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7 / 48 AV detects ComboFix. False positive?

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#1 Wileyed


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Posted 03 January 2014 - 07:19 AM

It seems to be a new file based on first submission date and 0 comments or votes for such a popular program.  Has this been infected again or is it a false positive.


Report: https://www.virustotal.com/en/file/9b2d5b4d7307f44fd4b3ffcf84fadebbdf3de068e33cc6adba61ce29e8c60d1d/analysis/1388750468/

Downloaded from: http://www.bleepingcomputer.com/download/combofix/



Jiangmin Trojan/JmGenGeneric.boe 20140103

Kingsoft Win32.HeurC.KVM003.a.(kcloud) 20130829
McAfee Artemis!A085D5874473 20140103
McAfee-GW-Edition Artemis!A085D5874473 20140103
Rising PE:Malware.XPACK/RDM!5.1 20140103
Sophos NirCmd 20140103
TrendMicro-HouseCall TROJ_GEN.F47V0101 20140103


First submission 2014-01-01 18:59:38 UTC ( 1 day, 17 hours ago )

Last submission 2014-01-03 12:01:08 UTC ( 4 minutes ago )

Edited by Wileyed, 03 January 2014 - 07:20 AM.

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#2 quietman7


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Posted 03 January 2014 - 11:38 AM

This is a false positive by the anti-virus. Combofix is not malware. However, 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. For example, Catchme is a rootkit scanner that detects userland rootkits and is incorporated with some specialized fix tools like Combofix and GMER.

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.

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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