General
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Target
rufus-4.6.exe
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Size
1.5MB
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Sample
241120-hytylatglk
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MD5
8fe64da09af371b02a31828415ece8f3
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SHA1
5b5c90dcd425c814b555a4567405601aa977ee0b
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SHA256
8279696c1d78b14618500e9135886a3667b9decc65946f3729002e4bfdbb20ab
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SHA512
e49f9b1c9d33364101ad2fd4f2c5ed030700cc941bb469cf2ce7d5b32c51cab9e62b265e05cbd92435453e7e4008c9990bea532298676f7d81e5d6dcdc2f590b
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SSDEEP
24576:H8U9+A6KdMt7ZRuYfuv9dTWGNj0GvXFGfkRssBUEt3kRQrf7zSIBDICweAVdEY2Y:cUUvltf6SGd/FGfIsTE665h0dEY2nY
Behavioral task
behavioral1
Sample
rufus-4.6.exe
Resource
win11-20241007-en
Malware Config
Targets
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Target
rufus-4.6.exe
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Size
1.5MB
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MD5
8fe64da09af371b02a31828415ece8f3
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SHA1
5b5c90dcd425c814b555a4567405601aa977ee0b
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SHA256
8279696c1d78b14618500e9135886a3667b9decc65946f3729002e4bfdbb20ab
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SHA512
e49f9b1c9d33364101ad2fd4f2c5ed030700cc941bb469cf2ce7d5b32c51cab9e62b265e05cbd92435453e7e4008c9990bea532298676f7d81e5d6dcdc2f590b
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SSDEEP
24576:H8U9+A6KdMt7ZRuYfuv9dTWGNj0GvXFGfkRssBUEt3kRQrf7zSIBDICweAVdEY2Y:cUUvltf6SGd/FGfIsTE665h0dEY2nY
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Jigsaw Ransomware
Ransomware family first created in 2016. Named based on wallpaper set after infection in the early versions.
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Jigsaw family
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Suspicious use of NtCreateUserProcessOtherParentProcess
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Renames multiple (4027) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Drops file in Drivers directory
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Modifies RDP port number used by Windows
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Sets service image path in registry
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Checks BIOS information in registry
BIOS information is often read in order to detect sandboxing environments.
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Credentials from Password Stores: Windows Credential Manager
Suspicious access to Credentials History.
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Impair Defenses: Safe Mode Boot
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Adds Run key to start application
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Boot or Logon Autostart Execution: Active Setup
Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.
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Downloads MZ/PE file
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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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Indicator Removal: File Deletion
Adversaries may delete files left behind by the actions of their intrusion activity.
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Legitimate hosting services abused for malware hosting/C2
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Boot or Logon Autostart Execution: Authentication Package
Suspicious Windows Authentication Registry Modification.
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Drops file in System32 directory
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Event Triggered Execution: Component Object Model Hijacking
Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.
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Modifies WinLogon for persistence
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Sets desktop wallpaper using registry
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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
5Active Setup
1Authentication Package
1Registry Run Keys / Startup Folder
2Winlogon Helper DLL
1Event Triggered Execution
1Component Object Model Hijacking
1Privilege Escalation
Boot or Logon Autostart Execution
5Active Setup
1Authentication Package
1Registry Run Keys / Startup Folder
2Winlogon Helper DLL
1Event Triggered Execution
1Component Object Model Hijacking
1Defense Evasion
Impair Defenses
1Safe Mode Boot
1Indicator Removal
1File Deletion
1Modify Registry
7Subvert Trust Controls
2Install Root Certificate
1SIP and Trust Provider Hijacking
1Credential Access
Credentials from Password Stores
2Credentials from Web Browsers
1Windows Credential Manager
1Unsecured Credentials
1Credentials In Files
1