General
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Target
vir.exe
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Size
311.5MB
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Sample
240524-xa8t6sfa3s
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MD5
f5af077f2625324c96424aa8211a577f
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SHA1
1228c1fa7515e320ac8a7a9416b0496f69219d73
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SHA256
e4ee380df21f16e2c78d26a30e1b82d2d979fe860172a395cec74484a74c916a
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SHA512
b69971ee35f436dbb24e512f8dbde9901c4bacea62fc37b40f0f5312ba488f82c33110825d8fbccb05f550d69937c5c2b7d305ec09c587667a6bd67d97a5a8e7
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SSDEEP
6291456:b2qVJw+odBeWFv1k4R4b0ewZkhT4ofHwJjvZDQPf2tLSkH+dHVeVM:Sr+WeSWgfecGT4RjvqP85WAK
Behavioral task
behavioral1
Sample
vir.exe
Resource
win10v2004-20240226-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
311.5MB
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MD5
f5af077f2625324c96424aa8211a577f
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SHA1
1228c1fa7515e320ac8a7a9416b0496f69219d73
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SHA256
e4ee380df21f16e2c78d26a30e1b82d2d979fe860172a395cec74484a74c916a
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SHA512
b69971ee35f436dbb24e512f8dbde9901c4bacea62fc37b40f0f5312ba488f82c33110825d8fbccb05f550d69937c5c2b7d305ec09c587667a6bd67d97a5a8e7
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SSDEEP
6291456:b2qVJw+odBeWFv1k4R4b0ewZkhT4ofHwJjvZDQPf2tLSkH+dHVeVM:Sr+WeSWgfecGT4RjvqP85WAK
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DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
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Modifies firewall policy service
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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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Suspicious use of NtCreateUserProcessOtherParentProcess
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Identifies VirtualBox via ACPI registry values (likely anti-VM)
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Modifies boot configuration data using bcdedit
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Blocklisted process makes network request
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Downloads MZ/PE file
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Drops file in Drivers directory
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Modifies Installed Components in the registry
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Sets service image path in registry
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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 system executable filetype association
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Registers COM server for autorun
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Unexpected DNS network traffic destination
Network traffic to other servers than the configured DNS servers was detected on the DNS port.
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Adds Run key to start application
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Checks for any installed AV software in registry
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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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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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Sets desktop wallpaper using registry
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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
4Registry Run Keys / Startup Folder
4Create or Modify System Process
1Windows Service
1Event Triggered Execution
1Change Default File Association
1Pre-OS Boot
1Bootkit
1Scheduled Task/Job
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
4Registry Run Keys / Startup Folder
4Create or Modify System Process
1Windows Service
1Event Triggered Execution
1Change Default File Association
1Scheduled Task/Job
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Impair Defenses
3Disable or Modify Tools
3Modify Registry
11Pre-OS Boot
1Bootkit
1Subvert Trust Controls
1Install Root Certificate
1Virtualization/Sandbox Evasion
1