Technical Information
To ensure autorun and distribution
Sets the following service settings
- [HKLM\System\CurrentControlSet\Services\kytdskbz] 'Start' = '00000002'
- [HKLM\System\CurrentControlSet\Services\kytdskbz] 'ImagePath' = '%WINDIR%\SysWOW64\kytdskbz\nnhhrkdi.exe /d"<Full path to file>"'
- [HKLM\SYSTEM\CurrentControlSet\services\kytdskbz] 'ImagePath' = '%WINDIR%\SysWOW64\kytdskbz\nnhhrkdi.exe'
Creates the following services
- 'kytdskbz' %WINDIR%\SysWOW64\kytdskbz\nnhhrkdi.exe /d"<Full path to file>"
- 'kytdskbz' %WINDIR%\SysWOW64\kytdskbz\nnhhrkdi.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\kytdskbz' = '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%\nnhhrkdi.exe
- %WINDIR%\syswow64\config\systemprofile:.repos
Moves the following files
- from %TEMP%\nnhhrkdi.exe to %WINDIR%\syswow64\kytdskbz\nnhhrkdi.exe
Deletes itself.
Network activity
Connects to
- 'va##heim.cn':443
- 'ap#.vk.com':443
- 'ap#.de.fi':443
- 'ac####t.xiaomi.com':443
- 'fi#####.wpengine.com':443
- 'he###r.uk.to':443
- 'mi##########m.mail.protection.outlook.com':25
- 'or###etrica.hu':443
- 'li###arie.es':443
- 'et#####kexplorer.com':443
- 'wa#####.mbbsolutions.tech':443
- 'oa###.vk.com':443
- 'google.com':80
- '18#.#.214.51':422
- '18#.#.214.50':422
- '18#.#47.125.147':422
- '19#.143.1.5':422
- '18#.#47.125.146':422
- '45.##3.201.238':422
- '18#.#47.125.145':422
- '18#.#.214.57':486
- 'in###gram.com':443
- 'et#####ok.guarda.com':443
TCP
HTTP GET requests
- http://www.google.com/
Other
- 'va##heim.cn':443
- 'ap#.vk.com':443
- 'ap#.de.fi':443
- 'ac####t.xiaomi.com':443
- 'fi#####.wpengine.com':443
- 'he###r.uk.to':443
- 'or###etrica.hu':443
- 'li###arie.es':443
- 'et#####kexplorer.com':443
- 'oa###.vk.com':443
- '18#.#.214.51':422
- '18#.#.214.50':422
- '45.##3.201.238':422
- '18#.#47.125.147':422
- '19#.143.1.5':422
- '18#.#47.125.146':422
- '18#.#47.125.145':422
- '18#.#.214.57':486
- 'wa#####.mbbsolutions.tech':443
- 'et#####ok.guarda.com':443
UDP
- DNS ASK va##heim.cn
- DNS ASK 13#.###.#00.176.cbl.abuseat.org
- DNS ASK 13#.###.###.176.sbl-xbl.spamhaus.org
- DNS ASK 13#.###.##0.176.zen.spamhaus.org
- DNS ASK ap#.vk.com
- DNS ASK ap#.de.fi
- DNS ASK 13#.###.#00.176.bl.spamcop.net
- DNS ASK 13#.###.#00.176.dnsbl.sorbs.net
- DNS ASK ac####t.xiaomi.com
- DNS ASK wa#####.mbbsolutions.tech
- DNS ASK fi#####.wpengine.com
- DNS ASK mi##########m.mail.protection.outlook.com
- DNS ASK or###etrica.hu
- DNS ASK li###arie.es
- DNS ASK 13#.###.#00.176.in-addr.arpa
- DNS ASK et#####kexplorer.com
- DNS ASK oa###.vk.com
- DNS ASK in###gram.com
- DNS ASK google.com
- DNS ASK he###r.uk.to
- DNS ASK et#####ok.guarda.com
Miscellaneous
Creates and executes the following
- '%WINDIR%\syswow64\kytdskbz\nnhhrkdi.exe' /d"<Full path to file>"
Executes the following
- '%WINDIR%\syswow64\cmd.exe' /C mkdir %WINDIR%\SysWOW64\kytdskbz\
- '%WINDIR%\syswow64\cmd.exe' /C move /Y "%TEMP%\nnhhrkdi.exe" %WINDIR%\SysWOW64\kytdskbz\
- '%WINDIR%\syswow64\sc.exe' create kytdskbz binPath= "%WINDIR%\SysWOW64\kytdskbz\nnhhrkdi.exe /d\"<Full path to file>\"" type= own start= auto DisplayName= "wifi support"
- '%WINDIR%\syswow64\sc.exe' description kytdskbz "wifi internet conection"
- '%WINDIR%\syswow64\sc.exe' start kytdskbz
- '%WINDIR%\syswow64\svchost.exe'
- '%WINDIR%\syswow64\cmd.exe' /C mkdir %WINDIR%\SysWOW64\kytdskbz\' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C move /Y "%TEMP%\nnhhrkdi.exe" %WINDIR%\SysWOW64\kytdskbz\' (with hidden window)
- '%WINDIR%\syswow64\sc.exe' create kytdskbz binPath= "%WINDIR%\SysWOW64\kytdskbz\nnhhrkdi.exe /d\"<Full path to file>\"" type= own start= auto DisplayName= "wifi support"' (with hidden window)
- '%WINDIR%\syswow64\sc.exe' description kytdskbz "wifi internet conection"' (with hidden window)
- '%WINDIR%\syswow64\sc.exe' start kytdskbz' (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)