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计算机病毒事件调查

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教育培训

误区

有关反病毒软件的误区

Trojan.Siggen31.4861

Added to the Dr.Web virus database: 2025-03-29

Virus description added: 2025-03-30

Technical Information

To ensure autorun and distribution

Modifies the following registry keys

[HKCU\Control Panel\Desktop\] 'SCRNSAVE.EXE' = '<SYSTEM32>\HALLOE~1.SCR'
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run\] 'Kleraz' = '%WINDIR%\Kl3r4z.exe'
[HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\] 'SrvcStrtuser' = '%HOMEPATH%\Local Settings\WINDOWS\SYSTEM32\LSASS.EXE'
[HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\] 'SysServc' = '%HOMEPATH%\Local Settings\WINDOWS\SYSTEM32\SERVICE.EXE'
[HKLM\Software\Classes\exefile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run\] 'MSMSGS' = '%HOMEPATH%\Local Settings\WINDOWS\SYSTEM32\LSASS.EXE'
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run\] 'SettingsServiceuser' = '%HOMEPATH%\Local Settings\WINDOWS\SYSTEM32\SMSS.EXE'
[HKLM\Software\Classes\lnkfile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[HKLM\Software\Classes\piffile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[HKLM\Software\Classes\batfile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[HKLM\Software\Classes\comfile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[HKLM\Software\Classes\docfile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[HKLM\Software\Classes\xlsfile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'

Creates the following files on removable media

<Drive name for removable media>:\top bugil.exe
<Drive name for removable media>:\boot.exe
<Drive name for removable media>:\autorun.inf
<Drive name for removable media>:\desktop.ini
<Drive name for removable media>:\settings\folder.htt
<Drive name for removable media>:\data penting\kumpulan password bank.exe
<Drive name for removable media>:\data penting\kumpulan poto bugil.exe
<Drive name for removable media>:\kumpulan puisi.exe
<Drive name for removable media>:\kumpulan poto.exe
<Drive name for removable media>:\system volume informations\folder.htt
<Drive name for removable media>:\settings.ini
<Drive name for removable media>:\system volume informations\kl3r4z.exe
<Drive name for removable media>:\tools hacker.exe
<Drive name for removable media>:\rahasiaku.exe
<Drive name for removable media>:\antivirus terbaru.exe
<Drive name for removable media>:\cerita keren.exe
<Drive name for removable media>:\settings\root.exe
<Drive name for removable media>:\data user.exe

Malicious functions

To complicate detection of its presence in the operating system,

forces the system hide from view:

hidden files
file extensions

blocks the following features:

System Restore (SR)

modifies the following system settings:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\] 'NoFolderOptions' = '00000001'
[HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Policies\Explorer\] 'NoFolderOptions' = '00000001'

Modifies settings of Windows Internet Explorer

[HKCU\Software\Microsoft\Internet Explorer\Main] 'Window Title' = ' :: SaNgKaboT #VM ComMuNiTy ::'

Sets a new unauthorized home page for Windows Internet Explorer.

Modifies file system

Creates the following files

C:\data penting\kumpulan poto bugil.exe
D:\data user.exe
D:\settings\root.exe
C:\data user.exe
C:\settings\root.exe
%WINDIR%\syswow64\shell.exe
C:\kl3r4z.exe
%HOMEPATH%\local settings\windows\system32\pesan kleraz.html
%WINDIR%\kl3r4z.exe
%HOMEPATH%\local settings\application data\lsass.exe
%HOMEPATH%\local settings\application data\smss.exe
C:\autoexec.bat
%WINDIR%\syswow64\halloewean.scr
%WINDIR%\hjransav.bat
D:\boot.exe
D:\autorun.inf
D:\desktop.ini
D:\settings\folder.htt
D:\data penting\kumpulan password bank.exe
D:\data penting\kumpulan poto bugil.exe
C:\boot.exe
C:\autorun.inf
C:\desktop.ini
C:\settings\folder.htt
C:\data penting\kumpulan password bank.exe
C:\pesan kleraz.html
%WINDIR%\syswow64\expiorer.exe

Sets the 'hidden' attribute to the following files

<Drive name for removable media>:\settings.ini
<Drive name for removable media>:\system volume informations\folder.htt
C:\settings\folder.htt
C:\desktop.ini
D:\settings\folder.htt
D:\desktop.ini
<Drive name for removable media>:\settings\folder.htt
<Drive name for removable media>:\desktop.ini
C:\autorun.inf
D:\autorun.inf
<Drive name for removable media>:\autorun.inf
C:\kl3r4z.exe
%WINDIR%\kl3r4z.exe

Network activity

Connects to

'ya##o.com':80

UDP

DNS ASK kl####.110mb.com
DNS ASK ya##o.com

Miscellaneous

Searches for the following windows

ClassName: 'RegEdit_RegEdit' WindowName: ''
ClassName: '' WindowName: 'Registry Editor'
ClassName: '' WindowName: 'Folder Options'
ClassName: '' WindowName: 'Local Settings'
ClassName: 'ExploreWClass' WindowName: ''
ClassName: 'CabinetWClass' WindowName: ''
ClassName: 'RebarWindow32' WindowName: ''
ClassName: 'ComboBoxEx32' WindowName: ''
ClassName: 'ComboBox' WindowName: ''
ClassName: 'Edit' WindowName: ''
ClassName: '#32770' WindowName: ''

Creates and executes the following

'%WINDIR%\kl3r4z.exe'
'%WINDIR%\syswow64\shell.exe'

Curing recommendations

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.
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.

Download Dr.Web

Download by serial number

Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

Download Dr.Web

Download by serial number

Download on App Store

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

Download Dr.Web

Download by serial number

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.
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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