General
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Target
vir.exe
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Size
36.2MB
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Sample
240523-25mmmsch57
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MD5
e0668c83cc66ba89747c6d676879745b
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SHA1
f55c70e669a3397f17f348f2922d54da8785e51a
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SHA256
0d7b33b18e6e288da39aaf22657d4b5894651127b68cc954ea2b00350185c34a
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SHA512
4299563811361b9600f6d31491f351ec9d5f897b2af6734021651d0a3b5bf8407b33b5f96ede1ac1d9e738cb9fee161d92ddf2c039230490da2d84a0ad9cb34f
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SSDEEP
786432:t4RerlLa3nwEwrkACTe6YQbjGEhM67HXkvj:OulW3wEoA3HUr
Behavioral task
behavioral1
Sample
vir.exe
Resource
win11-20240426-en
Malware Config
Extracted
quasar
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reconnect_delay
3000
Extracted
quasar
1.4.1
romka
jozzu420-51305.portmap.host:51305
0445c342-b551-411c-9b80-cd437437f491
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encryption_key
E1BF1D99459F04CAF668F054744BC2C514B0A3D6
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install_name
Romilyaa.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Windows 10 Boot
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subdirectory
SubDir
Targets
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Target
vir.exe
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Size
36.2MB
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MD5
e0668c83cc66ba89747c6d676879745b
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SHA1
f55c70e669a3397f17f348f2922d54da8785e51a
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SHA256
0d7b33b18e6e288da39aaf22657d4b5894651127b68cc954ea2b00350185c34a
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SHA512
4299563811361b9600f6d31491f351ec9d5f897b2af6734021651d0a3b5bf8407b33b5f96ede1ac1d9e738cb9fee161d92ddf2c039230490da2d84a0ad9cb34f
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SSDEEP
786432:t4RerlLa3nwEwrkACTe6YQbjGEhM67HXkvj:OulW3wEoA3HUr
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Modifies WinLogon for persistence
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Modifies firewall policy service
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Modifies visibility of file extensions in Explorer
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Modifies visiblity of hidden/system files in Explorer
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PrivateLoader
PrivateLoader is a downloader sold as a pay-per-install malware distribution service.
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Quasar payload
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Identifies VirtualBox via ACPI registry values (likely anti-VM)
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Blocklisted process makes network request
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Disables RegEdit via registry modification
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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 BIOS information in registry
BIOS information is often read in order to detect sandboxing environments.
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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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Loads dropped DLL
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Modifies file permissions
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Accesses Microsoft Outlook profiles
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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 Chrome extension
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Drops desktop.ini file(s)
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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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Modifies WinLogon
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Writes to the Master Boot Record (MBR)
Bootkits write to the MBR to gain persistence at a level below the operating system.
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AutoIT Executable
AutoIT scripts compiled to PE executables.
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Drops file in System32 directory
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Suspicious use of NtSetInformationThreadHideFromDebugger
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Suspicious use of SetThreadContext
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MITRE ATT&CK Matrix ATT&CK v13
Persistence
Boot or Logon Autostart Execution
3Registry Run Keys / Startup Folder
1Winlogon Helper DLL
2Create or Modify System Process
1Windows Service
1Pre-OS Boot
1Bootkit
1Scheduled Task/Job
1Privilege Escalation
Boot or Logon Autostart Execution
3Registry Run Keys / Startup Folder
1Winlogon Helper DLL
2Create or Modify System Process
1Windows Service
1Abuse Elevation Control Mechanism
1Bypass User Account Control
1Scheduled Task/Job
1Defense Evasion
Modify Registry
11Hide Artifacts
2Hidden Files and Directories
2Abuse Elevation Control Mechanism
1Bypass User Account Control
1Impair Defenses
3Disable or Modify Tools
3Virtualization/Sandbox Evasion
1File and Directory Permissions Modification
1Pre-OS Boot
1Bootkit
1