high
Summary
Summary
Action- More Information
| How it spreads |
|
|---|---|
| Affected operating systems | Windows |
| Characteristics |
|
| Protection available since | 23 May 2005 21:43:56 (GMT) |
| Detected by | All Sophos products |
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Action
- Summary
- Action
- More Information
Please follow the instructions for removing worms.
Windows NT/2000/XP/2003
In Windows NT/2000/XP/2003 you will also need to edit the following registry entry. The removal of this entry is optional in Windows 95/98/Me. Please read the warning about editing the registry.
At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.
Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.
Locate the HKEY_LOCAL_MACHINE entry:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
MsConfigs
"<Program files folder>\MsConfigs\MsConfigs.exe"
and delete it if it exists.
Close the registry editor.
More Information
W32/Alcra-A is a worm for the Windows platform.
W32/Alcra-A drops the files temp.zip, p2pnetwork.exe and bszip.dll to the Windows system folder. The temp.zip file is a zipped copy of the worm. Bszip.dll is a clean file compression utility. Sophos's anti-virus products detect p2pnetwork.exe as W32/Rbot-ACZ.
The worm copies itself into shared folders used by common Peer to Peer (P2P) filesharing applications. W32/Alcra-A is a worm for the Windows platform.
When run, W32/Alcra-A copies itself to the following locations:
<Program files folder>/MsConfigs/MsConfigs.exe
/z.tmp
The worm then sets the following registry entry in order to run each time a user logs on:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
MsConfigs
"<Program files folder>\MsConfigs\MsConfigs.exe"
W32/Alcra-A drops the files temp.zip, p2pnetwork.exe and bszip.dll to the Windows system folder. The temp.zip file is a zipped copy of the worm. Bszip.dll is a clean file compression utility. Sophos's anti-virus products detect p2pnetwork.exe as W32/Rbot-ACZ.
W32/Alcra-A replaces the following system utilities with corrupt files:
cmd.com
netstat.com
ping.com
regedit.com
taskkill.com
tasklist.com
taskmgr.exe
tracert.com
The worm copies itself into shared folders used by common Peer to Peer (P2P) filesharing applications where the path to the folder contains any of the following:
Ares\My Shared Folder
Bearshare\Shared
Edonkey2000\Incoming
eMule\Incoming
gnucleus\downloads
grokster\my grokster
Kazaa\My Shared Folder
Limewire\Shared
morpheus\My Shared Folder
My Shared Folder
rapigator\share
shareaza\downloads
shared
W32/Alcra-A may also modify documents containing hyperlinks by changing the hyperlink destination to point to a predefined URL.
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