Versions (4)
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Rev: 1 • Oct 4, 2021, 12:00 PMET MALWARE Wintervivern Retrieving Task
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Wintervivern Retrieving Task"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"vivern/"; fast_pattern; content:"/getcommand?username="; http.header_names; content:!"Referer"; reference:url,www.domaintools.com/resources/blog/winter-vivern-a-look-at-re-crafted-government-maldocs; reference:url,lab52.io/blog/winter-vivern-all-summer/; reference:md5,7940c343ae91e7198acf83400b25252f; classtype:trojan-activity; sid:2034107; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_10_04, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_04;)
Oct 4, 2021, 12:00 PM
Oct 4, 2021, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 8, 2025, 9:34 PM
rules/emerging-malware.rules