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Yahlover

Posted: November 11, 2008

Yahlover is an Internet worm that spreads by the use of Yahoo messenger. Yahlover worm is also known as W32/YahLover.worm.a and W32/YahLover.worm.gen. Yahlover may also be spread by Autorun.ini files so that it may be automatically executed on systems where Autorun is enabled.

Yahlover will circulate download links to all members in your Yahoo buddy list. Yahlover worm will block your registry and reboot your computer whenever you attempt to go to the command prompt. Yahlover worm may also change the configuration of your Yahoo Messenger. Yahlover is a pestering malevolent virus and needs to be deleted right away. If you get infected remove the Yahlover worm with a reliable anti-virus, anti-spyware software.

File System Modifications

  • The following files were created in the system:
    # File Name
    1 21srg698.au3.tb
    2 csrcs.exe

Registry Modifications

  • The following newly produced Registry Values are:
    HKEY..\..\..\..{Subkeys}HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Hidden = dword:00000002HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = dword:00000000HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\SuperHidden = dword:00000000HKLM\SOFTWARE\ESET\Nod\CurrentVersion\Modules\AMON\Settings\Config000\Settings\exc = HKLM\SOFTWARE\ESET\Nod\CurrentVersion\Modules\AMON\Settings\Config000\Settings\exc_num = dword:0000000cHKLM\SOFTWARE\ESET\Nod\CurrentVersion\Modules\AMON\Settings\Config000\Settings\media_network = dword:00000000HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe csrcs.exe"HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL\CheckedValue = dword:00000001HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run\csrcs = "%System%\csrcs.exe"

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