Re: Snort-sigs Digest, Vol 12, Issue 50

[Mkultra via Snort-sigs <snort-sigs () lists snort org>]

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On June 8, 2018 9:21 AM, Ashlee Benge <abenge () sourcefire com> wrote:

> Yaser,
>
>       We have reviewed the rules you submitted for CVE-2017-8570. Unfortunately, due to the obfuscation method used 
> in the samples and a lack of static content matches, performance concerns prevent us from adding these rules to the 
> ruleset.
>
> On Tue, May 29, 2018 at 1:24 PM, <snort-sigs-request () lists snort org> wrote:
>
> > Send Snort-sigs mailing list submissions to
> >         snort-sigs () lists snort org
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
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> >         snort-sigs-owner () lists snort org
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Snort-sigs digest..."
> >
> > Today's Topics:
> >
> >    1. Win.Trojan.Dropper (O C)
> >    2. CVE-2017-8570 (O C)
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Tue, 29 May 2018 17:23:40 +0000
> > From: O C <snort () outlook com>
> > To: snort-sigs <snort-sigs () lists snort org>
> > Subject: [Snort-sigs] Win.Trojan.Dropper
> > Message-ID:
> >         <BN6PR1701MB18437AD38F6A61C998EECA4AA86D0 () BN6PR1701MB1843 namprd17 prod outlook com>
> >
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Hi,
> >
> > This downloader uses a rather unique User-Agent. Pcap is available for this one.
> >
> > # --------------------
> > # Date: 2018-05-28
> > # Title: Win.Trojan.Dropper
> > # Tests: pcap
> > # Reference: 
> > https://www.virustotal.com/#/file/782cc4188618cf0c4815f85ea7873a004464095f5ed459b8d1579fa27ce5810e/detection
> >
> > alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC known malicious user-agent - 
> > Win.Trojan.Dropper"; flow:to_server,established; content:"User-Agent: HTTPREAD|0D 0A|"; fast_pattern:only; 
> > metadata:ruleset community, service http; 
> > reference:url,www.virustotal.com/#/file/782cc4188618cf0c4815f85ea7873a004464095f5ed459b8d1579fa27ce5810e/detection; 
> > classtype:trojan-activity; sid:8000074; rev:1;)
> >
> > Thanks.
> > YM
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL: <https://lists.snort.org/pipermail/snort-sigs/attachments/20180529/d40e7252/attachment-0001.html>
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Tue, 29 May 2018 17:24:12 +0000
> > From: O C <snort () outlook com>
> > To: snort-sigs <snort-sigs () lists snort org>
> > Subject: [Snort-sigs] CVE-2017-8570
> > Message-ID:
> >         <BN6PR1701MB184314ADF9539049956466D5A86D0 () BN6PR1701MB1843 namprd17 prod outlook com>
> >
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Hi,
> >
> > This one is similar to the existing signatures 45415 and 45416. The only difference is that is uses the StdOleLink 
> > Moniker as opposed to the Composite Moiker. There are 2 versions for each rule. The first one is without using PCRE. 
> > The samples I worked with had the moniker slightly manipulated, and PCRE was a perfect fit. Pcaps available for 
> > these.
> >
> > Note that the sample documents contain multiple exploits and not just one.
> >
> > # --------------------
> > # Date: 2018-05-06
> > # Title: CVE-2017-8570 StdOleLink
> > # Reference: 
> > https://www.virustotal.com/#/file/bebd4cd9aece49fbe6e7024e239638004358ff87d02f9bd4328993409da9e17c/detection, 
> > https://www.virustotal.com/#/file/af9ed7de1d9d9d38ee12ea2d3c62ab01a79c6f4b241c02110bac8a53ea9798b5/detection
> > # Tests: pcap
> >
> > alert tcp $EXTERNAL_NET $FILE_DATA_PORTS -> $HOME_NET any (msg:"FILE-OFFICE RTF StdOleLink Moniker object creation 
> > attempt - NON-PCRE"; flow:to_client,established; flowbits:isset,file.rtf; file_data; content:"|5C|objupdate"; 
> > content:"003000000000000C000000000000046"; distance:0; fast_pattern; nocase; 
> > content:"C6AFABEC197FD211978E0000F8757E2A"; distance:0; nocase; metadata:ruleset community, service ftp-data, 
> > service http, service imap, service pop3; reference:cve,2017-8570; 
> > reference:url,portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8570; 
> > reference:url,www.virustotal.com/#/file/bebd4cd9aece49fbe6e7024e239638004358ff87d02f9bd4328993409da9e17c/detection; 
> > reference:url,www.virustotal.com/#/file/af9ed7de1d9d9d38ee12ea2d3c62ab01a79c6f4b241c02110bac8a53ea9798b5/detection; 
> > classtype:attempted-user; sid:8000070; rev:1;)
> >
> > alert tcp $EXTERNAL_NET $FILE_DATA_PORTS -> $HOME_NET any (msg:"FILE-OFFICE RTF StdOleLink Moniker object creation 
> > attempt - PCRE"; flow:to_client,established; flowbits:isset,file.rtf; file_data; content:"|5C|objupdate"; 
> > content:"003000000000000C000000000000046"; distance:0; fast_pattern; nocase; pcre:"/[ABCDEF0-9\x20\x0a\x0d0a]{32}/"; 
> > distance:0; nocase; metadata:ruleset community, service ftp-data, service http, service imap, service pop3; 
> > reference:cve,2017-8570; reference:url,portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8570; 
> > reference:url,www.virustotal.com/#/file/bebd4cd9aece49fbe6e7024e239638004358ff87d02f9bd4328993409da9e17c/detection; 
> > reference:url,www.virustotal.com/#/file/af9ed7de1d9d9d38ee12ea2d3c62ab01a79c6f4b241c02110bac8a53ea9798b5/detection; 
> > classtype:attempted-user; sid:8000071; rev:1;)
> >
> > alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"FILE-OFFICE RTF StdOleLink Moniker object creation attempt - 
> > NON-PCRE"; flow:to_server,established; flowbits:isset,file.rtf; file_data; content:"|5C|objupdate"; 
> > content:"003000000000000C000000000000046"; distance:0; fast_pattern; nocase; 
> > content:"C6AFABEC197FD211978E0000F8757E2A"; distance:0; nocase; metadata:ruleset community, service ftp-data, 
> > service http, service imap, service pop3; reference:cve,2017-8570; 
> > reference:url,portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8570; 
> > reference:url,www.virustotal.com/#/file/bebd4cd9aece49fbe6e7024e239638004358ff87d02f9bd4328993409da9e17c/detection; 
> > reference:url,www.virustotal.com/#/file/af9ed7de1d9d9d38ee12ea2d3c62ab01a79c6f4b241c02110bac8a53ea9798b5/detection; 
> > classtype:attempted-user; sid:8000072; rev:1;)
> >
> > alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"FILE-OFFICE RTF StdOleLink Moniker object creation attempt - 
> > PCRE"; flow:to_server,established; flowbits:isset,file.rtf; file_data; content:"|5C|objupdate"; 
> > content:"003000000000000C000000000000046"; distance:0; fast_pattern; nocase; pcre:"/[ABCDEF0-9\x20\x0a\x0d0a]{32}/"; 
> > distance:0; nocase; metadata:ruleset community, service ftp-data, service http, service imap, service pop3; 
> > reference:cve,2017-8570; reference:url,portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8570; 
> > reference:url,www.virustotal.com/#/file/bebd4cd9aece49fbe6e7024e239638004358ff87d02f9bd4328993409da9e17c/detection; 
> > reference:url,www.virustotal.com/#/file/af9ed7de1d9d9d38ee12ea2d3c62ab01a79c6f4b241c02110bac8a53ea9798b5/detection; 
> > classtype:attempted-user; sid:8000073; rev:1;)
> >
> > Thanks.
> > YM
> >
> > -------------- next part --------------
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> >
> > ------------------------------
> >
> > Subject: Digest Footer
> >
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> >
> > ------------------------------
> >
> > End of Snort-sigs Digest, Vol 12, Issue 50
> > ******************************************
>
> --
> Ashlee Benge
> Detection Response Team
> Talos Group
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