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MR.6
注册日期: Oct 2002
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http://securityresponse.symantec.co.../w32.pinfi.html
W32.Pinfi
Discovered on: October 11, 2001
Last Updated on: January 17, 2003 11:03:23 PM
W32.Pinfi is a memory-resident polymorphic virus that will infect the .EXE and .SCR files.
Type: Zoo Virus
Infection Length: ~177,917 bytes
Systems Affected: Windows 95, Windows 98, Windows NT, Windows 2000, Windows XP, Windows Me
Systems Not Affected: Macintosh, OS/2, UNIX, Linux
Virus Definitions (Intelligent Updater) *
October 12, 2001
Virus Definitions (LiveUpdate™ **
October 17, 2001
*
Intelligent Updater virus definitions are released daily, but require manual download and installation.
Click here to download manually.
**
LiveUpdate virus definitions are usually released every Wednesday.
Click here for instructions on using LiveUpdate.
Upon executing a file infected with W32.Pinfi, the virus will perform the following:
1. Adds the registry value:
PINF
to the registry key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
2. Appends itself to Explorer.exe to remain memory-resident.
3. Appends itself to all the .EXE and .SCR files that it finds on all the local and mapped drives. The virus contains an algorithm to slow the infection, so the virus will only infect a few files at a time.
The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
1. Update the virus definitions.
2. Run a full system scan and repair all the files detected as W32.Pinfi.
3. Reverse the value that the virus added to the registry.
For specific details on each of these procedures, read the following instructions.
1. Updating the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
Running LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate), in the "Protection" section, at the top of this writeup.
Downloading the definitions using the Intelligent Updater. The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater), in the "Protection" section, at the top of this writeup.
The Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.
2. Scanning for and repairing the infected files
a. Start your Symantec antivirus software and make sure that it is configured to scan all the files.
For Norton AntiVirus consumer products: Read the document, "How to configure Norton AntiVirus to scan all files."
For Symantec AntiVirus Enterprise products: Read the document, "How to verify that a Symantec corporate antivirus product is set to scan All Files."
b. Run a full system scan.
c. If any files are detected as infected with W32.Pinfi, click Repair.
3. Reversing the value from the registry
CAUTION: Symantec strongly recommends that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry," for instructions.
a. Click Start, and then click Run. (The Run dialog box appears.)
b. Type regedit, and then click OK. (The Registry Editor opens.)
c. Navigate to the key:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
d. In the right pane, delete the value: PINF
e. Exit the Registry Editor.
Write-up by: Douglas Knowles
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