full-disclosure - Re: Cipher detection

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Message-ID: <20110408220249.GE12726@sentinelchicken.org>
Date: Fri, 8 Apr 2011 15:02:49 -0700
From: Tim <tim-security@...tinelchicken.org>
To: Maksim.Filenko@...b.com
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Cipher detection

> Here're some more examples:
> 
> dummy@...mple.com GGobQ2bsqd64PXVAmaDiDBg=
> eummy@...mple.com GWobQ2bsqd64PXVAmaDiDBg=
> dummy@...mple.co  GGobQ2bsqd64PXVAmaDiDA==
> dummy@...mple.@ex GGobQ2bsqd64PXVAmaDBBg0=
> dummy             GGobQ2Y=
> dumm              GGobQw==
> eummy             GWobQ2Y=
> eumm              GWobQw==
> example.com       GWcXQ2/AqYi6P2g=
> dxample.com       GGcXQ2/AqYi6P2g=
> 11111@...mple.com TS5HHy7sqd64PXVAmaDiDBg=
> 11111             TS5HHy4=
> 
> Looks like a base64+xor, am I right? And that's enough information for me. 

Yes, it is looking like a fixed key stream XORed with the plaintext.
Note that this could mean they're using any number of "good"
encryption algorithms (block cipher in OFB mode, stream cipher) with a
fixed IV.  This means the encryption is very broken, but it doesn't
necessarily mean they are using some half-baked custom obfuscation
technique.  They could be, but be careful with your accusations.

HTH,
tim

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