Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [HKLM\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run] 'MHelper' = '%WINDIR%\MHelper.exe'
Creates or modifies the following files
- <SYSTEM32>\tasks\winupdate_login
- <SYSTEM32>\tasks\winupdate
Malicious functions
To complicate detection of its presence in the operating system,
blocks the following features:
- User Account Control (UAC)
modifies the following system settings:
- DNS server to '<DNS_SERVER>'
- DNS server to '103.1.249.209'
Modifies file system
Creates the following files
- %LOCALAPPDATA%\microsoft\windows\actioncentercache\windows-systemtoast-securityandmaintenance_10_0.png
- %WINDIR%\machineid.db
- %WINDIR%\gmon.dll
- %WINDIR%\mmc.upt
- %WINDIR%\initial.dll
- %WINDIR%\vmprotectsdk32.dll
Network activity
Connects to
- 'or###.kro.kr':80
- '10#.#.249.209':20001
- '10#.#.249.40':6200
TCP
HTTP GET requests
- http://or###.kro.kr/
Other
- '<DNS_SERVER>':53
UDP
- DNS ASK or###.kro.kr
- DNS ASK microsoft.com
- '10#.#.249.209':7001
Miscellaneous
Searches for the following windows
- ClassName: '' WindowName: '한게임 로우바둑이'
- ClassName: '' WindowName: '한게임 7포커'
- ClassName: '' WindowName: '한게임 라스베가스 포커'
- ClassName: '' WindowName: '하이로우2'
- ClassName: '' WindowName: '한게임 맞포커'
- ClassName: '' WindowName: '한게임 파티훌라'
- ClassName: '' WindowName: '피망 로우바둑이'
- ClassName: '' WindowName: '피망 7포커'
- ClassName: '' WindowName: '피망 뉴포커'
- ClassName: '' WindowName: '피망 하이로우'
- ClassName: '' WindowName: '피망 훌라'
- ClassName: '' WindowName: '피망 맞고'
- ClassName: '' WindowName: '피망 뉴맞고'
- ClassName: '' WindowName: '피망 섯다'
- ClassName: '' WindowName: '피망 고스톱'
- ClassName: '' WindowName: '넷마블 7포커'
- ClassName: '' WindowName: '넷마블 로우바둑이'
- ClassName: '' WindowName: '넷마블 뉴포커'
- ClassName: '' WindowName: '넷마블 하이로우'
- ClassName: '' WindowName: '넷마블 섯다'
- ClassName: '' WindowName: '넷마블 훌라'
- ClassName: '' WindowName: '게임 클라이언트'
- ClassName: 'CXG_WNDCLASS' WindowName: ''
- ClassName: '' WindowName: '홀덤'
- ClassName: '' WindowName: '선파워 홀덤'
- ClassName: '' WindowName: '바둑이게임'
- ClassName: '' WindowName: '포커게임'
- ClassName: '' WindowName: '맞고게임'
- ClassName: '' WindowName: 'NEW VONGVONG BADUKI'
- ClassName: '' WindowName: 'NEW VONGVONG MATGO'
- ClassName: '' WindowName: 'Baduki'
- ClassName: '' WindowName: 'PlusPoker'
- ClassName: '' WindowName: 'Matgo'
- ClassName: '' WindowName: '쓰리랑게임'
- ClassName: '' WindowName: '올스타즈 게임'
- ClassName: '' WindowName: '로우 바둑이'
- ClassName: '' WindowName: '맞고'
- ClassName: '' WindowName: '포커'
- ClassName: '' WindowName: '팟스타게임 대기실'
- ClassName: '' WindowName: '레이스게임'
- ClassName: 'IEFrame' WindowName: ''
Executes the following
- '%WINDIR%\syswow64\schtasks.exe' /delete /tn winupdate_login /F
- '%WINDIR%\syswow64\schtasks.exe' /create /tn winupdate_login /RL HIGHEST /sc onlogon /f /tr "rundll32.exe %WINDIR%\mmc.upt,RunService"
- '%WINDIR%\syswow64\schtasks.exe' /delete /tn winupdate /F
- '%WINDIR%\syswow64\schtasks.exe' /create /tn winupdate /RL HIGHEST /sc minute /mo 5 /f /tr "rundll32.exe %WINDIR%\mmc.upt,RunService"
- '%WINDIR%\syswow64\rundll32.exe' %WINDIR%\mmc.upt,RunService
- '%WINDIR%\syswow64\netsh.exe' interface ip set dns "Ethernet 2" static 8.#.8.8 PRIMARY
- '%WINDIR%\syswow64\netsh.exe' interface ip add dns "Ethernet 2" 8.#.4.4 2
- '%WINDIR%\syswow64\netsh.exe' interface ip add dns "Ethernet 2" 10#.#.249.209 3
- '%WINDIR%\syswow64\schtasks.exe' /delete /tn winupdate_login /F' (with hidden window)
- '%WINDIR%\syswow64\schtasks.exe' /create /tn winupdate_login /RL HIGHEST /sc onlogon /f /tr "rundll32.exe %WINDIR%\mmc.upt,RunService"' (with hidden window)
- '%WINDIR%\syswow64\schtasks.exe' /delete /tn winupdate /F' (with hidden window)
- '%WINDIR%\syswow64\schtasks.exe' /create /tn winupdate /RL HIGHEST /sc minute /mo 5 /f /tr "rundll32.exe %WINDIR%\mmc.upt,RunService"' (with hidden window)
- '%WINDIR%\syswow64\rundll32.exe' %WINDIR%\mmc.upt,RunService' (with hidden window)
- '%WINDIR%\syswow64\netsh.exe' interface ip set dns "Ethernet 2" static 8.#.8.8 PRIMARY' (with hidden window)
- '%WINDIR%\syswow64\netsh.exe' interface ip add dns "Ethernet 2" 8.#.4.4 2' (with hidden window)
- '%WINDIR%\syswow64\netsh.exe' interface ip add dns "Ethernet 2" 10#.#.249.209 3' (with hidden window)
