How do I remove trojans

Avast Free Antivirus / Premium Security
1

I ran a different virus scan, it says I still have 5 trojans on my computer. How can I remove them?? When I run avast, it does not locate them???

2

Hi,

which scanner was this ? what were the exact trojan names and locations ?

what WIN do you have ? Are all ServicePacks and Windowsupdates applied ?

Where exactly was the infected File found (full path/folder/filename, e.g. c:\Windows\system32\virusfile.exe) ?

Sometimes it’s enough to

  • clear all TEMP-folders (via drive CleanUp AND best also manually)
  • empty Temp.Int.Files folder(s) (via IE->Extras-Internetoptions->Delete files, including OFFLINE files) and
  • empty java-Cache or
  • disable system restore on Win ME/XP INCLUDING a REBOOT!! ( http://vil.nai.com/vil/SystemHelpDocs/DisableSysRestore.htm )
    to get rid of it…

test the file with OnlineScanners e.g. from Trend, RAV & KAV (see below) to get a more specific name
(you need to temporarily pause AV-Resident Shield/Monitor/Guard to be able to scan the file online)

if avast doesn’t detect it, please send it in a password-protected zip-file to
virus (at) asw (dot) cz
Include the Zip-password and a link to this posting in the mailtext)

spybot, ad-aware and cwshredder might also help
see www.lurkhere.com ->nicefiles and www.lavasoft.de

-remove the Virus/Malware and it’s system modifications according to VirusInfos
from Avast, VGREP, TrendMicro, Kaspersky;
you might also try searching for the virus name or filename with google

general removal procedure:

  • disable system restore on Win ME/XP
  • kill respective Backdoor/Trojan process with task manager
  • search for the file/process names in the registry; remove the malware’s startup entries in the registry
  • disinfect or (if disinfection is not possible) delete the file; this may be possible only after a reboot

if you still can’t remove it, you could post a logfile of Hijackthis here:
http//hjt.klaffke.de/en
& read this first: http://www.spywareinfo.com/~merijn/htlogtutorial.html

-Secure your system:
change passwords, secure shares, install patches/updates for WIN&IE;
disable ActiveX and Scripting in IE except for know secure sites - and better use a secure browser like Opera or Mozilla

  • scan your whole system with updated avast and maybe a 2nd scanner ,e.g. TrendMicro/RAV to check whether your PC is clean :wink:
  • If needed, reenable system restore on Win ME/XP

Further Details and Links via the board search above

3

c:\WINDOWS\SYSTEM\zdpvygk.exe TrojanDownloader.Win32.Agent.ae

c:\WINDOWS\SYSTEM\zdpvygk.exe TrojanDownloader.Win32.Agent.ae

c:\WINDOWS\TEMP\iinstall.exe TrojanDownloader.Win32.IstBar.gen

c:\WINDOWS\TEMP\iinstall.exe TrojanDownloader.Win32.IstBar.gen

c:\WINDOWS\TEMP\istbar.dll TrojanDownloader.Win32.IstBar.dh

c:\WINDOWS\TEMP\istbar.dll TrojanDownloader.Win32.IstBar.dh

c:\WINDOWS\TEMP\THI6F36.TMP\polall1t.exe TrojanDownloader.Win32.Agent.ae

c:\WINDOWS\TEMP\THI6F36.TMP\polall1t.exe TrojanDownloader.Win32.Agent.ae

c:\WINDOWS\Downloaded Program Files\ISTactivex.dll TrojanDownloader.Win32.IstBar.en

c:\WINDOWS\Downloaded Program Files\ISTactivex.dll TrojanDownloader.Win32.IstBar.en

All found with F-secure

4

Sorry, forgot

Win Mellium

5

Hi,

please send them all to virus@avast.com if updated avast doesn’t find them…

then delete them, if necessary in SafeMode

and secure your Windows & IE better, please see board-search or google…

:wink: