Re: CVE-2018-8162 rule

["Joel Esler \(jesler\) via Snort-sigs" <snort-sigs () lists snort org>]

Sevens,


In addition to what Mr Randolph said below:  Thanks for the information.  Can you file a false positive report by 
following the directions listed here: Submit a False 
Positive<https://blog.snort.org/2016/11/reporting-false-positives-with-snortorg.html>.  This will help us.  Thanks!

--
Joel Esler
Sr. Manager
Open Source, Design, Web, and Education
Talos Group
http://www.talosintelligence.com



On Jun 7, 2018, at 8:36 AM, David Randolph <drandolph () sourcefire com<mailto:drandolph () sourcefire com>> wrote:

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 () mil be<mailto:Benoit.Sevens () 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<http://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2018-8162>;
 
reference:url,technet.microsoft.com/en-us/security/bulletin/ms16-054<http://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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