Analysis

  • max time kernel
    94s
  • max time network
    96s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-12-2024 18:05

General

  • Target

    73eaa2708311d2ac31d2a440146fccf8c44d4cf3f2413620aaad7ff096a8fe15.exe

  • Size

    952KB

  • MD5

    dc100730c11f4a70e5324f4a0a0358f2

  • SHA1

    561a80a6284540fe9f3c30a2495f51c9e1077ab0

  • SHA256

    73eaa2708311d2ac31d2a440146fccf8c44d4cf3f2413620aaad7ff096a8fe15

  • SHA512

    d8f497520b432fa8ebd07d39a8b922b38f1dc9a954ad9646ec46c456e4476a1e856826497a23525a33690ce464796c65db9714a86e9d6af922aecc8ee85772e6

  • SSDEEP

    24576:e+O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXXn:Z8/KfRTKN

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 8 IoCs
  • Process spawned unexpected child process 8 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 7 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 16 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Drops file in System32 directory 10 IoCs
  • Drops file in Windows directory 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 8 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 2 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\73eaa2708311d2ac31d2a440146fccf8c44d4cf3f2413620aaad7ff096a8fe15.exe
    "C:\Users\Admin\AppData\Local\Temp\73eaa2708311d2ac31d2a440146fccf8c44d4cf3f2413620aaad7ff096a8fe15.exe"
    1⤵
    • Modifies WinLogon for persistence
    • 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 Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:2600
    • C:\Windows\System32\drvsetup\dllhost.exe
      "C:\Windows\System32\drvsetup\dllhost.exe"
      2⤵
      • UAC bypass
      • Executes dropped EXE
      • Checks whether UAC is enabled
      • Suspicious use of AdjustPrivilegeToken
      • System policy modification
      PID:2384
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\drvsetup\dllhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1896
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\PerfLogs\sppsvc.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4880
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\PerfLogs\System.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 "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\KBDINPUN\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4460
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4024
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "73eaa2708311d2ac31d2a440146fccf8c44d4cf3f2413620aaad7ff096a8fe15" /sc ONLOGON /tr "'C:\Users\Admin\Local Settings\73eaa2708311d2ac31d2a440146fccf8c44d4cf3f2413620aaad7ff096a8fe15.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2312
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\resources\StartMenuExperienceHost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4992
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Users\Default\My Documents\Registry.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3024

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\PerfLogs\System.exe

    Filesize

    952KB

    MD5

    a8fe2e6e7e6377fbc7c729752e9245a0

    SHA1

    d1131a868bb54ea7fd600f12138e04c1965dc093

    SHA256

    969563ae2bb4db2c3a8b7e331b61e21c3c07f087c92b2ef441e3856ca6e425b4

    SHA512

    4e20b26759efd2f7fed9978c41c30862d96c141a5f2c9e82c13dd050e0fa37067f9f63c3122e539a4d48d45070874508efb9966de9414703eeb157a3f1d775b3

  • C:\PerfLogs\sppsvc.exe

    Filesize

    952KB

    MD5

    aa6446e759344a5c04dc8dcb19b3cdb2

    SHA1

    7c59951517334785cb6b80fdf50cd7ad7b1a9843

    SHA256

    edfa4403c727533d892d7f8b172775e8bbce2c5caf141aac373aedc1d61413a5

    SHA512

    b71bbf845197845fc21f834373390d7c85001632c2a5e46ed8d7213a6d2e1a0be3b06f866f314ec795c6bd7f0b8e3ec81f25c63dec9176509b1cfa931b969c42

  • C:\Recovery\WindowsRE\SppExtComObj.exe

    Filesize

    952KB

    MD5

    dc100730c11f4a70e5324f4a0a0358f2

    SHA1

    561a80a6284540fe9f3c30a2495f51c9e1077ab0

    SHA256

    73eaa2708311d2ac31d2a440146fccf8c44d4cf3f2413620aaad7ff096a8fe15

    SHA512

    d8f497520b432fa8ebd07d39a8b922b38f1dc9a954ad9646ec46c456e4476a1e856826497a23525a33690ce464796c65db9714a86e9d6af922aecc8ee85772e6

  • C:\Windows\System32\KBDINPUN\winlogon.exe

    Filesize

    952KB

    MD5

    f4b9b3c9933a473df7e988ce12e94f3d

    SHA1

    fb23d4549ba1f6d4b59325620b7aef47a9232220

    SHA256

    d1644ddae9148c47dd32ead25e6ade0ef66d6337faf9eee4640c4e38a1b062e9

    SHA512

    0b904474d0df2a3db6976dad1cbe837b8f5845363f8e7debf360695acc091885e7625f2083755cd82e34051e576c88c7bba8a40eef8103f8e5028d2eb6bd1ec5

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

    Filesize

    952KB

    MD5

    51267dcdd23ef450144b1f7cb7b47c59

    SHA1

    a6837f6b7d3ad755b5b9f15d75d0c34062d2bbbb

    SHA256

    d2f1b54318b653aa759c603a5ef725252b7218d2ff127a5638137ea7f1b6fc81

    SHA512

    6d85058a369c1c2696af847f5ba1dd9d3a01f94b734a0e5470b7029ab6cdbebc5c890ab987c2759be09af0077aa4ac5221b51a07f66f6096698b337ddef30949

  • memory/2384-135-0x0000000000E50000-0x0000000000F44000-memory.dmp

    Filesize

    976KB

  • memory/2600-4-0x0000000001720000-0x0000000001730000-memory.dmp

    Filesize

    64KB

  • memory/2600-7-0x0000000001730000-0x000000000173A000-memory.dmp

    Filesize

    40KB

  • memory/2600-8-0x0000000001760000-0x0000000001768000-memory.dmp

    Filesize

    32KB

  • memory/2600-9-0x0000000001770000-0x000000000177A000-memory.dmp

    Filesize

    40KB

  • memory/2600-11-0x00000000030A0000-0x00000000030AC000-memory.dmp

    Filesize

    48KB

  • memory/2600-10-0x0000000001790000-0x000000000179C000-memory.dmp

    Filesize

    48KB

  • memory/2600-5-0x00000000017B0000-0x00000000017BA000-memory.dmp

    Filesize

    40KB

  • memory/2600-6-0x0000000001710000-0x000000000171C000-memory.dmp

    Filesize

    48KB

  • memory/2600-0-0x00007FFBF2B73000-0x00007FFBF2B75000-memory.dmp

    Filesize

    8KB

  • memory/2600-3-0x0000000001700000-0x0000000001710000-memory.dmp

    Filesize

    64KB

  • memory/2600-2-0x00007FFBF2B70000-0x00007FFBF3631000-memory.dmp

    Filesize

    10.8MB

  • memory/2600-1-0x0000000000D60000-0x0000000000E54000-memory.dmp

    Filesize

    976KB

  • memory/2600-136-0x00007FFBF2B70000-0x00007FFBF3631000-memory.dmp

    Filesize

    10.8MB