Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'csrss' = '"C:\Users\Public\Documents\My Music\csrss.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'csrss' = '"C:\Users\Public\Documents\My Music\csrss.exe"'
- [HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, "C:\Users\Public\Documents\My Music\csrss.exe"'
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'winlogon' = '"C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\winlogon.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'winlogon' = '"C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\winlogon.exe"'
- [HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, "C:\Users\Public\Documents\My Music\csrss.exe", "C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\winlogon....
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'firefox' = '"%WINDIR%\twain_32\firefox.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'firefox' = '"%WINDIR%\twain_32\firefox.exe"'
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'iexplore' = '"%ProgramFiles(x86)%\Microsoft Visual Studio 8\VSTA\Bin\1033\iexplore.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'iexplore' = '"%ProgramFiles(x86)%\Microsoft Visual Studio 8\VSTA\Bin\1033\iexplore.exe"'
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'lsass' = '"C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\lsass.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'lsass' = '"C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\lsass.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>"'
Creates or modifies the following files
- <SYSTEM32>\tasks\csrssc
- <SYSTEM32>\tasks\csrss
- <SYSTEM32>\tasks\winlogonw
- <SYSTEM32>\tasks\winlogon
- <SYSTEM32>\tasks\firefoxf
- <SYSTEM32>\tasks\firefox
- <SYSTEM32>\tasks\iexplorei
- <SYSTEM32>\tasks\iexplore
- <SYSTEM32>\tasks\lsassl
- <SYSTEM32>\tasks\lsass
- <SYSTEM32>\tasks\<File name>i
- <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:\Users\Public\Documents\My Music\csrss.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\winlogon.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath '%WINDIR%\twain_32\firefox.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath '%ProgramFiles(x86)%\Microsoft Visual Studio 8\VSTA\Bin\1033\iexplore.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath '<Full path to file>'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\lsass.exe'
Modifies file system
Creates the following files
- <Current directory>\2f463119de3a36
- %HOMEPATH%\desktop\cldfjwav.log
- %HOMEPATH%\desktop\vclukrpk.log
- %TEMP%\dnly2ucthd.bat
- %TEMP%\nvyvmuzwvl
- %HOMEPATH%\desktop\lnuwgtsn.log
- %HOMEPATH%\desktop\nxqxglxo.log
- %HOMEPATH%\desktop\fkscahsd.log
- %HOMEPATH%\desktop\skdfrxrc.log
- nul
- %TEMP%\jaf7xaojvr.bat
- %TEMP%\p501o3cayx
- %HOMEPATH%\desktop\thvpzdlo.log
- %TEMP%\5dams5ki.out
- %TEMP%\5dams5ki.0.cs
- C:\users\public\documents\my music\886983d96e3d3e
- C:\users\public\documents\my music\csrss.exe
- C:\recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\cc11b995f2a76d
- C:\recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\winlogon.exe
- %WINDIR%\twain_32\0fc223bdacedc3
- %WINDIR%\twain_32\firefox.exe
- %ProgramFiles(x86)%\microsoft visual studio 8\vsta\bin\1033\9db6e019d4f04e
- %ProgramFiles(x86)%\microsoft visual studio 8\vsta\bin\1033\iexplore.exe
- C:\recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\6203df4a6bafc7
- C:\recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\lsass.exe
- %TEMP%\5dams5ki.cmdline
- %HOMEPATH%\desktop\kybzpbfg.log
Deletes the following files
- %TEMP%\5dams5ki.0.cs
- %TEMP%\5dams5ki.out
- %TEMP%\5dams5ki.cmdline
- %TEMP%\p501o3cayx
- %TEMP%\nvyvmuzwvl
Moves the following files
- from %ProgramFiles%\microsoft office\office14\bcssync.exe to %ProgramFiles%\microsoft office\office14\bcssync.exe.exe
Network activity
Connects to
- '09#####m.nyanyash.ru':80
TCP
HTTP POST requests
- http://09#####m.nyanyash.ru/phpJavascriptJsWpdlePrivate.php
UDP
- DNS ASK 09#####m.nyanyash.ru
Miscellaneous
Creates and executes the following
- 'C:\recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\lsass.exe'
Executes the following
- '<SYSTEM32>\schtasks.exe' /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Users\Public\Documents\My Music\csrss.exe'" /f
- '<SYSTEM32>\cmd.exe' /C "%TEMP%\dnlY2uCtHd.bat"
- '<SYSTEM32>\ping.exe' -n 10 localhost
- '<SYSTEM32>\chcp.com' 65001
- '<SYSTEM32>\cmd.exe' /C "%TEMP%\JAF7XAOjvR.bat"
- '<SYSTEM32>\schtasks.exe' /create /tn "<File name>i" /sc MINUTE /mo 7 /tr "'<Full path to file>'" /rl HIGHEST /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>i" /sc MINUTE /mo 9 /tr "'<Full path to file>'" /f
- '<SYSTEM32>\schtasks.exe' /create /tn "lsassl" /sc MINUTE /mo 14 /tr "'C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\lsass.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "lsass" /sc ONLOGON /tr "'C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\lsass.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "lsassl" /sc MINUTE /mo 6 /tr "'C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\lsass.exe'" /f
- '<SYSTEM32>\schtasks.exe' /create /tn "iexplorei" /sc MINUTE /mo 9 /tr "'%ProgramFiles(x86)%\Microsoft Visual Studio 8\VSTA\Bin\1033\iexplore.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "firefoxf" /sc MINUTE /mo 11 /tr "'%WINDIR%\twain_32\firefox.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "firefox" /sc ONLOGON /tr "'%WINDIR%\twain_32\firefox.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "firefoxf" /sc MINUTE /mo 6 /tr "'%WINDIR%\twain_32\firefox.exe'" /f
- '<SYSTEM32>\schtasks.exe' /create /tn "winlogonw" /sc MINUTE /mo 12 /tr "'C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\winlogon.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "winlogon" /sc ONLOGON /tr "'C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\winlogon.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "winlogonw" /sc MINUTE /mo 11 /tr "'C:\Recovery\4d53d3aa-5835-11ef-baad-8f07b80b2fb5\winlogon.exe'" /f
- '%WINDIR%\microsoft.net\framework64\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\5dams5ki.cmdline"
- '<SYSTEM32>\schtasks.exe' /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\Users\Public\Documents\My Music\csrss.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Public\Documents\My Music\csrss.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "iexplorei" /sc MINUTE /mo 8 /tr "'%ProgramFiles(x86)%\Microsoft Visual Studio 8\VSTA\Bin\1033\iexplore.exe'" /f
- '<SYSTEM32>\schtasks.exe' /create /tn "iexplore" /sc ONLOGON /tr "'%ProgramFiles(x86)%\Microsoft Visual Studio 8\VSTA\Bin\1033\iexplore.exe'" /rl HIGHEST /f
- '%WINDIR%\microsoft.net\framework64\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\5dams5ki.cmdline"' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C "%TEMP%\JAF7XAOjvR.bat"' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C "%TEMP%\dnlY2uCtHd.bat"' (with hidden window)
