I'm trying to use a deugger (namely OllyDbg) to analyze some exe files.

However, all the versions I downloaded from the Internet are considered as Trojans by some anti-virus software. (I use www.virustotal.com to scan the binary I downloaded)

Are OllyDbg's main behaviors belong to a kind of Trojan?

Currently, I want to download OllyDbg v1.10 defixed (version from [potentialy harmful link] http://4server.info/download/4shared.com/rar/RFNpFbiP/ollydbg_v110_defixed.html)

Here is the scan result of "ollydbg v1.10 defixed.rar" by virustotal:

VirusTotal results

Does "ollydbg v1.10 defixed.rar" really contain Trojans?

  • 10
    Why don't you download it from the official site?
    – S.L. Barth
    Mar 3, 2015 at 14:55
  • 26
    Sure looks like it if VirusTotal says so! Don't download software from shady websites kids, espcially if you can download it from the official site for free ;)
    – Mints97
    Mar 3, 2015 at 14:56
  • 1
    The .rar format by itself is pretty unusual for legitimate software, and the 4shared link (generic file upload site) is the icing on the cake.
    – user42178
    Mar 3, 2015 at 16:03
  • I did have a problem with an NT/Nokia development kit, on Vista. The built-in MS virus detection (or was it Kaspersky?) was constantly removing pieces of the debugger. Finally figured out which knobs to turn. Can't tell you more since it's been about 4 years.
    – Hot Licks
    Mar 3, 2015 at 18:05

2 Answers 2


The link provided in the question seems really fishy. If it's a "patched" version supposed to get rid of limitation, it's more than probable the fixer added some kind of additional surprises (like a virus) in it. The official site already proposes a free version of the software, so I would start here to avoid getting a virus from a random stranger.

This being said, it's not impossible that anti-viruses detect innocuous programs as malwares. This happens cause AV checks for some known signatures of exploits and/or detects unusual behaviour, like access to some memory ranges for example.

Debuggers have these kinds of odd behaviours, as the need to bind to existing processes, de-route function calls, check and modify memory, etc.

  • 6
    Most antivirus consider legitimate cracks, not containing any undesired software, as "generic trojans". This is presumably to discourage their use and/or simply because it's, generally speaking, a risky category of software. Still, I think it's very wrong to intentionally erroneously classify software we don't like as a trojan. I obviously can't speak for this specific case. Mar 3, 2015 at 19:44
  • 2
    @AndreasBonini, a few years ago, when I used windows a lot more, it seemed to be the corporate security packages that flagged all cracked versions as malware while AVG free (which is what I used then) didn't.
    – Chris H
    Mar 3, 2015 at 19:49
  • 1
    @ChrisH Makes sense from a policy perspective: if you have a cracked executable on a work image, something has gone very wrong.
    – sapi
    Mar 3, 2015 at 22:13
  • I say the opposite of @AndreasBonini. While most cracks do what they claim to do, they also inject some kind of malware to the original software. I won't name them, but I have found a few of my own by sniffing the packets. Piracy is not 100% free.
    – AKS
    Mar 4, 2015 at 3:49
  • 1
    "legitimate cracks" - lol
    – piet.t
    Mar 4, 2015 at 7:43

These detections you see are false positives because the original DeFixed_Edition.rar (OllyDbg - FOFF Team Edition 2.0) is falsely detected by false positives too.

If you update the file PhantOm.dll (PhantOm Plugin) with an updated version of the plugin, you would see the number of false detections decreases significantly.

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