Snort mailing list archives
Re: Win.Trojan.Nocturnal
From: John Levy <johlevy () sourcefire com>
Date: Tue, 12 Jun 2018 11:36:33 -0400
Hi Yaser, We reviewed your submissions for this one and decided to tweak the first rule just a little bit and add it to the community ruleset (sid 46895). Specifically, we first removed the check for the http_method. Second, we shortened each content-match to include just the parameter key and value, and we also shortened the total number of content matches. Lastly, we added a check for the specific URI used for our fast pattern. Thanks again for your contribution! Regards, John Levy Cisco Talos On Jun 4, 2018, at 1:24 PM, Y M via Snort-sigs <snort-sigs () lists snort org> wrote: Hi, Unfortunately, I don't have pcaps for these. # -------------------- # Date: 2018-06-01 # Title: Thief in the night: New Nocturnal Stealer grabs data on the cheap # Tests: syntax only # Reference: https://www.proofpoint.com/us/threat- insight/post/thief-night-new-nocturnal-stealer-grabs-data-cheap, https://www.virustotal.com/#/file/ae7e5a7b34dc216e9da384fcf9868a b2c1a1d731f583f893b2d2d4009da15a4e/detection alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Nocturnal outbound connection"; flow:to_server,established; content:"POST"; http_method; content:"Content-Disposition: form-data|3B| name=|22|hwid|22|"; fast_pattern:only; http_client_body; content:"Content-Disposition: form-data|3B| name=|22|os|22|"; http_client_body; content:"Content-Disposition: form-data|3B| name=|22|platform|22|"; http_client_body; content:"Content-Disposition: form-data|3B| name=|22|profile|22|"; http_client_body; content:"Content-Disposition: form-data|3B| name=|22|user|22|"; http_client_body; content:"Content-Disposition: form-data|3B| name=|22|pcount|22|"; http_client_body; content:"Content-Disposition: form-data|3B| name=|22|cccount|22|"; http_client_body; metadata:ruleset community, service http; reference:url,www.proofpoint. com/us/threat-insight/post/thief-night-new-nocturnal- stealer-grabs-data-cheap; classtype:trojan-activity; sid:8000096; rev:1;) alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC known malicious user-agent - Win.Trojan.Nocturnal"; flow:to_server,established; content:"User-Agent: Nocturnal/"; fast_pattern:only; http_header; metadata:ruleset community, service http; reference:url,www.proofpoint.com/us/threat-insight/post/ thief-night-new-nocturnal-stealer-grabs-data-cheap; classtype:trojan-activity; sid:8000097; rev:1;) Thanks. YM _______________________________________________ Snort-sigs mailing list Snort-sigs () lists snort org https://lists.snort.org/mailman/listinfo/snort-sigs Please visit http://blog.snort.org for the latest news about Snort! Please follow these rules: https://snort.org/faq/what-is-the-mailing-list- etiquette Visit the Snort.org <http://snort.org/> to subscribe to the official Snort ruleset, make sure to stay up to date to catch the most <a href=" https://snort.org/downloads/#rule-downloads">emerging threats</a>!
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Current thread:
- Win.Trojan.Nocturnal Y M via Snort-sigs (Jun 04)
- Re: Win.Trojan.Nocturnal John Levy (Jun 12)
- Re: Win.Trojan.Nocturnal Y M via Snort-sigs (Jun 12)
- Re: Win.Trojan.Nocturnal John Levy (Jun 12)