Technical Information
Malicious functions
To complicate detection of its presence in the operating system,
blocks the following features:
- User Account Control (UAC)
adds antivirus exclusion with following registry keys:
- [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '%APPDATA%\yaro5831.exe' = '00000000'
Creates and executes the following
- '' (downloaded from the Internet)
Creates and executes the following (exploit)
- '%APPDATA%\yaro5831.exe'
- '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Add-MpPreference -ExclusionPath "%APPDATA%\yaro5831.exe" -Force
Injects code into
the following user processes:
- yaro5831.exe
Searches for registry branches where third party applications store passwords
- [<HKLM>\Software\Wow6432Node\ORL\WinVNC3]
- [<HKCU>\Software\ORL\WinVNC3]
- [<HKCU>\SOFTWARE\Martin Prikryl\WinSCP 2\Sessions]
- [<HKCU>\Software\FTPWare\COREFTP\Sites]
- [<HKCU>\Software\RimArts\B2\Settings]
Reads files which store third party applications passwords
- %APPDATA%\opera software\opera stable\login data
- %LOCALAPPDATA%\google\chrome\user data\default\login data
- %APPDATA%\thunderbird\profiles.ini
- %APPDATA%\mozilla\firefox\profiles.ini
Modifies file system
Creates the following files
- %APPDATA%\yaro5831.exe
- %ALLUSERSPROFILE%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\policy.vpol
- %ALLUSERSPROFILE%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\3ccd5499-87a8-4b10-a215-608888dd3b55.vsch
- %ALLUSERSPROFILE%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\2f1a6504-0641-44cf-8bb5-3612d865f2e5.vsch
- %LOCALAPPDATA%\microsoft\vault\4bf4c442-9b8a-41a0-b380-dd4a704ddb28\policy.vpol
Network activity
Connects to
- '18#.#39.242.107':80
TCP
HTTP GET requests
- http://18#.#39.242.107/base/C5BD16DF31FD750D4764F41A46794128.html
UDP
- DNS ASK tu###inblog.com
Miscellaneous
Creates and executes the following
- '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Add-MpPreference -ExclusionPath "%APPDATA%\yaro5831.exe" -Force' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /c timeout 1' (with hidden window)
Executes the following
- '%CommonProgramFiles%\microsoft shared\equation\eqnedt32.exe' -Embedding
- '%WINDIR%\syswow64\cmd.exe' /c timeout 1
- '%WINDIR%\syswow64\timeout.exe' 1
