General
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Target
DCRatBuild.exe
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Size
3.2MB
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Sample
240728-m24dnaxcqd
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MD5
cf5d0761745d4ee36e4ec956eca8ba9d
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SHA1
0eae925855b6e661c7b9bf0f47e4ac998ddba2da
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SHA256
9b1cc99b69c9936885932acd2010c9572245a7ea290b88730738e15e3fc274bb
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SHA512
62dfb12641642727abf7b8d19ec1d614805b6135bfd1165ff93e3e0c6bfab3bb13682326f7ce15706306c5dc6b93acd7e86156d0ee9b383e5690130cced347ea
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SSDEEP
49152:UbA30MrK5MiE9IMqjwJvxyg2joIz69+8BFLlD+xUL2772M3WQf4LzNBNv:UbfKVIDY5123z69fB9lD+GL2eiWQQBNv
Behavioral task
behavioral1
Sample
DCRatBuild.exe
Resource
win7-20240705-en
Malware Config
Targets
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Target
DCRatBuild.exe
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Size
3.2MB
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MD5
cf5d0761745d4ee36e4ec956eca8ba9d
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SHA1
0eae925855b6e661c7b9bf0f47e4ac998ddba2da
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SHA256
9b1cc99b69c9936885932acd2010c9572245a7ea290b88730738e15e3fc274bb
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SHA512
62dfb12641642727abf7b8d19ec1d614805b6135bfd1165ff93e3e0c6bfab3bb13682326f7ce15706306c5dc6b93acd7e86156d0ee9b383e5690130cced347ea
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SSDEEP
49152:UbA30MrK5MiE9IMqjwJvxyg2joIz69+8BFLlD+xUL2772M3WQf4LzNBNv:UbfKVIDY5123z69fB9lD+GL2eiWQQBNv
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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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Modifies WinLogon for persistence
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Process spawned unexpected child process
This typically indicates the parent process was compromised via an exploit or macro.
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Command and Scripting Interpreter: PowerShell
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE
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Loads dropped DLL
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Looks up external IP address via web service
Uses a legitimate IP lookup service to find the infected system's external IP.
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MITRE ATT&CK Enterprise v15
Execution
Command and Scripting Interpreter
1PowerShell
1Scheduled Task/Job
1Scheduled Task
1Persistence
Boot or Logon Autostart Execution
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Impair Defenses
1Disable or Modify Tools
1Modify Registry
3