General
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Target
crashpad_handler.exe
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Size
615KB
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Sample
240818-rbs78azbqp
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MD5
9f12b93fbe757f35df3cb953a52c593f
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SHA1
74e3808a94a78ccecdee9cb8b02eb0ee23ac9a81
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SHA256
d7fdaa84062bd7594fc5fc9a9eef37afe07f25a6c2e332e88bac1b35becb4c81
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SHA512
798b46eb29f0d3f849ee1c57ed16ebd0d4fa63f9ba10edefa8a26683b5baf43afe2213f46e5da4ce391af56fb3310c89e938f48738168c48dd0718494eaef203
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SSDEEP
12288:PWHL42mwBOrsD7AVFO5rxLEuuOdfj/Tua/rRe408RIE:OUzwBUsD7AVFO5rxLEuuOdfj/Tua/9ep
Static task
static1
Behavioral task
behavioral1
Sample
crashpad_handler.exe
Resource
win10v2004-20240802-en
Malware Config
Extracted
crimsonrat
185.136.161.124
Targets
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Target
crashpad_handler.exe
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Size
615KB
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MD5
9f12b93fbe757f35df3cb953a52c593f
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SHA1
74e3808a94a78ccecdee9cb8b02eb0ee23ac9a81
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SHA256
d7fdaa84062bd7594fc5fc9a9eef37afe07f25a6c2e332e88bac1b35becb4c81
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SHA512
798b46eb29f0d3f849ee1c57ed16ebd0d4fa63f9ba10edefa8a26683b5baf43afe2213f46e5da4ce391af56fb3310c89e938f48738168c48dd0718494eaef203
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SSDEEP
12288:PWHL42mwBOrsD7AVFO5rxLEuuOdfj/Tua/rRe408RIE:OUzwBUsD7AVFO5rxLEuuOdfj/Tua/9ep
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Chimera
Ransomware which infects local and network files, often distributed via Dropbox links.
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Chimera Ransomware Loader DLL
Drops/unpacks executable file which resembles Chimera's Loader.dll.
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CrimsonRAT main payload
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Modifies WinLogon for persistence
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Renames multiple (3280) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Downloads MZ/PE file
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Modifies Windows Firewall
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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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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Checks installed software on the system
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Drops desktop.ini file(s)
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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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Modifies WinLogon
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Drops file in System32 directory
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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
3Registry Run Keys / Startup Folder
1Winlogon Helper DLL
2Create or Modify System Process
1Windows Service
1Event Triggered Execution
1Netsh Helper DLL
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
3Registry Run Keys / Startup Folder
1Winlogon Helper DLL
2Create or Modify System Process
1Windows Service
1Event Triggered Execution
1Netsh Helper DLL
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Impair Defenses
3Disable or Modify System Firewall
1Disable or Modify Tools
1Safe Mode Boot
1Modify Registry
7Subvert Trust Controls
1SIP and Trust Provider Hijacking
1