Analysis
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max time kernel
93s -
max time network
95s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
25-01-2025 12:43
General
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Target
c79981b0074ac288d065d459de654d9b7003f625d76526211805decdaa94f96eN.exe
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Size
952KB
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MD5
d34faac709c42364e40c0dce2e1d8e30
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SHA1
db6740044a2f829a5a0063e3eaf8e21902cf56b3
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SHA256
c79981b0074ac288d065d459de654d9b7003f625d76526211805decdaa94f96e
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SHA512
093f1046fccad9566a6a5453afaec3f228e59598db69adc9a75665bd94cd81462bc87f392dbb2a59452d78ee8a0f6a0f30088d708bb750005b4c923fcf03403c
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SSDEEP
24576:2+O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXX:R8/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 4 IoCs
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Process spawned unexpected child process 4 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 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 8 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 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 4 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious behavior: EnumeratesProcesses 1 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\c79981b0074ac288d065d459de654d9b7003f625d76526211805decdaa94f96eN.exe"C:\Users\Admin\AppData\Local\Temp\c79981b0074ac288d065d459de654d9b7003f625d76526211805decdaa94f96eN.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
- 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\V8nVLOgUdh.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\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\TextInputHost\TextInputHost.exe"C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\TextInputHost\TextInputHost.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 "TextInputHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\TextInputHost\TextInputHost.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 "c79981b0074ac288d065d459de654d9b7003f625d76526211805decdaa94f96eN" /sc ONLOGON /tr "'C:\ProgramData\Desktop\c79981b0074ac288d065d459de654d9b7003f625d76526211805decdaa94f96eN.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 "sihost" /sc ONLOGON /tr "'C:\Windows\System32\Microsoft.Graphics.Display.DisplayEnhancementService\sihost.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 "taskhostw" /sc ONLOGON /tr "'C:\Windows\System32\KBDKYR\taskhostw.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
MD5d34faac709c42364e40c0dce2e1d8e30
SHA1db6740044a2f829a5a0063e3eaf8e21902cf56b3
SHA256c79981b0074ac288d065d459de654d9b7003f625d76526211805decdaa94f96e
SHA512093f1046fccad9566a6a5453afaec3f228e59598db69adc9a75665bd94cd81462bc87f392dbb2a59452d78ee8a0f6a0f30088d708bb750005b4c923fcf03403c
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Filesize
268B
MD5d07a9fb7f82482f6d5cf0876458c9a0a
SHA1c6751b79e102bbab81227592d346f101b8ee481f
SHA25681a35b42899f3d7808cdc41b3c137080d7d1b887c49233ed82ef17b9e075d965
SHA512e97fbb78896ff3c7ae1ab5604ba4cb93dcd911d8fc52d1a235ff3e223cb9dfec3fe0ab0785fcf520a2c27c9bd3cac16538bac874904e879347c292eb1342c4a7
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Filesize
48KB
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Filesize
64KB
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Filesize
64KB
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Filesize
40KB
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Filesize
8KB
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Filesize
40KB
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Filesize
32KB
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Filesize
48KB
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Filesize
48KB
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Filesize
40KB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
976KB