Analysis
- max time kernel
207s - max time network
214s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
30/11/2022, 15:14
General
- Target 01B17E643E75E0D4FFEC494FC9AE2253.exe
- Size 1.8MB
- Sample221130-sme1eabc94
- SHA256 6367ba7e45c187cabf91fac6fa63d42ff02e329882788452386e5e487cdd85eb
Malware Config
Signatures
- DcRat 6 IoCs
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
- Process spawned unexpected child process 5 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
- Executes dropped EXE 2 IoCs
- Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
- Adds Run key to start application 2 TTPs 5 IoCs
- Legitimate hosting services abused for malware hosting/C2 1 TTPs
- Drops file in System32 directory 4 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Creates scheduled task(s) 1 TTPs 5 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Modifies registry class 2 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of WriteProcessMemory 16 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\01B17E643E75E0D4FFEC494FC9AE2253.exe"C:\Users\Admin\AppData\Local\Temp\01B17E643E75E0D4FFEC494FC9AE2253.exe"1⤵
- DcRat
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\GeforceTempFilesUp\CYfUm2dewebOmnzCHhQYxXCHgdiaf4.vbe"2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\GeforceTempFilesUp\YM7Fc7xHf8HAvkpMww2Iow.bat" "3⤵
- Suspicious use of WriteProcessMemory
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C:\GeforceTempFilesUp\GeforceExperience.exe"C:\GeforceTempFilesUp\GeforceExperience.exe"4⤵
- Executes dropped EXE
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell" -Command Add-MpPreference -ExclusionPath 'C:\'5⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\YSWnZi44qz.bat"5⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:26⤵
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C:\odt\RuntimeBroker.exe"C:\odt\RuntimeBroker.exe"6⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\odt\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Documents and Settings\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\wdscore\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\System32\CfgSPPolicy\sihost.exe'" /rl HIGHEST /f1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Documents and Settings\System.exe'" /rl HIGHEST /f1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
CYfUm2dewebOmnzCHhQYxXCHgdiaf4.vbe
GeforceExperience.exe
GeforceExperience.exe
YM7Fc7xHf8HAvkpMww2Iow.bat
YSWnZi44qz.bat
RuntimeBroker.exe
RuntimeBroker.exe
memory/708-167-0x00007FFC42C70000-0x00007FFC43731000-memory.dmp
memory/708-166-0x00007FFC42C70000-0x00007FFC43731000-memory.dmp
memory/708-158-0x0000017930300000-0x0000017930322000-memory.dmp
memory/896-152-0x000000001B7B5000-0x000000001B7BA000-memory.dmp
memory/896-142-0x000000001B7B9000-0x000000001B7BF000-memory.dmp
memory/896-145-0x000000001CAA0000-0x000000001CAA4000-memory.dmp
memory/896-146-0x000000001CAA4000-0x000000001CAA7000-memory.dmp
memory/896-147-0x000000001CAA0000-0x000000001CAA4000-memory.dmp
memory/896-148-0x000000001CAA4000-0x000000001CAA7000-memory.dmp
memory/896-149-0x000000001CAA7000-0x000000001CAAA000-memory.dmp
memory/896-150-0x000000001CAA7000-0x000000001CAAA000-memory.dmp
memory/896-151-0x000000001B7B5000-0x000000001B7BE000-memory.dmp
memory/896-153-0x000000001CAA1000-0x000000001CAA9000-memory.dmp
memory/896-154-0x000000001B7B5000-0x000000001B7BE000-memory.dmp
memory/896-155-0x000000001B7B5000-0x000000001B7B8000-memory.dmp
memory/896-143-0x00007FFC42C70000-0x00007FFC43731000-memory.dmp
memory/896-139-0x0000000000750000-0x00000000008C6000-memory.dmp
memory/896-144-0x000000001B7B9000-0x000000001B7BF000-memory.dmp
memory/896-141-0x00007FFC42C70000-0x00007FFC43731000-memory.dmp
memory/896-160-0x00007FFC42C70000-0x00007FFC43731000-memory.dmp
memory/896-140-0x000000001B520000-0x000000001B570000-memory.dmp
memory/896-163-0x000000001B7B5000-0x000000001B7BE000-memory.dmp
memory/896-164-0x000000001B7B5000-0x000000001B7BA000-memory.dmp
memory/896-161-0x000000001B7B9000-0x000000001B7BF000-memory.dmp
memory/896-165-0x000000001B7B5000-0x000000001B7B8000-memory.dmp
memory/4304-171-0x00007FFC42CF0000-0x00007FFC437B1000-memory.dmp