Questions

Anti-Virus will not install!

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Anti-Virus will not install!

RazorEdge
My customer's computer was recently infected (and cleaned afterwards) by something. Running in safe mode, two programs spotted trojans & "removed" them. Now the scans are showing clean, but every time I attempt to install or update an "anti" program, it's setup fails.

Had problems with Microsoft's Security Essentials, too. It installed ok, but only fires-up every other boot!! When it's down, it says it can't find the net, but I am able to surf the net just fine.
++++++UPDATE++++++++++++++++++++++++

Here is more information; I am a computer tech and experienced in de-bugging infected machines. With this customer's rig, initially, I followed standard procedures in un-installing & re-installing av programs.
This machine errored-out with every attempt to up-date the particular AV program attempted (AVG, Security Essentials, Malware Byes, spybot). Got to the point where last night I re-installed the whole OS.

The newly-installed XP was not a re-format, just a write-over. It has been fully re-installed now in ALL respects, and is otherwise working just fine. BUT ... it STILL is FAILING to allow ANY AV program to be up-dated! The programs install ok; they just will not update. Depending on the program used, there is just a numerical error code without meaning that is referenced.

I know that my last, best shot is to back-up
all his stuff (taking hours) & totally wipe the drive, then re-install all over again. But what I want to know is, what is causing this? Is there anything else I can try, safe-mode or otherwise, before starting all over again?
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pirho

Try loading a different product Like avast.

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otaku_lord

It sounds like you may still have something infecting your machine.

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OldER Mycroft

"NOw the scans are showing clean, but every time I attempt to install AVG, the setup fails."

If "the scans are showing clean" you must ALREADY have an anti-virus program installed. Why therefore are you attempting to install AVG ??

Most likely, whatever is already installed, is preventing AVG from installing.

99.9% of the time you cannot run TWO anti-virus programs simultaneously because they'll both compete for control.

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SystemCheck

when you say avg wont install is it giving you an error message like say perhaps cannot write to registry access denied?

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RazorEdge

I have tried installing Ad-Aware, AVG, and Microofts Security essentials; each returned an error msg. with coded numbers for reference. No specific references, though.

The broadband modem also had to b replaced, as I got limited connectivity. This allowed me to re-access the net ok.

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otaku_lord

two AV progs installed before. It was an issue that we had with our users when I was in Iraq. We used TrendMicro for Enterprise. Since it wasn't well known by our South African, Ugandan, and Filipino users they installed AVG, AVAST, or NOD32 on their own. We actually had to take the dept managers aside and give them a class on it!! My point being that they still run but will usually bog the system down because they require an immense amount of resources to run... especially on laptops...

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OldER Mycroft

I said you couldn't RUN them simultaneously - and you can't.

What most users do is have #1 anti-virus actively scanning the system and the online activity, while #2 is NOT active. By disabling the active scanning of #1, a scan can then be carried out by #2, and so on.

However, if a user attempts to make both #1 and #2 active at the same time, each anti-virus program will identify the other as a virus.

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Jacky Howe

Follow the steps below with the System started and restarted in Safe Mode with Networking. Running in Safe Mode loads a minimal set of drivers for the Operating System. You can use these options to start Windows so that you can modify the registry or load or remove drivers. If you can access the Internet use it to download and install the files.

If you can't access the internet to update MBAM try the instructions below to clear a path to the internet to be able to run MBAM. You can also download the updates for MBAM and run them from the USB.

From another System download and install Spybot, update it and copy the the installed folders to a USB Stick. Copy MBAM and the Update as well.

With the new strains of Virus that have been created you may find it necessary to rename the executable files so that they will work. Rename mbam-setup.exe and then navigate to the install folder and rename mbam.exe. Do not change the files extension from .exe. Do the same with Spybot.

Removing malware from System Restore points:

When your infected with any trojans, spyware, malware, they could have been saved in System Restore and can re-infect you. It's best to remove them.

XP
Press the WinKey + r type sysdm.cpl and press Enter.
Select the System Restore tab and check "Turn off System Restore".


Vista
Press the WinKey + r type sysdm.cpl and press Enter
Select the System Protection tab. Untick the box next to Local Disk C: and any other drives and click on Turn System Restore off.


After scanning the system and removing the offending malware, re-enable System Restore by repeating the steps, this time removing the check from "Turn off System Restore".
When all is clear you may need to tidy up the Registry. Link is at the bottom.


Once you have restarted the Infected System in Safe Mode, navigate to the USB stick and run Spybot.

Download Spybot - Search & Destroy and install it. Update it. http://www.safer-networking.org/en/download/index.html

When you first start Spybot, click on the Mode menu and select Advanced mode. Under the Tools options (bottom left) select View Report. On the screen in the right hand pane, select View report to create a new report. Save the report as it may come in handy later. Spybot will also keep log files in this location in Vista:

C:\ProgramData\Spybot - Search & Destroy\Logs

Spybot will also keep saved log files in this location in XP:

C:\Documents and Settings\All Users\Application Data\Spybot - Search & Destroy\Logs


Download Malwarebytes Anti-Malware, install it and update it.

<a href="http://download.bleepingcomputer.com/malwarebytes/mbam-setup.exe" target="_blank"><u>Malwarebytes</u></a>

* Double-click mbam-setup.exe and follow the prompts to install the program.
* At the end, be sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
* If an update is found, it will download and install the latest version.
* Once the program has loaded, select Perform Quick Scan, then click Scan.
* When the scan is complete, click OK, then Show Results to view the results.
* Be sure that everything is checked, and click Remove Selected.

If you encounter any problems while downloading the updates, manually download them from here and just double-click on mbam-rules.exe to install.
<a href="http://malwarebytes.gt500.org/" target="_blank"><u>mbam-rules</u></a>

I would keep scanning with it until it is clean by closing out and rebooting and running it again.

Run this Rootkit Revealer GMer
<a href="http://www.gmer.net/index.php" target="_blank"><u>Gmer</u></a>

FAQ
<a href="http://www.gmer.net/faq.php" target="_blank"><u>FAQ</u></a>


Those applications should be able to get you up and running. Here are some extra tasks if it is not working for you.

Tip! If you want to write protect the USB drive/stick while you are working on an infected System.
In the recent release of Windows XP Service Pack 2 (SP2), a new feature was added by Microsoft to allow the write protection of USB block storage devices. This entails a simple Registry modification that requires no hardware devices to write protect thumb drives.

If the USB drive has no small switch for write protection you can turn it on through the Registry via Command Line.

REG ADD HKLM\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies /v WriteProtect /t REG_DWORD /d 1 /f

and one to turn it off but a System restart is required. Place a Batch file on the USB to turn it off.

reg delete HKLM\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies /f


If TaskManager has been disabled this will enable TaskManager to allow access to the Registry.

Command line removal or create Batch files.

Click Start Run and type cmd and then press Enter.

Execute the following commands in the command line in order to activate the registry editor and Task Manager:

reg delete HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /f

reg delete HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /f

You could also check these registry entries and change the values from 1 to 0 if they are disabled.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center "FirewallOverride" = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center "AntiVirusOverride" = "1"


If you are still having problems try this.

Download Combofix and rename the executable Combofix.exe to cfix.exe before running it.

http://www.combofix.org/

http://www.combofix.org/download.php


By now you should know what the name if the infection is, if you think that it may have infected the MBR try this.

Fixmbr - Repair Master Boot Record and remove Viral activity: XP Win2003

Site
http://www.ambience.sk/fdisk-master-boot-record-windows-linux-lilo-fixmbr.php

Download
http://www.ambience.sk/experiments/MbrFix.exe


Download MbrFix to c:\

Press Winkey + r and type in cmd and press Enter.

now type cd\ and press Enter.

now type MbrFix /drive 0 savembr Backup_MBR_0.bin and press Enter.


now type MbrFix /drive 0 fixmbr /yes and press Enter.

now type exit and press Enter.

Restart the System for it to take effect.


Registry Cleanup:

Download and install CCleaner to tidy up your Registry. Backup the Registry as you go along, rescan again and again saving as you go until there are no errors left.

Cleaner: Windows

When you first open Ccleaner you will have an option to Analyze or Run Cleaner, after checking the left Pane and making your choices. Delete all Temp Files. If you scroll down you will see a greyed out box that has Advanced next to it. Left click on it and keep pressing OK to all of the responses. I normally Untick Windows Log Files and Memory Dumps as they may come in handy.

You don't have to install all of the add ons or shortcuts just the one to the Desktop.

http://www.ccleaner.com/download


Or if you want to wipe the Hard drive and start fresh try this. This is a sure way to remove any infections.

DBAN will overwrite the hard drive filling it with 0's and 1's completly wiping the drive of information. You then create new Partitions, Format and install the OS without having to worry about a reinfection. Any traces of the Viral infection should be annihilated.

Darik's Boot and Nuke.

http://dban.sourceforge.net/

Autonuke should do it by running it at least 3 times.


Removal Tools

http://www.symantec.com/business/security_response/removaltools.jsp