Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'services' = '"%LOCALAPPDATA%\services.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'services' = '"%LOCALAPPDATA%\services.exe"'
- [HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, "%LOCALAPPDATA%\services.exe"'
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] '<File name>' = '"<Full path to file>"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] '<File name>' = '"<Full path to file>"'
- [HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, "%LOCALAPPDATA%\services.exe", "<Full path to file>"'
Creates or modifies the following files
- <SYSTEM32>\tasks\servicess
- <SYSTEM32>\tasks\services
- <SYSTEM32>\tasks\<File name>c
- <SYSTEM32>\tasks\<File name>
Malicious functions
To complicate detection of its presence in the operating system,
adds antivirus exclusion:
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/$Recycle.Bin/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Documents and Settings/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/MSOCache/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/kms/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/PerfLogs/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Program Files/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Program Files (x86)/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/ProgramData/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Recovery/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/System Volume Information/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/ucmlam/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Users/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Windows/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath '%LOCALAPPDATA%\services.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath '<Full path to file>'
Modifies file system
Creates the following files
- <Current directory>\a9562fcc3010ad
- %LOCALAPPDATA%\services.exe
- %LOCALAPPDATA%\c5b4cb5e9653cc
- %TEMP%\g3wxrzlb.0.cs
- %TEMP%\g3wxrzlb.cmdline
- %TEMP%\g3wxrzlb.out
- %TEMP%\ttghd19xyf
- %TEMP%\jsk6uo5gv2.bat
- nul
Deletes the following files
- %TEMP%\g3wxrzlb.cmdline
- %TEMP%\g3wxrzlb.out
- %TEMP%\g3wxrzlb.0.cs
- %TEMP%\ttghd19xyf
Moves the following files
- from %ProgramFiles%\microsoft office\office14\bcssync.exe to %ProgramFiles%\microsoft office\office14\bcssync.exe.exe
Miscellaneous
Restarts the analyzed sample
Executes the following
- '<SYSTEM32>\schtasks.exe' /create /tn "servicess" /sc MINUTE /mo 7 /tr "'%LOCALAPPDATA%\services.exe'" /f
- '<SYSTEM32>\schtasks.exe' /create /tn "services" /sc ONLOGON /tr "'%LOCALAPPDATA%\services.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "servicess" /sc MINUTE /mo 6 /tr "'%LOCALAPPDATA%\services.exe'" /rl HIGHEST /f
- '%WINDIR%\microsoft.net\framework64\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\g3wxrzlb.cmdline"
- '<SYSTEM32>\schtasks.exe' /create /tn "<File name>c" /sc MINUTE /mo 11 /tr "'<Full path to file>'" /f
- '<SYSTEM32>\schtasks.exe' /create /tn "<File name>" /sc ONLOGON /tr "'<Full path to file>'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "<File name>c" /sc MINUTE /mo 13 /tr "'<Full path to file>'" /rl HIGHEST /f
- '<SYSTEM32>\cmd.exe' /C "%TEMP%\jSk6UO5gV2.bat"
- '<SYSTEM32>\chcp.com' 65001
- '<SYSTEM32>\ping.exe' -n 10 localhost
- '%WINDIR%\microsoft.net\framework64\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\g3wxrzlb.cmdline"' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C "%TEMP%\jSk6UO5gV2.bat"' (with hidden window)
