General
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Target
SolaraBootstrapper.exe
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Size
9.5MB
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Sample
240722-2la5hasdpg
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MD5
81cc5781eddb3eac7b5ba88706a43cd8
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SHA1
34db4fa4cb034f23586027fa59867058a0f79d23
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SHA256
f9492af3afb78775082e480af744d660db9da8bc33c3ff63d869abf62d900f6e
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SHA512
f2bf7b780a13ecbf5d684c015c94ced7936ad8dc8437f775ea4bf63d47890ec7907f975de95dade487ef2512b8dcef067239454782fd2b32db1631f4d23d9ac4
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SSDEEP
196608:1E7JB0tYrXLW+d7UcIxptvyUQymRDSI1WCOK53Ie:1E9B0OjrdLK4J/tIe
Malware Config
Targets
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Target
SolaraBootstrapper.exe
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Size
9.5MB
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MD5
81cc5781eddb3eac7b5ba88706a43cd8
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SHA1
34db4fa4cb034f23586027fa59867058a0f79d23
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SHA256
f9492af3afb78775082e480af744d660db9da8bc33c3ff63d869abf62d900f6e
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SHA512
f2bf7b780a13ecbf5d684c015c94ced7936ad8dc8437f775ea4bf63d47890ec7907f975de95dade487ef2512b8dcef067239454782fd2b32db1631f4d23d9ac4
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SSDEEP
196608:1E7JB0tYrXLW+d7UcIxptvyUQymRDSI1WCOK53Ie:1E9B0OjrdLK4J/tIe
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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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XMRig Miner payload
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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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Downloads MZ/PE file
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.NET Reactor proctector
Detects an executable protected by an unregistered version of Eziriz's .NET Reactor.
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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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Accesses cryptocurrency files/wallets, possible credential harvesting
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Adds Run key to start application
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Blocklisted process makes network request
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Checks installed software on the system
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Enumerates connected drives
Attempts to read the root path of hard drives other than the default C: drive.
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Legitimate hosting services abused for malware hosting/C2
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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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Drops file in System32 directory
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Suspicious use of SetThreadContext
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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
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1