2012/10/06 15:57:16 Steam - DETECTION #:\#\Steam\bin\avutil-51.dll Trojan.Fakesig

[pocketjazzy]

2012/10/06 15:57:16 -0400 ### ### DETECTION #:\#\Steam\bin\avutil-51.dll Trojan.Fakesig QUARANTINE

There is now a thread on the steam forums regarding this issue. There are multiple reports of users encountering this probable false positive. According to some, it is continuously getting re-downloaded by steams auto update feature. So their MBAM logs are getting spammed a bit.

If you need anything else from me, like logs or reports please have an admin email my account email address as I will not be monitoring this thread.

The steam thread is here http://forums.steampowered.com/forums/showthread.php?p=33025932

Thanks,

Pocketjazzy

[Guest Bugen]

More info

Malwarebytes Anti-Malware (PRO) 1.65.0.1400

www.malwarebytes.org

Database version: v2012.10.06.05

Windows 7 Service Pack 1 x64 NTFS

Internet Explorer 9.0.8112.16421

xxxxx :: xxxxx-PC [administrator]

Protection: Enabled

10/6/2012 1:28:26 PM

mbam-log-2012-10-06 (13-29-05).txt

Scan type: Flash scan

Scan options enabled: Memory | Startup | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM | P2P

Scan options disabled: Registry | File System

Objects scanned: 166134

Time elapsed: 33 second(s)

Memory Processes Detected: 0

(No malicious items detected)

Memory Modules Detected: 1

C:\Program Files (x86)\Steam\bin\avutil-51.dll (Trojan.Fakesig) -> No action taken. [728bdab2500d75c19740f7d2dc249868]

Registry Keys Detected: 0

(No malicious items detected)

Registry Values Detected: 0

(No malicious items detected)

Registry Data Items Detected: 0

(No malicious items detected)

Folders Detected: 0

(No malicious items detected)

Files Detected: 1

C:\Program Files (x86)\Steam\bin\avutil-51.dll (Trojan.Fakesig) -> No action taken. [728bdab2500d75c19740f7d2dc249868]

Here are the 4 files all the same just different detections

C:\Users\****\Desktop\avutil-51 (2).dll (Trojan.Fakesig) -> No action taken. [cd30f59763fac27437a059701be559a7]

C:\Users\****Desktop\avutil-51 (3).dll (Trojan.Fakesig) -> No action taken. [2fce246808552511fbdca029ad5303fd]

C:\Users\****\Desktop\avutil-51 (4).dll (Trojan.Fakesig) -> No action taken. [2ecf612b3924310527b0b217946ca957]

C:\Users\****\Desktop\avutil-51.dll (Trojan.Fakesig) -> No action taken. [b24bd4b8f6673ef8a0373990af5127d9]

virustotal

https://www.virustot...d175a/analysis/

Here are the four files

avutil-51 (4).zip

[pocketjazzy]

I'm sorry I forgot to include the log as well as the .zip files.

I have attached both the log and the zip's to this post.

Thanks,

Pocketjazzy

avutil-51.zip

mbam-log-2012-10-06 (16-40-31).txt

avutil-51.dll.1349308488.zip

[john314]

I got 6 hits for the file:

Malwarebytes Anti-Malware (PRO) 1.65.0.1400

www.malwarebytes.org

Database version: v2012.10.06.05

Windows 7 Service Pack 1 x64 NTFS

Internet Explorer 9.0.8112.16421

Protection: Enabled

10/6/2012 3:52:07 PM

mbam-log-2012-10-06 (16-38-49).txt

Scan type: Full scan (C:\|)

Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM

Scan options disabled: P2P

Objects scanned: 488855

Time elapsed: 46 minute(s), 26 second(s)

Memory Processes Detected: 0

(No malicious items detected)

Memory Modules Detected: 0

(No malicious items detected)

Registry Keys Detected: 0

(No malicious items detected)

Registry Values Detected: 0

(No malicious items detected)

Registry Data Items Detected: 0

(No malicious items detected)

Folders Detected: 0

(No malicious items detected)

Files Detected: 6

C:\Program Files (x86)\Steam\avutil-51.dll (Trojan.Fakesig) -> No action taken. [17e60a8293ca999da82f6861a35d629e]

C:\Program Files (x86)\Steam\old\avutil-51.dll.1345594691 (Trojan.Fakesig) -> No action taken. [7b82ff8d4d1020168750408977898779]

C:\Program Files (x86)\Steam\old\avutil-51.dll.1345761927 (Trojan.Fakesig) -> No action taken. [b7461676baa34de9b126567356aa08f8]

C:\Program Files (x86)\Steam\old\avutil-51.dll.1346877015 (Trojan.Fakesig) -> No action taken. [e01d513bd38ae155d9fe5b6e6e927a86]

C:\Program Files (x86)\Steam\old\avutil-51.dll.1347051250 (Trojan.Fakesig) -> No action taken. [ef0e0a82aeafbc7a37a0f6d344bc21df]

C:\Program Files (x86)\Steam\old\avutil-51.dll.1349310303 (Trojan.Fakesig) -> No action taken. [5e9face0c19ccf67a03726a31fe1ce32]

(end)

[Nyphem]

Yes, I'm getting this one too in a couple games, virus total saying it's clean https://www.virustotal.com/file/c9403a9d5d951629635a697487e965ed349067de205bb9b9fb4cdd3fc08af875/analysis/1349556105/ so pretty sure it's FP

[john314]

Here are my files that got hits.

avutil-51.zip

old.rar

[siopiliour]

I got the same. I hope this gets fixed soon. It looks like Malwarebytes is not the only that attacking the same bin folder. Avast is attacking it too.

[Storm_Surge]

Oh i thought i was the only one getting the false positive

[shadowwar]

this should be fixed now. Please update and it should no longer be detected.

[pocketjazzy]

Thanks Shadowwar! As soon as my account over on the steam forums gets authorized I'll pass the news along.

[shadowwar]

Your quite welcome. If this ever happens again please feel free to let us know in this forum asap. We aim to fix these as fast as possible.

[j3t1c0]

I do not think it's a false positive because after uninstalling steam, did a full scan with malwarebytes and the file was moved to another folder.

[shadowwar]

This is a confirmed false positive. Please reupdate and scan that file again.