Analysis
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max time kernel
94s -
max time network
96s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
21-11-2024 00:45
General
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Target
7a51c74f9e3082a8fdc5b2aa00d105ac565ed3a696b7b59ec562f0a15cf77930.exe
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Size
4.1MB
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MD5
fc12e64914d68aa8fcacfe14eac14973
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SHA1
ffb90d0353325044a8e77a1b3d32c157e522ec6e
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SHA256
7a51c74f9e3082a8fdc5b2aa00d105ac565ed3a696b7b59ec562f0a15cf77930
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SHA512
6d2ff1530504b6a3fccb9bc2fce1e0844b5d901407af185b7b9b827896cfce26ea97f230d1f68ee577cf1665a4d0d2fe5b34532634dcc2bd05d5ff2ce77fbae0
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SSDEEP
98304:cBLZABTF8Ic94u3YveXYBLZABTF8Ic94u3YveXB:cBZAB+33Y2oBZAB+33Y2x
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 6 IoCs
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Process spawned unexpected child process 6 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 12 IoCs
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Drops file in System32 directory 7 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 6 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious behavior: EnumeratesProcesses 2 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\7a51c74f9e3082a8fdc5b2aa00d105ac565ed3a696b7b59ec562f0a15cf77930.exe"C:\Users\Admin\AppData\Local\Temp\7a51c74f9e3082a8fdc5b2aa00d105ac565ed3a696b7b59ec562f0a15cf77930.exe"1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\C_1146\dllhost.exe"C:\Windows\System32\C_1146\dllhost.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\rrinstaller\lsass.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\drvsetup\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:\Windows\System32\C_1146\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 "explorer" /sc ONLOGON /tr "'C:\Windows\bootstat\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 "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\Offline Web Pages\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:\Windows\Temp\MsEdgeCrashpad\dllhost.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
4.1MB
MD5fc12e64914d68aa8fcacfe14eac14973
SHA1ffb90d0353325044a8e77a1b3d32c157e522ec6e
SHA2567a51c74f9e3082a8fdc5b2aa00d105ac565ed3a696b7b59ec562f0a15cf77930
SHA5126d2ff1530504b6a3fccb9bc2fce1e0844b5d901407af185b7b9b827896cfce26ea97f230d1f68ee577cf1665a4d0d2fe5b34532634dcc2bd05d5ff2ce77fbae0
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Filesize
48KB
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Filesize
32KB
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Filesize
344KB
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Filesize
32KB
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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