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eset nod not finishing on demand scan


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#1 markmurfie

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Posted 07 February 2011 - 09:14 PM

I noticed after scanning an infected computer with combo fix( I don't care if it breaks the computers I work on) that the permissions to c:\windows\temp are changed. I noticed this after running eset nod32 AV on a few computers and having the scan stop on rt.jar never to finish. I'm sorry if this was already a known issue I do not browse the forums regularly or if I'm posting this in the wrong place.

Edited by boopme, 07 February 2011 - 09:17 PM.
Moved to appropriate forum


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#2 quietman7

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Posted 08 February 2011 - 08:44 AM

The speed and ability to complete an anti-virus or anti-malware scan depends on a variety of factors.
  • The program itself and how its scanning engine is designed to scan: using a signature database vs heuristic scanning or a combination of both.
  • Options to scan for spyware, adware, riskware and potentially unwanted programs (PUPS).
  • Options to scan memory, boot sectors, registry and alternate data streams (ADS).
  • Type of scan performed: Deep, Quick or Custom scanning.
  • What action has to be performed when malware is detected.
  • A computer's hard drive size.
  • Disk used capacity (number of files to include temporary files) that have to be scanned.
  • Types of files (.exe, .dll, .sys, .cab, archived, compressed, packed, email, etc) that are scanned.
  • Whether external drives are included in the scan.
  • Competition for and utilization of system resources by the scanner.
  • Other running processes and programs in the background.
  • Interference from malware.
  • Interference from the user.
-- Using two security scanning engines at the same time can cause each to interfere with the other, cause systems hangs, false detections, unreliable results and other unpredictable behavior. Some online scanners will detect existing anti-virus software and refuse to cooperate so may have to disable the real-time protection components of your existing anti-virus and try running the scan again.

It is not unusual for an anti-virus or anti-malware scanner to be suspicious of some compressed, archived, .cab .jar and packed files because they have difficulty reading what is inside them. These kind of files often trigger alerts by security software using heuristic detection because they are resistant to scanning (difficult to read). This resistance may also result in some scanners to stall (hang) on these particular types of files or just ignore (skip) them.

...JAR file is a file format based on the popular ZIP file format and is used for aggregating many files into one. A JAR file is essentially a zip file...

JAR File Specification
The Java Archive (JAR) File Format

If the hang always seems to be on a specific file, submit it to the anti-virus vendor for further analysis by their lab.
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