[clamav-users] Same file, different signatures detected

[Micah Snyder (micasnyd)]

If you're concerned that they may be flagging with multiple signatures, you can also test using:

clamscan --allmatch

It will scan for as many signatures as possible instead of just returning the first one it finds.


Micah Snyder
ClamAV Development
Talos
Cisco Systems, Inc.


On Aug 7, 2018, at 7:35 AM, Joel Esler (jesler) <jesler at cisco.com<mailto:jesler at cisco.com>> wrote:

Correct.  Jar files are essentially zip files.

Sent from my iPhone

On Aug 7, 2018, at 07:00, Maarten Broekman <maarten.broekman at gmail.com<mailto:maarten.broekman at gmail.com>> wrote:

JAR files can be unpacked like tarballs so it is likely that there is a common file in each that matches those hashes.

Maarten
Sent from a tiny keyboard

On Aug 7, 2018, at 04:54, Albrecht, Peter <peter.albrecht at wirecard.com<mailto:peter.albrecht at wirecard.com>> wrote:

Hi,

I don't see how that is even remotely possibly. They are three completely different hash signatures:

[daily.hsb] 9027093eab2a193081a763001e947371:4292:Html.Malware.Agent-6625344-0:73
[daily.hsb] 5591165097d53565d4e5f4e9fda8241a:7367:Html.Malware.Agent-6625164-0:73
[daily.hsb] f4116176a108054001a0e29e2ea105e6:6996:Html.Malware.Agent-6625283-0:73

You should have already submitted this file to ClamAV as a false positive, so what was it's MD5 hash?

I have submitted two files which have been reported. Their MD5 sums are:

88cc3123fce88d61b7c2cdbfc33542c5  httpclient-4.3.3.jar
9221d898bfa2fa19fa9bc307351f34a1  storm-submit-tools-1.1.1.jar

Strangely, they are reported with the same signature. And after whitelisting the first
one, the second one is reported. And then the third ...

This started about 10 days ago, nothing has been reported before that.

Thanks,

Peter Albrecht
Senior Linux Administrator

Wirecard Service Technologies GmbH
Einsteinring 35 | 85609 Aschheim | Germany
Tel: +49 (0) 89 4424-191076
https://www.wirecard.com
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