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Previous "Backdoor.agent"


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#1 Kanko

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Posted 19 January 2011 - 08:30 PM

Hello, i'm running a Windows XP SP3 computer and I quickly realized in an updated full scan today with Malwarebytes I had a series of "Backdoor.Agents", upon discovery I quickly quarantined and deleted the files and performed a computer restart. However upon restarting I received a message where "Windows could not find C:\Documents" I have performed a second full scan after this observation but did not find anything the second time around. I am unsure if I am still infected and unsure if I may have a rootkit or not. I have the malwarebytes logs if they are necessary and am currently running a gmer scan. The thing that worries me is the startup message I keep receiving even in Windows Safe Mode as "Windows could not find C:\Documents".

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#2 boopme

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Posted 19 January 2011 - 11:43 PM

Hello Kanko,
A backdoor Trojan can allow an attacker to
gain control of the system, log keystrokes, steal passwords, access personal
data, send malevolent outgoing traffic, and close the security warning
messages displayed by some anti-virus and security programs.

You must change any passwords or security information held
on the infected computer. In particular, check whatever relates to online
banking financial transactions, shopping, credit cards, or sensitive
personal information. It is also wise to contact your financial institutions
to apprise them of your situation.


"Windows could not find"
You will need to remove the last entry in the C:\Documents...message. An example is c:\windows\system32\nefavega.dll <<-- this being the item to remove

Its not unusual to receive such an error after using specialized fix tools.

A "Cannot find...", "Could not run...", "Error loading... or "specific module could not be found" message is usually related to malware that was set to run at startup but has been deleted. Windows is trying to load this file but cannot locate it since the file was mostly likely removed during an anti-virus or anti-malware scan. However, an associated orphaned registry entry remains and is telling Windows to load the file when you boot up. Since the file no longer exists, Windows will display an error message. You need to remove this registry entry so Windows stops searching for the file when it loads.

To resolve this, download Autoruns, search for the related entry and then delete it.

Create a new folder on your hard drive called AutoRuns (C:\AutoRuns) and extract (unzip) the file there. (click here if you're not sure how to do this.)
Open the folder and double-click on autoruns.exe to launch it.
Please be patient as it scans and populates the entries.
When done scanning, it will say Ready at the bottom.
Scroll through the list and look for a startup entry related to the file(s) in the error message.
Right-click on the entry and choose delete.
Reboot your computer and see if the startup error returns.
Credit to quietman7


Please post the MBAM log. The log is automatically saved and can be viewed by clicking the Logs tab in MBAM.
Copy and paste the contents of that report in your next reply. Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.


Next run ATF and SAS: If you cannot access Safe Mode,run in normal ,but let me know.

Note: On Vista, "Windows Temp" is disabled. To empty "Windows Temp" ATF-Cleaner must be "Run as an Administrator".

From your regular user account..
Download Attribune's ATF Cleaner and then SUPERAntiSpyware , Free Home Version. Save both to desktop ..
Close all open browsers before using, especially FireFox. <-Important!!!
DO NOT run yet.
Open SUPER from icon and install and Update it
Under Scanner Options make sure the following are checked (leave all others unchecked):
Close browsers before scanning.
Scan for tracking cookies.
Terminate memory threats before quarantining
.
Click the "Close" button to leave the control center screen and exit the program. DO NOT run yet.

Now reboot into Safe Mode: How to enter safe mode(XP)
Using the F8 Method
Restart your computer.
When the machine first starts again it will generally list some equipment that is installed in your machine, amount of memory, hard drives installed etc. At this point you should gently tap the F8 key repeatedly until you are presented with a Windows XP Advanced Options menu.
Select the option for Safe Mode using the arrow keys.
Then press enter on your keyboard to boot into Safe Mode
.

Double-click ATF-Cleaner.exe to run the program.
Under Main "Select Files to Delete" choose: Select All.
Click the Empty Selected button.

If you use Firefox or Opera browser click that browser at the top and choose: Select All
Click the Empty Selected button.
If you would like to keep your saved passwords, please click No at the prompt.
Click Exit on the Main menu to close the program
.

NOW Scan with SUPER
Open from the desktop icon or the program Files list
On the left, make sure you check C:\Fixed Drive.
Perform a Complete scan. After scan,Verify they are all checked.
Click OK on the summary screen to quarantine all found items.
If asked if you want to reboot, click "Yes" and reboot normally.

To retrieve the removal information after reboot, launch SUPERAntispyware again.
Click Preferences, then click the Statistics/Logs tab.
Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
If there are several logs, click the current dated log and press View log.
A text file will open in your default text editor.
Please copy and paste the Scan Log results in your next reply.
Click Close to exit the program.


Please ask any needed questions,post logs and Let us know how the PC is running now.

Edited by boopme, 19 January 2011 - 11:46 PM.

How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#3 Kanko

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Posted 20 January 2011 - 04:39 PM

Hi, and thank you for the response. I had tried the autoruns program to remove the startup message yesterday but after deleting the entries the message still continued;however I managed to get rid of it by entering my registry and editing a registry called "shell" under "winlogon" and changed "Explorer.exe C:\Documents" to "Explorer.exe" which removed the startup message.
I have just completed the SUPER scan and have quarantined the items that appeared also, this is my log although I have omitted the cookie detections due to length. I feel I am quite aware of 3/4ths of the detections from SUPER besides the autodrag detection.
From Super:
SUPERAntiSpyware Scan Log
http://www.superantispyware.com

Generated 01/20/2011 at 04:17 PM

Application Version : 4.48.1000

Core Rules Database Version : 6243
Trace Rules Database Version: 4055

Scan type : Complete Scan
Total Scan Time : 01:15:52

Memory items scanned : 237
Memory threats detected : 0
Registry items scanned : 7884
Registry threats detected : 0
File items scanned : 126225
File threats detected : 484

Trojan.Agent/Gen-ReLoader
C:\AUTODRAG.EXE



Trojan.Agent/Gen-Frauder[Startup]
C:\DOCUMENTS AND SETTINGS\HP_ADMINISTRATOR\DESKTOP\V10.2\FOSSIL RESTORATION\FOSSIL RESTORATION 10.1.EXE

Trojan.Agent/Gen-Goo
C:\DOCUMENTS AND SETTINGS\HP_ADMINISTRATOR\DESKTOP\V10.2\FOSSIL RESTORATION\FOSSIL_RESTORATION_10.2.EXE
C:\DOCUMENTS AND SETTINGS\HP_ADMINISTRATOR\DESKTOP\V10.2\UPDATE FOSSIL RESTORATION.EXE

the following are my MBAM logs before and after removal respectively from yesterday.
Before:
Malwarebytes' Anti-Malware 1.50.1.1100
www.malwarebytes.org

Database version: 5556

Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702

1/19/2011 5:11:46 PM
mbam-log-2011-01-19 (17-11-46).txt

Scan type: Full scan (C:\|)
Objects scanned: 295326
Time elapsed: 1 hour(s), 10 minute(s), 31 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 1
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 3

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Update (Backdoor.Agent) -> Value: Update -> Quarantined and deleted successfully.

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
c:\documents and settings\hp_administrator\application data\microsoft\windows update.exe (Backdoor.Agent) -> Quarantined and deleted successfully.
c:\documents and settings\hp_administrator\local settings\Temp\Rar$EX04.562\tiaramodg13.exe (Backdoor.Agent) -> Quarantined and deleted successfully.
c:\program files\foobar2000\components\amip_uninstall.exe (Trojan.Clicker) -> Quarantined and deleted successfully.

After:
Malwarebytes' Anti-Malware 1.50.1.1100
www.malwarebytes.org

Database version: 5556

Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702

1/19/2011 6:44:30 PM
mbam-log-2011-01-19 (18-44-30).txt

Scan type: Full scan (C:\|)
Objects scanned: 282904
Time elapsed: 1 hour(s), 8 minute(s), 33 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

And as I am running my computer right now, I do not feel anything strange occurring and my computer appears to be running more smoothly than yesterday. Thank you for the help.

#4 boopme

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Posted 20 January 2011 - 04:48 PM

Ok, this is good and since you know those that's good. Remember to change the passwords.

You are most welcome!!

If there are no more problems or signs of infection, you should Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back" to a clean working state.

The easiest and safest way to do this is:
  • Go to Start > Programs > Accessories > System Tools and click "System Restore".
  • Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
  • Then use Disk Cleanup to remove all but the most recently created Restore Point.
  • Go to Start > Run and type: Cleanmgr
  • Click "Ok". Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" tab, then click the "Clean up" button under System Restore.
  • Click Ok. You will be prompted with "Are you sure you want to delete all but the most recent restore point?"
  • Click Yes, then click Ok.
  • Click Yes again when prompted with "Are you sure you want to perform these actions?"
  • Disk Cleanup will remove the files and close automatically.
Vista Users can refer to these links: Create a New Restore Point and Disk Cleanup.

Tips to protect yourself against malware and reduce the potential for re-infection:Avoid gaming sites, pirated software, cracking tools, keygens, and peer-to-peer (P2P) file sharing programs. They are a security risk which can make your computer susceptible to a smörgåsbord of malware infections, remote attacks, exposure of personal information, and identity theft. Many malicious worms and Trojans spread across P2P file sharing networks, gaming and underground sites. Users visiting such pages may see innocuous-looking banner ads containing code which can trigger pop-up ads and malicious Flash ads that install viruses, Trojans and spyware. Ads are a target for hackers because they offer a stealthy way to distribute malware to a wide range of Internet users. The best way to reduce the risk of infection is to avoid these types of web sites and not use any P2P applications. Read P2P Software User Advisories and Risks of File-Sharing Technology.

Keeping Autorun enabled on USB and other removable drives has become a significant security risk due to the increasing number of malware variants that can infect them and transfer the infection to your computer. To learn more about this risk, please read:
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#5 Kanko

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Posted 20 January 2011 - 05:18 PM

I have taken the precautions necessary with sensitive material as you have suggested. Thank you again for the help.

#6 boopme

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Posted 20 January 2011 - 09:02 PM

:thumbup2: Our Pleasure
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook




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