Trojan.Proscks.C

28 July 2008 Trojan 1 Comment

Trojan.Proscks.C is identified as proxy Trojans. Computer that is contaminated with a proxy Trojan may serve as bridge between the attacker and the Internet. Remote attackers may able to perform malicious actions globally and masquerades the assault using a proxy configuration established from victim’s computer.

Alias: TROJ_PROSCKS.AC, Trojan.Proscks!sd6, Generic.dx, Trojan.Win32.Agent.ynl, BackDoor-DPS, Mal/Generic-A, Troj/Agent-HLA, Trojan-Proxy.Win32.Small.uy

Damage Level: Medium

Systems Affected: Windows 9x, 2000, XP, Windows Vista

Characteristics
After execution of the Trojan, it will drop multiple files under Windows’ Temporary and System folders. Next, Trojan.Proscks.C injects own code on to legitimate system file so that it executes the dropped malicious file PHOST.DLL every time Windows starts.

This Trojan also downloads additional file from a remote hosts that when executed will again connect to a separate server to obtain a configuration file and update the Trojan by itself.

These infections may result to an excessive display of pop-up advertisements.

Distribution
Trojan.Proscks.C primarily spread through spam operation. It is sent-out in the form of email messages containing misleading messages that is sufficient to convince recipient to execute the attached file. Once executed, it utilizes the compromised system to send large amount of unsolicited email messages to spread a copy of the Trojan.

Associated Files and Folders:

%Temp%\RarSFX0\IPHOST.DLL
%Temp%\RarSFX0\iphy.dll
%Temp%\RarSFX0\xExe.dll
%Temp%\RarSFX0\loaderSvc.exe
%System%\IPHOST.DLL
%System%\_proxy.dll
%System%\iphy.dll
%System%\fhpatch.dll
%System%\fiplock.dll
%System%\IpSvchostF.dll
%System%\IPHACTION.dll

1. Temporarily Disable System Restore (Windows Me/XP). [how to]
2. To be able to identify even the most recent variant of Trojan.Proscks.C, open your antivirus application and update the virus definition file.

3. Start Windows in Safe Mode with Networking.
- From a power-off state, turn on the computer and press F8 on your keyboard repeatedly.
- Your computer will display Windows Advanced Boot Options menu. Please select Safe Mode with Networking.
- The system will now boot Windows and loads only necessary drivers and files.

4. Open your antivirus program and run a full system scan. After the scan, delete all infected items. If unable to delete, better place them in quarantine. Once the scan is complete, please proceed with the next step.

Scan with Norton Power Eraser:

Additional virus removal tool like Norton Power Eraser provides deep scanning technology to eliminate other threats not detected by a normal virus scan. Use this tool with extra caution.

5. Go to this link and download Norton Power Eraser.
6. Once the download completes, double click on the file NPE.exe to run the program.
7. It will prompt for End User License Agreement, click on Accept to continue.
8. On NPE main window, click on Scan. Then select Exclude Rootkit Scan. Click on Continue to proceed.
9. Virus scanning may take some time. After running the scan, NPE will display the scan result.

Important! If there are any detected threats under Suspicious, remove the check mark. Only threats in Detected category are necessary to remove at this point. Make sure that you mark the Create System Restore Point before proceeding with the fix.

10. Now click on Fix to start removing the threats including Trojan.Proscks.C remnants if there are any.
11. When done, Norton Power Eraser will restart the computer. Then after a reboot, it will initialize and display the eliminated threats.
12. You may now close Norton Power Eraser.