[Snort-sigs] Snort-sigs Digest, Vol 12, Issue 50

Mkultra mkultra75 at protonmail.com
Fri Jun 8 11:03:04 EDT 2018


rastus caint afford a "real" ids

Sent with [ProtonMail](https://protonmail.com) Secure Email.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On June 8, 2018 9:21 AM, Ashlee Benge <abenge at 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 at lists.snort.org> wrote:
>
>> Send Snort-sigs mailing list submissions to
>>         snort-sigs at lists.snort.org
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>>         https://lists.snort.org/mailman/listinfo/snort-sigs
>> or, via email, send a message with subject or body 'help' to
>>         snort-sigs-request at lists.snort.org
>>
>> You can reach the person managing the list at
>>         snort-sigs-owner at 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 at outlook.com>
>> To: snort-sigs <snort-sigs at lists.snort.org>
>> Subject: [Snort-sigs] Win.Trojan.Dropper
>> Message-ID:
>>         <BN6PR1701MB18437AD38F6A61C998EECA4AA86D0 at 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 at outlook.com>
>> To: snort-sigs <snort-sigs at lists.snort.org>
>> Subject: [Snort-sigs] CVE-2017-8570
>> Message-ID:
>>         <BN6PR1701MB184314ADF9539049956466D5A86D0 at 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 --------------
>> An HTML attachment was scrubbed...
>> URL: <https://lists.snort.org/pipermail/snort-sigs/attachments/20180529/aafa85a1/attachment.html>
>>
>> ------------------------------
>>
>> Subject: Digest Footer
>>
>> _______________________________________________
>> Snort-sigs mailing list
>> Snort-sigs at lists.snort.org
>> https://lists.snort.org/mailman/listinfo/snort-sigs
>> http://www.snort.org
>>
>> Please follow these rules: https://snort.org/faq/what-is-the-mailing-list-etiquette
>>
>> Please visit http://blog.snort.org for the latest news about Snort!
>>
>> ------------------------------
>>
>> End of Snort-sigs Digest, Vol 12, Issue 50
>> ******************************************
>
> --
> Ashlee Benge
> Detection Response Team
> Talos Group
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.snort.org/pipermail/snort-sigs/attachments/20180608/90028366/attachment-0001.html>


More information about the Snort-sigs mailing list