Snort mailing list archives
Possible Cerber False Negative
From: Kevin Ross <kevross33 () googlemail com>
Date: Wed, 7 Dec 2016 15:38:39 +0000
Hi, Looking at rule 38885 I don't think it would hit messages like hi008c1030 which I see from Cerber analyis of sample md5 39594fb96583d261ef4fcc1d76efc84c. The reason being primarily that dsize is set to 9 in the rule when this is 10 bytes long in these payloads. Pcre regex sets the hex to {6} but this would be fine without dsize although in this case it will be 7 rather than 6 bytes. Kind Regards, Kevin Ross
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