Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Puwyk' = '%APPDATA%\Mra\Update\splash_banner\upsZXhuw\xpsrchvw.exe'
Creates or modifies the following files
- <SYSTEM32>\tasks\ballwkxxr
- %APPDATA%\Microsoft\windows\Start Menu\programs\startup\mwbgxnqfyxe.lnk
Malicious functions
Executes the following
- '<SYSTEM32>\netsh.exe' advfirewall firewall add rule name="Core Networking - Multicast Listener Done (ICMPv4-In)" program="%WINDIR%\Explorer.EXE" dir=in action=allow protocol=TCP localport=any
Injects code into
the following system processes:
- %WINDIR%\explorer.exe
Terminates or attempts to terminate
the following system processes:
- <SYSTEM32>\notepad.exe
- <SYSTEM32>\xpsrchvw.exe
- <SYSTEM32>\slui.exe
the following user processes:
- firefox.exe
- iexplore.exe
Modifies file system
Creates the following files
- %LOCALAPPDATA%\b6xfvnx\version.dll
- %LOCALAPPDATA%\b6xfvnx\notepad.exe
- %APPDATA%\microsoft\windows\start menu\programs\dzh2haa\version.dll
- %APPDATA%\microsoft\windows\start menu\programs\dzh2haa\notepad.exe
- %LOCALAPPDATA%\x1qpcuqjr\winmm.dll
- %LOCALAPPDATA%\x1qpcuqjr\xpsrchvw.exe
- %APPDATA%\mra\update\splash_banner\upszxhuw\winmm.dll
- %APPDATA%\mra\update\splash_banner\upszxhuw\xpsrchvw.exe
- %LOCALAPPDATA%\zheif\winbrand.dll
- %LOCALAPPDATA%\zheif\slui.exe
- %APPDATA%\microsoft\dbgclr\ualsjb\winbrand.dll
- %APPDATA%\microsoft\dbgclr\ualsjb\slui.exe
Deletes the following files
- %LOCALAPPDATA%\b6xfvnx\notepad.exe
- %LOCALAPPDATA%\b6xfvnx\version.dll
- %LOCALAPPDATA%\x1qpcuqjr\winmm.dll
- %LOCALAPPDATA%\x1qpcuqjr\xpsrchvw.exe
- %LOCALAPPDATA%\zheif\slui.exe
- %LOCALAPPDATA%\zheif\winbrand.dll
Modifies the following files
- %APPDATA%\microsoft\crypto\rsa\s-1-5-21-1960123792-2022915161-3775307078-1001\f58155b4b1d5a524ca0261c3ee99fb50_36d1130a-ac2e-44f7-9dc1-e424fbcbe0ee
Substitutes the following files
- %APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-1960123792-2022915161-3775307078-1001\f58155b4b1d5a524ca0261c3ee99fb50_36d1130a-ac2e-44f7-9dc1-e424fbcbe0ee
Miscellaneous
Creates and executes the following
- '%LOCALAPPDATA%\b6xfvnx\notepad.exe'
- '%LOCALAPPDATA%\x1qpcuqjr\xpsrchvw.exe'
- '%LOCALAPPDATA%\zheif\slui.exe'
- '<SYSTEM32>\netsh.exe' advfirewall firewall add rule name="Core Networking - Multicast Listener Done (ICMPv4-In)" program="%WINDIR%\Explorer.EXE" dir=in action=allow protocol=TCP localport=any' (with hidden window)
