alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32.Qakbot Update Request"; flow:established,to_server; http.uri; content:"/u/upd_"; content:"cb"; pcre:"/\x2Fu\x2Fupd\x5F(?:cb|.+\x2Ecb)/"; reference:url,www.symantec.com/content/en/us/enterprise/media/security_response/whitepapers/w32_qakbot_in_detail.pdf; reference:url,www.symantec.com/security_response/writeup.jsp?docid=2009-050707-0639-99; classtype:trojan-activity; sid:2012971; rev:3; metadata:created_at 2011_06_09, signature_severity Major, updated_at 2020_04_20;)