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Trojan:Win32/Varpes.J!plock


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#1 jheinrichs

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Posted 24 February 2016 - 10:38 AM

I am running Windows Defender and it found "Trojan:Win32/Varpes.J!plock" inside Combofix that downloaded directly from bleepingcomputer.

 

Should I be worried about this?

 

 

 



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#2 quietman7

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Posted 24 February 2016 - 10:49 AM

No. This is a false positive by the anti-virus. Bleeping Computer's hosted programs for download are trustworthy, safe and malware-free.

Certain embedded files that are part of legitimate programs or specialized fix tools such as Combofix may at times be detected by some anti-virus and anti-malware scanners as suspicious, a Risk Tool, Hacking Tool, Potentially Unwanted Program, a possible threat or even Malware (virus/trojan) when that is not the case. This occurs for a variety of reasons to include the tool's compiler, the files it uses, whether files are compressed or packed, what behavior (routines, scripts, etc) it performs, any registry strings it may contain and the type of security engine that was used during the scan. Other legitimate files which may be obfuscated, encrypted or password protected in order to conceal itself so they do not allow access for scanning but often trigger alerts by anti-virus software.

When flagged by an anti-virus or security scanner, it's because the program includes features, behavior or files that appear suspicious or which can potentially be used for malicious purposes. Compressed and packed files in particular are often flagged as suspicious by security software because they have difficulty reading what is inside them. These detections do not necessarily mean the file is malicious or a bad program. It means it has the potential for being misused by others or that it was simply detected as suspicious or a threat due to the security program's heuristic analysis engine which provides the ability to detect possible new variants of malware. Anti-virus scanners cannot distinguish between "good" and "malicious" use of such programs, therefore they may alert you or even automatically remove them. In these cases the detection is a "false positive" and can be ignored. Either have your anti-virus ignore the detection or temporarily disable it until you download and run the tool.

Most of the well known specialized tools we use against malware are written by experts/Security Colleagues at various security forums like Bleeping Computer, TechSupport, GeeksToGo, Emsisoft and other similar sites so they can be trusted...this includes any program hosted by BC for download. Unfortunately, many of these tools are falsely detected by various anti-virus programs from time to time for the reasons noted above. This in turn sometimes results in an inaccurate site rating/warning of potentially dangerous software when that is not the case.

The problem is really with the anti-virus vendors who keep targeting these embedded files and NOT with ComboFix. We can inform the developer but he has encountered this issue many times before and in most cases there isn't much he can do about it. Once the detection is reported to the anti-virus vendor, they are usually quick to fix it by releasing an updated definition database.
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#3 jheinrichs

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Posted 24 February 2016 - 10:51 AM

I assumed this to be the case but I just wanted to make sure that this was to be expected.

Thanks for your time! I really appreciate it!



#4 quietman7

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Posted 24 February 2016 - 11:25 AM

You're welcome.
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