[Snort-sigs] CVE-2018-8162 rule

David Randolph drandolph at sourcefire.com
Thu Jun 7 08:36:16 EDT 2018


We’ll take a look! Thanks for the sha256, having the full file is a big help when we are analyzing these.

> On Jun 7, 2018, at 8:10 AM, Sevens Benoît <Benoit.Sevens at mil.be> wrote:
> 
> Hi all,
> 
> Our IDS has triggered on the HTTP download of an xls file with sha256: 714b5fba91302b5a6acfc4d659329dbde429f1fa4460970d60e76711da67b94a
> 
> The file can be downloaded from Virustotal
> 
> The rule that triggered was this one: 
> 
> alert tcp $EXTERNAL_NET $FILE_DATA_PORTS -> $HOME_NET any (msg:"FILE-OFFICE Microsoft Office Excel BOF memory disclosure attempt"; flow:to_client,established; flowbits:isset, file.xls; file_data; content:"|09 08 10 00 00 06 05 00|"; content:"|07|"; within:1; distance:3; byte_test:1,&,16, 0, relative; byte_test:1,&,1, 0, relative; byte_test:1,&,8, 0, relative; metadata:policy balanced-ips drop, policy max-detect-ips drop, policy security-ips drop, service ftp-data, service http, service imap, service pop3; reference:cve,2016-0140; reference:cve,2018-8162; reference:url,portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2018-8162; reference:url,technet.microsoft.com/en-us/security/bulletin/ms16-054; classtype:attempted-recon; sid:38785; rev:4;)
> 
> It is hard for us to say now if this is a false positive or not, taking into account the fact that exploits for these CVE's could not be found online.
> 
> Does anyone have more knowledge on this Snort signature in order to determine if this is a false positive or not?
> 
> Regards,
> 
> Benoit
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