General
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Target
https://go.microsoft.com/fwlink/?linkid=2171764
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Sample
230407-v8vzvsbh21
Malware Config
Targets
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Target
https://go.microsoft.com/fwlink/?linkid=2171764
Score10/10-
BazarBackdoor
Stealthy backdoor targeting corporate networks, believed to be developed by Trickbot's authors.
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Modifies WinLogon for persistence
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Suspicious use of NtCreateProcessExOtherParentProcess
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Suspicious use of NtCreateUserProcessOtherParentProcess
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Bazar/Team9 Backdoor payload
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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 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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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE
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Loads dropped DLL
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Reads user/profile data of web browsers
Infostealers often target stored browser data, which can include saved credentials etc.
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Registers COM server for autorun
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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 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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Installs/modifies Browser Helper Object
BHOs are DLL modules which act as plugins for Internet Explorer.
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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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Checks system information in the registry
System information is often read in order to detect sandboxing environments.
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Drops file in System32 directory
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