Snort mailing list archives
Couple sigs
From: James Lay <jlay () slave-tothe-box net>
Date: Fri, 07 Sep 2012 12:06:03 -0600
So...I get really tired of malicious redirects, so here are a couple sigs: Maybe hidden iframes are all over the net...maybe not, but this one is specifically designed to catch stuff like the below: alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT Hidden iframe"; flow:to_client, established; file_data; content:"<iframe width=1 height=1 style=visibility|3a|hidden"; classtype:bad-unknown; sid:10000023; rev:1;) <iframe width=1 height=1 style=visibility:hidden src='http://www.redacted.com/wp-count.php?ref=redacted</iframe> this next one is to catch those pages that are just a single refresh line with a link to an IP...I see a lot of these types being pointed at from compromised (wordpess) sites...as I understand it file_data should make this sig search from the beginning of the response body...which is exactly where I want it to search and not say the middle of the page (I hope): alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"INDICATOR-COMPROMISE Page with only IP redirect, possible compromised site"; flow:to_client, established; file_data; content:"<html><head><meta http-equiv=|22|refresh"; pcre:"/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/sm"; classtype:bad-unknown; sid:10000024; rev:1;) <html><head><meta http-equiv="refresh" content="0;url=http://redacted/redacted"></meta></head></html> So far no FP's in my environment, your mileage may vary. As usual, comments, thoughts, improvements, hack & slash on these are welcome. Thanks all. James ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Snort-sigs mailing list Snort-sigs () lists sourceforge net https://lists.sourceforge.net/lists/listinfo/snort-sigs http://www.snort.org Please visit http://blog.snort.org for the latest news about Snort!
Current thread:
- Couple sigs James Lay (Sep 07)
- Re: Couple sigs Alex Kirk (Sep 10)
- Re: Couple sigs Alex Kirk (Sep 10)
- Re: Couple sigs James Lay (Sep 10)
- Re: Couple sigs Alex Kirk (Sep 10)
- Re: Couple sigs James Lay (Sep 10)
- Re: Couple sigs lists () packetmail net (Sep 10)
- Re: Couple sigs Alex Kirk (Sep 10)
- Re: Couple sigs lists () packetmail net (Sep 10)
- Re: Couple sigs Alex Kirk (Sep 10)
- Re: Couple sigs Alex Kirk (Sep 10)