Re: Zyns iframer

["ILLG, FREDERICK C" <fi763c () att com>]

Please remove me from the snort email distros.

Thank you!

Frederick Illg
Senior Specialist, Technology Security
Global Emerging Services - Security & Advanced Applications
AT&T Services, Inc.



From: Tyler Montier [mailto:tmontier () sourcefire com]
Sent: Monday, February 20, 2017 4:42 PM
To: Y M <snort () outlook com>
Cc: snort-sigs <snort-sigs () lists sourceforge net>
Subject: Re: [Snort-sigs] Zyns iframer

Yaser,

Thanks for your submission. We will review the rules and get back to you when they're finished.

Sincerely,

Tyler Montier
Cisco Talos

On Mon, Feb 20, 2017 at 2:50 PM, Y M <snort () outlook com<mailto:snort () outlook com>> wrote:
Hello,

The below signatures are derived from the analysis in the reference. While the EKs pushed by the iframer may be already 
detected by dedicated/existing signatures, the article also mentions that the iframer has also been used in 
malversting, hence the signatures below. The article also mentions a 2016 network traffic from the 
malware-traffic-analysis website. I used that pcap to test the "/linkx.php" detection and things seem to be function as 
expected.

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"INDICATOR-COMPROMISE Zyns iframer rediector gate request"; 
flow:to_server,established; urilen:14; content:"GET"; http_method; content:"/out.php?sid="; fast_pattern:only; 
http_uri; pcre:"/\/out\.php\x3fsid\x3d[0-9]$/imU"; content:"Referer"; http_header; flowbits:set,zyns.iframer; 
metadata:ruleset community, service http; 
reference:url,blog.malwarebytes.com/threat-analysis/2017/01/a-look-back-at-the-zyns-iframer-campaign/<https://urldefense.proofpoint.com/v2/url?u=http-3A__blog.malwarebytes.com_threat-2Danalysis_2017_01_a-2Dlook-2Dback-2Dat-2Dthe-2Dzyns-2Diframer-2Dcampaign_&d=DQMFaQ&c=LFYZ-o9_HUMeMTSQicvjIg&r=fQWGiSBcXmVjKDEHrPupbQ&m=cTm-mT9REoK7_CHgZQ7zfhFddF3iZhTPbRIKTDOxa30&s=hKGDkvqEYkJrpFArX3nBWtKBdN-v6S6_cwXzqX0YLsQ&e=>;
 classtype:trojan-activity; sid:1000856; rev:1;)

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"INDICATOR-COMPROMISE Zyns iframer rediector gate request"; 
flow:to_server,established; urilen:9<>10; content:"GET"; http_method; content:"/link"; fast_pattern:only; http_uri; 
pcre:"/\/link[a-z]{0,1}\.php$/imU"; content:"Referer"; http_header; flowbits:set,zyns.iframer; metadata:ruleset 
community, service http; 
reference:url,blog.malwarebytes.com/threat-analysis/2017/01/a-look-back-at-the-zyns-iframer-campaign/<https://urldefense.proofpoint.com/v2/url?u=http-3A__blog.malwarebytes.com_threat-2Danalysis_2017_01_a-2Dlook-2Dback-2Dat-2Dthe-2Dzyns-2Diframer-2Dcampaign_&d=DQMFaQ&c=LFYZ-o9_HUMeMTSQicvjIg&r=fQWGiSBcXmVjKDEHrPupbQ&m=cTm-mT9REoK7_CHgZQ7zfhFddF3iZhTPbRIKTDOxa30&s=hKGDkvqEYkJrpFArX3nBWtKBdN-v6S6_cwXzqX0YLsQ&e=>;
 classtype:trojan-activity; sid:1000857; rev:1;)

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"INDICATOR-COMPROMISE Zyns iframer redirector gate response"; 
flow:to_client,established; flowbits:isset,zyns.iframer; content:"200"; http_stat_code; content:" (@RELEASE@)|0D 0A|"; 
http_header; content:"X-Powered-By|3A 20|PHP/"; http_header; file_data; content:"|3C|iframe src=|22|"; 
content:"width=|22|468|22| height=|22|60|22|"; within:500; content:"style=|22|position:absolute|3B|left:-10000px|3B 
22|"; distance:0; metadata:ruleset community, service http; 
reference:url,blog.malwarebytes.com/threat-analysis/2017/01/a-look-back-at-the-zyns-iframer-campaign/<https://urldefense.proofpoint.com/v2/url?u=http-3A__blog.malwarebytes.com_threat-2Danalysis_2017_01_a-2Dlook-2Dback-2Dat-2Dthe-2Dzyns-2Diframer-2Dcampaign_&d=DQMFaQ&c=LFYZ-o9_HUMeMTSQicvjIg&r=fQWGiSBcXmVjKDEHrPupbQ&m=cTm-mT9REoK7_CHgZQ7zfhFddF3iZhTPbRIKTDOxa30&s=hKGDkvqEYkJrpFArX3nBWtKBdN-v6S6_cwXzqX0YLsQ&e=>;
 classtype:trojan-activity; sid:1000858; rev:1;)

Thank you.
YM


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