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ComboFix problems


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#1 tommy2k8

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Posted 07 October 2010 - 05:05 AM

I don't know if this is the right section, but here goes:

I have a client who had a malware infection (Trojan Fake.Alert, multiple Rogue.Security incarnations) and I managed to get rid of it using SuperAntiSpyware, MalwareBytes and MGTools (Majorgeeks.com). I normally use ComboFix as well.

However, when I tried to run ComboFix, AVG 2011 (even with Resident Shield disabled) flagged it as containing malware.gam (or gem).

My client has Windows Vista Home Premium 32-bit. (When I ran it on another Vista client computer with AVG 9.0 (again, disabled) it was OK).

Why is this?

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#2 quietman7

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Posted 07 October 2010 - 07:00 AM

Please note the message text in blue at the top of this forum.

No one should be using ComboFix unless specifically instructed to do so by a Malware Removal Expert who can interpret the logs. It is a powerful tool intended by its creator to be "used under the guidance and supervision of an expert. Using this tool incorrectly could lead to disastrous problems with your operating system such as preventing it from ever starting again. Please read the pinned topic ComboFix usage, Questions, Help? - Look here.

With that said, 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 a "Risk Tool", "Hacking Tool", "Potentially Unwanted Program", 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, registry fixes, malware strings it contains and the type of security engine that was used during the scan.

Such programs have legitimate uses in contexts where a Malware Removal Expert asked you to use the tool or when an authorized user/administrator has knowingly installed it. 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. These detections do not necessarily mean the file is malware 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". In the scenario you describe, AVG 2011 was falsely detecting it while AVG 9 did not.
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