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fatemp-icon.exe (Trojan.Dropper) possible false positive?


Soul34t3r
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Hi, I've got a weird possible false positive. It's a zero size file in my temp directory and it looks like the file has been there for a long while, along with other similarly named files like fatemp-icon.css. I don't know where those files came from, but I don't see any other signs of malicious activity, so I guess they could be harmless temp files of some kind? Here's the requested logs etc.

Malwarebytes' Anti-Malware 1.50.1.1100

www.malwarebytes.org

Database version: 5428

Windows 5.1.2600 Service Pack 3

Internet Explorer 7.0.5730.11

31.12.2010 18:40:01

mbam-log-2010-12-31 (18-40-01).txt

Scan type: Quick scan

Objects scanned: 141521

Time elapsed: 47 second(s)

Memory Processes Infected: 0

Memory Modules Infected: 0

Registry Keys Infected: 0

Registry Values Infected: 0

Registry Data Items Infected: 0

Folders Infected: 0

Files Infected: 1

Memory Processes Infected:

(No malicious items detected)

Memory Modules Infected:

(No malicious items detected)

Registry Keys Infected:

(No malicious items detected)

Registry Values Infected:

(No malicious items detected)

Registry Data Items Infected:

(No malicious items detected)

Folders Infected:

(No malicious items detected)

Files Infected:

c:\documents and settings\Aeon\local settings\Temp\fatemp-icon.exe (Trojan.Dropper) -> Not selected for removal. [d36136df06fab34d16e3610dfd0639c7]

Thanks for your great software! :)

fatemp_icon.zip

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  • 3 weeks later...

Sorry about the bump, but no news about this? I'm still getting this possible false positive with 15 January 2011 MBAM defs. The detection is also very vague. "Trojan.Dropper"? It doesn't tell much, like which trojan etc. I've tried to google for more information, but I can't find anything very helpful. All I find is this thread and a thread from this summer at Avast forums where someone also had fatemp-icon.exe detected by MBAM in addition to other stuff.

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Thanks for your help, guys :huh:

Upload it to VirusTotal and see what comes back..

I tried that, but VT just says it can't upload a zero size file and does nothing, because the file really seems to be zero size.

This is ok to delete. Its a 0 byte file. It may have been malware but whatever tried to download it to your computer the website it downloads may be offline. Thus is creates it with 0 bytes.

Let me know after you delete it if it comes back.

Thanks. I figured it's ok to delete, but I was wondering what makes MBAM detect it. Is it a file name based detection, like some trojan using that name? Maybe it would help that there are other "fatemp-icon" files in my Temp folder in addition to that .exe, such as fatemp-icon.html and fatemp-icon.txt, and all are zero size. Maybe it was a malware that tried to download but failed like you say, trying different file extensions maybe. But I get the feeling it might be some temp file for a program on my system. You know, because the name is fatemp. I keep thinking about that "FA", and the only thing that acronym brings to my mind is FileAlyzer, and I do have that on my comp.

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I also have filealyzer but i never have those files created. Best i can say is maybe to use process monitor to monitor for that file name and let us know what creates it.

http://technet.microsoft.com/en-us/sysinternals/bb896645

Thanks! I think I lucked out and pinned it on FileAlyzer. Process Monitor didn't catch it, but I thought I'd open FileAlyzer's exe in a hex editor and do a text string search. There is a "fatemp-icon" text string in FileAlyzer.exe, so I guess that implies it's FileAlyzer that's been creating those files.

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