Analysis
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max time kernel
35s -
max time network
38s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
23-11-2024 19:41
General
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Target
6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
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Size
2.1MB
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MD5
3a32de4764e961e8726b94606a07b57a
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SHA1
8489600185b3ce974e4003f9ee37abde5a0f5da2
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SHA256
6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc
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SHA512
e97a903b23d8d18553f7f7bbb474644f1ef89c5122822d404bcb4e740cbc9763d504b4241367a5beaa49ec6f6181734ae59c8bfba2119ba6e632866816434f08
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SSDEEP
24576:zZxyxNwUMrdtki6lbi5YH63JUKUwcp4TOQdXzzBNhL+Ll8HOiD7Kl4kup3B2ngov:SHwLrdtkbaCwcp4RXL7D764zB2qHG
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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DCRat payload 2 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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Drops file in System32 directory 2 IoCs
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Drops file in Program Files directory 5 IoCs
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Drops file in Windows directory 4 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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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 2 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\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe"C:\Users\Admin\AppData\Local\Temp\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe"1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- 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
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C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.bg-bg\OfficeClickToRun.exe"C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.bg-bg\OfficeClickToRun.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.bg-bg\OfficeClickToRun.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 "explorer" /sc ONLOGON /tr "'C:\Windows\bfsvc\explorer.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:\Program Files\Windows Security\unsecapp.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 "SppExtComObj" /sc ONLOGON /tr "'C:\Windows\System32\CIRCoInst\SppExtComObj.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 "SppExtComObj" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SppExtComObj.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 "Idle" /sc ONLOGON /tr "'C:\PerfLogs\Idle.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 "dwm" /sc ONLOGON /tr "'C:\Windows\Tasks\dwm.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
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
2.1MB
MD53a32de4764e961e8726b94606a07b57a
SHA18489600185b3ce974e4003f9ee37abde5a0f5da2
SHA2566b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc
SHA512e97a903b23d8d18553f7f7bbb474644f1ef89c5122822d404bcb4e740cbc9763d504b4241367a5beaa49ec6f6181734ae59c8bfba2119ba6e632866816434f08
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Filesize
8KB
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Filesize
2.1MB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
32KB
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Filesize
48KB
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Filesize
56KB
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Filesize
344KB
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Filesize
32KB
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Filesize
32KB
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Filesize
32KB
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Filesize
48KB
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Filesize
32KB