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Antivirus scans not detecting trojans?


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#1 Archie_eihcrA

Archie_eihcrA

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Posted 24 August 2010 - 09:41 AM

Hello everyone,

I have a Windows 7/Windows XP Professional dual-boot. Every time I run Windows 7 (starting yesterday), several of the following happen:
  • BitDefender says it has blocked "Trojan.Generic.4478506" accessed by "explorer.exe", the location being "herzogdat.info/rp020832.exe"
  • BitDefender says it has blocked "Trojan.Generic.KD.28072" accessed by "explorer.exe", the location being "174.139.92.250/pr.exe"
  • BitDefender says it has blocked "Trojan.Generic.KD.26743" accessed by "explorer.exe", the location being "bedayton.com/loaderadv600.exe"
  • It says "BitDefender has blocked a potentially malicious or infected application.
    95445.exe
    Application:
    C:\Users\Ceru\AppData\Local\Temp\95445.exe" (the name of the file isn't always the same)
  • I get an error message titled "16 bit MS-DOS Subsystem" that says "C:\Users\Ceru\AppData\Local\Temp\7356.exe
    The NTVDM CPU has encountered an illegal instruction.
    CS:057d IP:fff9 OP:ff 7d 05 02 19 Choose 'Close' to terminate the application."
  • I get a dialog box, the Properties window of a file called "vsbntlo" (see below for screenshot):
  • Norton 360 (which I installed after these problems manifested, hoping it might help me solve them) says "AutoProtect blocked security risk Backdoor.Trojan"
  • Norton 360 says "AutoProtect blocked security risk Backdoor.Tidserv!gen5"
  • Norton 360 says "AutoProtect blocked security risk W32.Pilleuz"
  • Norton 360 says "SONAR has removed security risk ohydy.exe. Your computer is secure"
  • At some point the process ntvdm.exe starts taking up lots of CPU power, pumping CPU Usage to 100% (doesn't seem to happen anymore)
Posted Image

(The Norton 360 items also happen after some time has already passed since the OS started)

A BitDefender scan doesn't turn up anything, however. I also ran a Norton Antivirus scan from Windows XP; it detected one file (called "keytro.exe"), but after quarantine'ing it the problems still continue. Then I ran a Norton 360 scan from Windows 7 in Safe Mode, and I only found some tracking cookies whose removal did not help, as well as an additional "risk" which it promptly removed (apparently an W32.Pilleuz). After that the problems still continue, although there are fewer of them (I'm only still getting the "Norton 360 says "AutoProtect blocked security risk Backdoor.Tidserv!gen5"" one).

What do I do? Please help!

Edited by Archie_eihcrA, 24 August 2010 - 09:53 AM.


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