General
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Target
vir.exe
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Size
354.3MB
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Sample
240524-ng6hysfa2z
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MD5
028198369d6f746e61bb3d7a6184c903
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SHA1
c25b526a8e92cead61067e02ebd26e8f9cddeb88
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SHA256
6151b06f01ef3a359f86b907c12e92235da0d2e6434e0ffd8113d3e5630a1d0b
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SHA512
d87586f6afdf386d9e9955be82e481fd2e1c68b152d543968f9963cb9d1a494e0d06aa52b230a095e36e004a52aa602a686ae7f5ad01278280b307920ec0ddc7
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SSDEEP
6291456:rdHVoFB/L6k3TpeRNvb1UxftqCtgZm1UQOwgb27CGhugobOzmuNYk:5IR1enREXhOwr7CGh7rmuNV
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
354.3MB
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MD5
028198369d6f746e61bb3d7a6184c903
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SHA1
c25b526a8e92cead61067e02ebd26e8f9cddeb88
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SHA256
6151b06f01ef3a359f86b907c12e92235da0d2e6434e0ffd8113d3e5630a1d0b
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SHA512
d87586f6afdf386d9e9955be82e481fd2e1c68b152d543968f9963cb9d1a494e0d06aa52b230a095e36e004a52aa602a686ae7f5ad01278280b307920ec0ddc7
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SSDEEP
6291456:rdHVoFB/L6k3TpeRNvb1UxftqCtgZm1UQOwgb27CGhugobOzmuNYk:5IR1enREXhOwr7CGh7rmuNV
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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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Command and Scripting Interpreter: PowerShell
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
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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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Adds Run key to start application
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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