Technical Information
To ensure autorun and distribution
Sets the following service settings
- [HKLM\System\CurrentControlSet\Services\gkbstttd] 'Start' = '00000002'
- [HKLM\System\CurrentControlSet\Services\gkbstttd] 'ImagePath' = '%WINDIR%\SysWOW64\gkbstttd\wjoahnnu.exe /d"<Full path to file>"'
- [HKLM\SYSTEM\CurrentControlSet\services\gkbstttd] 'ImagePath' = '%WINDIR%\SysWOW64\gkbstttd\wjoahnnu.exe'
Creates the following services
- 'gkbstttd' %WINDIR%\SysWOW64\gkbstttd\wjoahnnu.exe /d"<Full path to file>"
- 'gkbstttd' %WINDIR%\SysWOW64\gkbstttd\wjoahnnu.exe
Malicious functions
To complicate detection of its presence in the operating system,
adds antivirus exclusion with following registry keys:
- [HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '%WINDIR%\SysWOW64\gkbstttd' = '00000000'
Executes the following
- '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="%WINDIR%\SysWOW64\svchost.exe" enable=yes>nul
Injects code into
the following system processes:
- %WINDIR%\syswow64\svchost.exe
Modifies file system
Creates the following files
- %TEMP%\wjoahnnu.exe
- %WINDIR%\syswow64\config\systemprofile:.repos
Moves the following files
- from %TEMP%\wjoahnnu.exe to %WINDIR%\syswow64\gkbstttd\wjoahnnu.exe
Deletes itself.
Network activity
Connects to
- 'va##heim.cn':443
- '18#.#.214.57':480
- '18#.#47.125.145':424
- '45.##3.201.238':424
- '18#.#47.125.146':424
- '19#.143.1.5':424
- '18#.#47.125.147':424
- '18#.#2.12.45':424
- '18#.#.214.51':424
- 'google.com':80
- 'mi##########m.mail.protection.outlook.com':25
TCP
HTTP GET requests
- http://www.google.com/
Other
- 'va##heim.cn':443
- '18#.#.214.57':480
- '18#.#47.125.145':424
- '18#.#47.125.146':424
- '18#.#47.125.147':424
- '45.##3.201.238':424
- '19#.143.1.5':424
- '18#.#2.12.45':424
- '18#.#.214.51':424
UDP
- DNS ASK va##heim.cn
- DNS ASK google.com
- DNS ASK 13#.###.#00.176.in-addr.arpa
- DNS ASK mi##########m.mail.protection.outlook.com
- DNS ASK 13#.###.#00.176.dnsbl.sorbs.net
- DNS ASK 13#.###.#00.176.bl.spamcop.net
- DNS ASK 13#.###.##0.176.zen.spamhaus.org
- DNS ASK 13#.###.###.176.sbl-xbl.spamhaus.org
- DNS ASK 13#.###.#00.176.cbl.abuseat.org
Miscellaneous
Creates and executes the following
- '%WINDIR%\syswow64\gkbstttd\wjoahnnu.exe' /d"<Full path to file>"
Executes the following
- '%WINDIR%\syswow64\cmd.exe' /C mkdir %WINDIR%\SysWOW64\gkbstttd\
- '%WINDIR%\syswow64\cmd.exe' /C move /Y "%TEMP%\wjoahnnu.exe" %WINDIR%\SysWOW64\gkbstttd\
- '%WINDIR%\syswow64\sc.exe' create gkbstttd binPath= "%WINDIR%\SysWOW64\gkbstttd\wjoahnnu.exe /d\"<Full path to file>\"" type= own start= auto DisplayName= "wifi support"
- '%WINDIR%\syswow64\sc.exe' description gkbstttd "wifi internet conection"
- '%WINDIR%\syswow64\sc.exe' start gkbstttd
- '%WINDIR%\syswow64\svchost.exe'
- '%WINDIR%\syswow64\cmd.exe' /C mkdir %WINDIR%\SysWOW64\gkbstttd\' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C move /Y "%TEMP%\wjoahnnu.exe" %WINDIR%\SysWOW64\gkbstttd\' (with hidden window)
- '%WINDIR%\syswow64\sc.exe' create gkbstttd binPath= "%WINDIR%\SysWOW64\gkbstttd\wjoahnnu.exe /d\"<Full path to file>\"" type= own start= auto DisplayName= "wifi support"' (with hidden window)
- '%WINDIR%\syswow64\sc.exe' description gkbstttd "wifi internet conection"' (with hidden window)
- '%WINDIR%\syswow64\sc.exe' start gkbstttd' (with hidden window)
- '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="%WINDIR%\SysWOW64\svchost.exe" enable=yes>nul' (with hidden window)
