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product checksums / dig sig ?


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#1 tt1

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Posted 01 August 2014 - 10:21 AM

I tried installing ComboFix, various file analysis sites would say it is infected with viruses

eg https://www.virustotal.com/en/file/7f465a5fe869500842acb60386b914bac94977edae3acafb5f3c03b1b9ff0f66/analysis/

even if it is not, even if those are false positives because it contains strings some some viruses contain, how can I know it has not been infected since Bleeping Computer LLC published it on their website.....

authenticode  certificate (Unknown Publisher http://www.bleepstatic.com/combofix/en/open-file-warning.jpg) would cost some money,

 

 

but there are also no pgp signatures or at least official md5/sha* checksums ?

 



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#2 quietman7

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Posted 01 August 2014 - 11:59 AM

Yes this is a false positive by the anti-virus.

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.

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.

The official site for downloading ComboFix is provided in the authorized Guide and tutorial on using ComboFix hosted by BleepingComputer. All of our hosted downloads are malware free.

Once you double-click on the icon, you may see a screen similar to the one below.

open-file-warning.jpg

Windows is issuing this prompt because ComboFix does not have a digital signature. This is perfectly normal and safe and you can click on the Run button to continue...

A guide and tutorial on using ComboFix

ComboFix.org and ComboFixdownload.com offer unauthorized versions of Combofix and the download links are seldom current. Neither of these sites are affiliated with ComboFix by sUBs.
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