Analysis
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max time kernel
149s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
12-12-2024 00:27
General
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Target
936fd703d9cf5a02721ef6c3ca0f4f147c0de02580213152b3bdd86ba1a581cd.exe
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Size
952KB
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MD5
86706715807ae2b462abebd563006444
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SHA1
c47a2955878e4314c2f7e1e2b78fd9054d7d9466
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SHA256
936fd703d9cf5a02721ef6c3ca0f4f147c0de02580213152b3bdd86ba1a581cd
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SHA512
45fab92be0eba14855d9645a22bc1c2506018711b13067c160c00de70c381f7fd22f1f48b86b77fb25bb0f9c0cb4896125545831649d01227f4484fcedde7674
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SSDEEP
24576:W+O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXX:x8/KfRTK
Malware Config
Signatures
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DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
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Dcrat family
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Modifies WinLogon for persistence 2 TTPs 7 IoCs
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Process spawned unexpected child process 7 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
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UAC bypass 3 TTPs 6 IoCs
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DCRat payload 3 IoCs
Detects payload of DCRat, commonly dropped by NSIS installers.
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE 1 IoCs
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Adds Run key to start application 2 TTPs 14 IoCs
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Checks whether UAC is enabled 1 TTPs 4 IoCs
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Drops file in System32 directory 10 IoCs
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Drops file in Program Files directory 6 IoCs
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Drops file in Windows directory 5 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Modifies registry class 1 IoCs
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Scheduled Task/Job: Scheduled Task 1 TTPs 7 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious behavior: EnumeratesProcesses 3 IoCs
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Suspicious use of AdjustPrivilegeToken 2 IoCs
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Suspicious use of WriteProcessMemory 6 IoCs
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System policy modification 1 TTPs 6 IoCs
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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
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C:\Users\Admin\AppData\Local\Temp\936fd703d9cf5a02721ef6c3ca0f4f147c0de02580213152b3bdd86ba1a581cd.exe"C:\Users\Admin\AppData\Local\Temp\936fd703d9cf5a02721ef6c3ca0f4f147c0de02580213152b3bdd86ba1a581cd.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 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
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\THBYgWHxR7.bat"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:23⤵
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C:\Windows\System32\MTFServer\RuntimeBroker.exe"C:\Windows\System32\MTFServer\RuntimeBroker.exe"3⤵
- UAC bypass
- Executes dropped EXE
- Checks whether UAC is enabled
- Suspicious use of AdjustPrivilegeToken
- System policy modification
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\ProgramData\WindowsHolographicDevices\SpatialStore\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "936fd703d9cf5a02721ef6c3ca0f4f147c0de02580213152b3bdd86ba1a581cd" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\dd_NDP472-KB4054530-x86-x64-AllOS-ENU_decompression_log\936fd703d9cf5a02721ef6c3ca0f4f147c0de02580213152b3bdd86ba1a581cd.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Documents and Settings\winlogon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\MTFServer\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroLayoutRecognizer\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartUI\StartMenuExperienceHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\polprou\unsecapp.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
952KB
MD586706715807ae2b462abebd563006444
SHA1c47a2955878e4314c2f7e1e2b78fd9054d7d9466
SHA256936fd703d9cf5a02721ef6c3ca0f4f147c0de02580213152b3bdd86ba1a581cd
SHA51245fab92be0eba14855d9645a22bc1c2506018711b13067c160c00de70c381f7fd22f1f48b86b77fb25bb0f9c0cb4896125545831649d01227f4484fcedde7674
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Filesize
211B
MD51232832e1905b4fe416893284258334d
SHA163fab7124e84df946a83ca736479c49b9fc22329
SHA256cc338369874f887b4332f256d4f4a1a73b32dca54c0671650a3d72e0145b85f8
SHA51262b5a925c005002cb531f85170957b10ee41e54bac83e5d153b81f8ca6ebcf97857e1dff6447bf51910bab08f3350da4ddd30757d6f8309bf9e67bb74875ca8b
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Filesize
952KB
MD51050058d030f9d9ace7d941905207ef2
SHA18e4526ac11d46c32206bbdef0d30ef8839c6d55c
SHA256d7f5648e69e39642e050c1687a6b3a2c88eb51f5d4306b975cff4f90bbe770d2
SHA512b04520a1b4e8a3c54a58f847e274bdac3ae66ef42adb1475121e98b33d77b12aff92f870cdeddd194078636e6422175dcd27b85d944fd6c621d4117bb569b4c4
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Filesize
64KB
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Filesize
8KB
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Filesize
40KB
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Filesize
48KB
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Filesize
40KB
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Filesize
40KB
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Filesize
48KB
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Filesize
48KB
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Filesize
32KB
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Filesize
64KB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
976KB