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Trojan.Siggen31.36827

Added to the Dr.Web virus database: 2025-07-03

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce] 'GrpConv' = 'grpconv -o'
Malicious functions
To complicate detection of its presence in the operating system,
blocks the following features:
  • User Account Control (UAC)
Sets a new unauthorized home page for Windows Internet Explorer.
Modifies file system
Creates the following files
  • %TEMP%\aut2f88.tmp
  • %TEMP%\2572mhahroj
  • %TEMP%\aut32c4.tmp
  • %ProgramFiles(x86)%\360\360safe\deepscan\speedmem2.hg
  • %TEMP%\aut32d4.tmp
  • D:\program files\360\360safe\deepscan\speedmem2.hg
  • %TEMP%\lcajxnt.exe
  • %TEMP%\aut3542.tmp
  • %TEMP%\1108odzjlys
  • %TEMP%\~vdvumdy.tmp
  • %HOMEPATH%\favorites\百度.url
  • %HOMEPATH%\favorites\链接\百度.url
  • %HOMEPATH%\favorites\links\百度.url
  • %HOMEPATH%\favorites\淘宝网.url
  • %HOMEPATH%\favorites\链接\淘宝网.url
  • %HOMEPATH%\favorites\links\淘宝网.url
  • %HOMEPATH%\favorites\京东商城.url
  • %HOMEPATH%\favorites\链接\京东商城.url
  • %HOMEPATH%\favorites\links\京东商城.url
  • %HOMEPATH%\favorites\天猫精选.url
  • %HOMEPATH%\favorites\链接\天猫精选.url
  • %HOMEPATH%\favorites\links\天猫精选.url
  • %HOMEPATH%\favorites\9.9包邮.url
  • %HOMEPATH%\favorites\链接\9.9包邮.url
  • %HOMEPATH%\favorites\links\9.9包邮.url
  • %HOMEPATH%\favorites\手机游戏.url
  • %HOMEPATH%\favorites\链接\手机游戏.url
  • %HOMEPATH%\favorites\links\手机游戏.url
  • %HOMEPATH%\favorites\美女图片.url
  • %HOMEPATH%\favorites\链接\美女图片.url
  • %HOMEPATH%\favorites\links\美女图片.url
  • %HOMEPATH%\favorites\女性网.url
  • %HOMEPATH%\favorites\链接\女性网.url
  • %HOMEPATH%\favorites\links\女性网.url
  • %HOMEPATH%\favorites\小游戏.url
  • %HOMEPATH%\favorites\链接\小游戏.url
  • %HOMEPATH%\favorites\links\小游戏.url
  • %HOMEPATH%\favorites\免费电影.url
  • %HOMEPATH%\favorites\链接\免费电影.url
  • %HOMEPATH%\favorites\links\免费电影.url
  • %HOMEPATH%\favorites\体育赛事.url
  • %HOMEPATH%\favorites\链接\体育赛事.url
  • %HOMEPATH%\favorites\links\体育赛事.url
  • %TEMP%\~nutfinh.inf
  • %TEMP%\ucpiruv.exe
  • %TEMP%\aut711a.tmp
  • %TEMP%\328rlgbgoy
  • %TEMP%\~vnmbwuf.tmp
  • %TEMP%\vjclilg.exe
  • %TEMP%\auta44a.tmp
  • %TEMP%\2964onnofsl
  • %TEMP%\~ygwnswd.tmp
  • %TEMP%\kncgjwm.exe
  • %TEMP%\autd6ce.tmp
  • %TEMP%\1088zosjxnm
  • %TEMP%\~youjbjb.tmp
  • %TEMP%\wzjoycr.exe
  • %TEMP%\aut9fe.tmp
  • %TEMP%\1528zwobijx
  • %TEMP%\~zlfowvt.tmp
  • %TEMP%\lozwppi.exe
  • %TEMP%\aut3cff.tmp
  • %TEMP%\2696ggwlxgx
  • %TEMP%\~wltkdwz.tmp
  • %TEMP%\~xxkygfz.inf
Deletes the following files
  • %TEMP%\aut2f88.tmp
  • %TEMP%\2572mhahroj
  • %TEMP%\aut32c4.tmp
  • %TEMP%\aut32d4.tmp
  • %TEMP%\aut3542.tmp
  • %TEMP%\1108odzjlys
  • %TEMP%\~vdvumdy.tmp
  • %TEMP%\lcajxnt.exe
  • %TEMP%\~nutfinh.inf
  • %TEMP%\aut711a.tmp
  • %TEMP%\328rlgbgoy
  • %TEMP%\~vnmbwuf.tmp
  • %TEMP%\ucpiruv.exe
  • %TEMP%\auta44a.tmp
  • %TEMP%\2964onnofsl
  • %TEMP%\~ygwnswd.tmp
  • %TEMP%\vjclilg.exe
  • %TEMP%\autd6ce.tmp
  • %TEMP%\1088zosjxnm
  • %TEMP%\~youjbjb.tmp
  • %TEMP%\kncgjwm.exe
  • %TEMP%\aut9fe.tmp
  • %TEMP%\1528zwobijx
  • %TEMP%\~zlfowvt.tmp
  • %TEMP%\wzjoycr.exe
  • %TEMP%\aut3cff.tmp
  • %TEMP%\2696ggwlxgx
  • %TEMP%\~wltkdwz.tmp
  • %TEMP%\lozwppi.exe
  • %HOMEPATH%\favorites\9.9包邮.url
  • %HOMEPATH%\favorites\links\9.9包邮.url
  • %HOMEPATH%\favorites\links\京东商城.url
  • %HOMEPATH%\favorites\links\体育赛事.url
  • %HOMEPATH%\favorites\links\免费电影.url
  • %HOMEPATH%\favorites\links\天猫精选.url
  • %HOMEPATH%\favorites\links\女性网.url
  • %HOMEPATH%\favorites\links\小游戏.url
  • %HOMEPATH%\favorites\links\手机游戏.url
  • %HOMEPATH%\favorites\links\淘宝网.url
  • %HOMEPATH%\favorites\links\百度.url
  • %HOMEPATH%\favorites\links\美女图片.url
  • %HOMEPATH%\favorites\京东商城.url
  • %HOMEPATH%\favorites\体育赛事.url
  • %HOMEPATH%\favorites\免费电影.url
  • %HOMEPATH%\favorites\天猫精选.url
  • %HOMEPATH%\favorites\女性网.url
  • %HOMEPATH%\favorites\小游戏.url
  • %HOMEPATH%\favorites\手机游戏.url
  • %HOMEPATH%\favorites\淘宝网.url
  • %HOMEPATH%\favorites\百度.url
  • %HOMEPATH%\favorites\美女图片.url
  • %HOMEPATH%\favorites\链接\9.9包邮.url
  • %HOMEPATH%\favorites\链接\京东商城.url
  • %HOMEPATH%\favorites\链接\体育赛事.url
  • %HOMEPATH%\favorites\链接\免费电影.url
  • %HOMEPATH%\favorites\链接\天猫精选.url
  • %HOMEPATH%\favorites\链接\女性网.url
  • %HOMEPATH%\favorites\链接\小游戏.url
  • %HOMEPATH%\favorites\链接\手机游戏.url
  • %HOMEPATH%\favorites\链接\淘宝网.url
  • %HOMEPATH%\favorites\链接\百度.url
  • %HOMEPATH%\favorites\链接\美女图片.url
  • %TEMP%\~xxkygfz.inf
Moves the following files
  • from %ProgramFiles(x86)%\Microsoft Office\Office14\GROOVEEX.DLL to %ProgramFiles%\Microsoft Analysis Services\office14\grooveex.dll.del
Modifies the following files
  • %LOCALAPPDATA%\microsoft\windows\explorer\explorerstartuplog_runonce.etl
  • %APPDATA%\microsoft\internet explorer\quick launch\user pinned\taskbar\desktop.ini
Substitutes the following files
  • %HOMEPATH%\favorites\百度.url
  • %HOMEPATH%\favorites\链接\百度.url
  • %HOMEPATH%\favorites\links\百度.url
  • %HOMEPATH%\favorites\淘宝网.url
  • %HOMEPATH%\favorites\链接\淘宝网.url
  • %HOMEPATH%\favorites\links\淘宝网.url
  • %HOMEPATH%\favorites\京东商城.url
  • %HOMEPATH%\favorites\链接\京东商城.url
  • %HOMEPATH%\favorites\links\京东商城.url
  • %HOMEPATH%\favorites\天猫精选.url
  • %HOMEPATH%\favorites\链接\天猫精选.url
  • %HOMEPATH%\favorites\links\天猫精选.url
  • %HOMEPATH%\favorites\9.9包邮.url
  • %HOMEPATH%\favorites\链接\9.9包邮.url
  • %HOMEPATH%\favorites\links\9.9包邮.url
  • %HOMEPATH%\favorites\手机游戏.url
  • %HOMEPATH%\favorites\链接\手机游戏.url
  • %HOMEPATH%\favorites\links\手机游戏.url
  • %HOMEPATH%\favorites\美女图片.url
  • %HOMEPATH%\favorites\链接\美女图片.url
  • %HOMEPATH%\favorites\links\美女图片.url
  • %HOMEPATH%\favorites\女性网.url
  • %HOMEPATH%\favorites\链接\女性网.url
  • %HOMEPATH%\favorites\links\女性网.url
  • %HOMEPATH%\favorites\小游戏.url
  • %HOMEPATH%\favorites\链接\小游戏.url
  • %HOMEPATH%\favorites\links\小游戏.url
  • %HOMEPATH%\favorites\免费电影.url
  • %HOMEPATH%\favorites\链接\免费电影.url
  • %HOMEPATH%\favorites\links\免费电影.url
  • %HOMEPATH%\favorites\体育赛事.url
  • %HOMEPATH%\favorites\链接\体育赛事.url
  • %HOMEPATH%\favorites\links\体育赛事.url
  • %APPDATA%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini
  • %APPDATA%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Internet Explorer.lnk
Deletes itself.
Miscellaneous
Creates and executes the following
  • '%TEMP%\lcajxnt.exe' /HomeRegAccess10
  • '%TEMP%\ucpiruv.exe' /HomeRegAccess10
  • '%TEMP%\vjclilg.exe' /HomeRegAccess10
  • '%TEMP%\kncgjwm.exe' /HomeRegAccess10
  • '%TEMP%\wzjoycr.exe' /HomeRegAccess10
  • '%TEMP%\lozwppi.exe' /HomeRegAccess10
Executes the following
  • '<SYSTEM32>\rundll32.exe' setupapi,InstallHinfSection DefaultInstall 132 %TEMP%\~nutfinh.inf
  • '<SYSTEM32>\runonce.exe' -r
  • '<SYSTEM32>\grpconv.exe' -o
  • '<SYSTEM32>\rundll32.exe' setupapi,InstallHinfSection DefaultInstall 132 %TEMP%\~xxkygfz.inf
  • '<SYSTEM32>\cmd.exe' /c %TEMP%\scratch.bat
  • '<SYSTEM32>\ping.exe' -n 0 127.0.0.1
  • '<SYSTEM32>\rundll32.exe' setupapi,InstallHinfSection DefaultInstall 132 %TEMP%\~nutfinh.inf' (with hidden window)
  • '<SYSTEM32>\rundll32.exe' setupapi,InstallHinfSection DefaultInstall 132 %TEMP%\~xxkygfz.inf' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /c %TEMP%\scratch.bat' (with hidden window)

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

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