeb842cab

    SHA512

    a3312018df518185dfd0c7ca4ce27138240baf05533567a00f1361e76c0c8a20d78d90745602254c0b136aba455aee7f44a4f9d5d68ead9cb54894c6543ee14e

  • C:\Users\csrss.exe

    Filesize

    783KB

    MD5

    cf1bfee7761c04cb3d6bac55fd17f8e9

    SHA1

    626a9ced8310839072e9025f576060792efcdaae

    SHA256

    71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6

    SHA512

    db31cca344fa6b94591b55ab6aa918058f3165f11fe8dacde5f9513e8d8057714444ceea9d25db95ac5e112309ee16874ed6957569b9a9c8420c9cc7d72dc102

  • memory/792-18-0x000000001B720000-0x000000001B728000-memory.dmp

    Filesize

    32KB

  • memory/792-22-0x000000001B8A0000-0x000000001B8A8000-memory.dmp

    Filesize

    32KB

  • memory/792-6-0x0000000002EC0000-0x0000000002EC8000-memory.dmp

    Filesize

    32KB

  • memory/792-7-0x0000000002ED0000-0x0000000002EDC000-memory.dmp

    Filesize

    48KB

  • memory/792-8-0x0000000002EE0000-0x0000000002EEA000-memory.dmp

    Filesize

    40KB

  • memory/792-3-0x0000000002D70000-0x0000000002D78000-memory.dmp

    Filesize

    32KB

  • memory/792-9-0x000000001B700000-0x000000001B70A000-memory.dmp

    Filesize

    40KB

  • memory/792-10-0x0000000002F10000-0x0000000002F18000-memory.dmp

    Filesize

    32KB

  • memory/792-11-0x0000000002F00000-0x0000000002F08000-memory.dmp

    Filesize

    32KB

  • memory/792-13-0x000000001B710000-0x000000001B718000-memory.dmp

    Filesize

    32KB

  • memory/792-17-0x000000001B750000-0x000000001B758000-memory.dmp

    Filesize

    32KB

  • memory/792-0-0x00007FFB411C3000-0x00007FFB411C5000-memory.dmp

    Filesize

    8KB

  • memory/792-21-0x000000001B890000-0x000000001B89C000-memory.dmp

    Filesize

    48KB

  • memory/792-4-0x0000000002D80000-0x0000000002D88000-memory.dmp

    Filesize

    32KB

  • memory/792-20-0x000000001B770000-0x000000001B778000-memory.dmp

    Filesize

    32KB

  • memory/792-19-0x000000001B760000-0x000000001B768000-memory.dmp

    Filesize

    32KB

  • memory/792-16-0x000000001B740000-0x000000001B748000-memory.dmp

    Filesize

    32KB

  • memory/792-15-0x000000001B730000-0x000000001B738000-memory.dmp

    Filesize

    32KB

  • memory/792-14-0x0000000002EF0000-0x0000000002EF8000-memory.dmp

    Filesize

    32KB

  • memory/792-12-0x0000000002F20000-0x0000000002F28000-memory.dmp

    Filesize

    32KB

  • memory/792-25-0x00007FFB411C0000-0x00007FFB41C81000-memory.dmp

    Filesize

    10.8MB

  • memory/792-26-0x00007FFB411C0000-0x00007FFB41C81000-memory.dmp

    Filesize

    10.8MB

  • memory/792-5-0x0000000002EB0000-0x0000000002EC0000-memory.dmp

    Filesize

    64KB

  • memory/792-42-0x00007FFB411C0000-0x00007FFB41C81000-memory.dmp

    Filesize

    10.8MB

  • memory/792-2-0x00007FFB411C0000-0x00007FFB41C81000-memory.dmp

    Filesize

    10.8MB

  • memory/792-1-0x0000000000B50000-0x0000000000C1A000-memory.dmp

    Filesize

    808KB

  • memory/792-148-0x00007FFB411C0000-0x00007FFB41C81000-memory.dmp

    Filesize

    10.8MB

  • memory/4224-146-0x0000000000040000-0x000000000010A000-memory.dmp

    Filesize

    808KB