General
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Target
http://roblox.com
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Sample
250131-rsfnfsznhk
Static task
static1
URLScan task
urlscan1
Behavioral task
behavioral1
Sample
http://roblox.com
Resource
win10v2004-20250129-en
Malware Config
Extracted
crimsonrat
185.136.161.124
Extracted
C:\$Recycle.Bin\HAHTGDAQH-MANUAL.txt
gandcrab
http://gandcrabmfe6mnef.onion/a5d78aa5fd16c088
Extracted
C:\g6QpgrhJDdQZeF0\DECRYPT_YOUR_FILES.HTML
Targets
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Target
http://roblox.com
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CrimsonRAT main payload
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Crimsonrat family
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Fantom family
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Gandcrab family
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InfinityLock Ransomware
Also known as InfinityCrypt. Based on the open-source HiddenTear ransomware.
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Infinitylock family
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Troldesh family
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Renames multiple (1004) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Disables RegEdit via registry modification
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Disables Task Manager via registry modification
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Downloads MZ/PE file
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Sets service image path in registry
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Credentials from Password Stores: Windows Credential Manager
Suspicious access to Credentials History.
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Drops startup file
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Executes dropped EXE
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Impair Defenses: Safe Mode Boot
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Adds Run key to start application
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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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Modifies WinLogon
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Sets desktop wallpaper using registry
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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
3Registry Run Keys / Startup Folder
2Winlogon Helper DLL
1Privilege Escalation
Boot or Logon Autostart Execution
3Registry Run Keys / Startup Folder
2Winlogon Helper DLL
1Credential Access
Credentials from Password Stores
2Credentials from Web Browsers
1Windows Credential Manager
1Unsecured Credentials
1Credentials In Files
1