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 Enterprise v15
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
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
1Scheduled Task/Job
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1File and Directory Permissions Modification
1Hide Artifacts
2Hidden Files and Directories
2Impair Defenses
3Disable or Modify Tools
3Modify Registry
11Pre-OS Boot
1Bootkit
1Virtualization/Sandbox Evasion
1