alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Jupyter Stealer CnC Checkin M2"; flow:established,to_server; http.start; content:"POST / HTTP/1.1|0d 0a|Host|3a 20|"; startswith; http.host.raw; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.header_names; bsize:46; content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a|Expect|0d 0a|Connection|0d 0a 0d 0a|"; fast_pattern; http.content_len; byte_test:0,>=,200,0,string,dec; byte_test:0,<=,999,0,string,dec; http.connection; bsize:10; content:"Keep-Alive"; http.request_body; content:!"|0d 0a|"; pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/"; reference:md5,772816f913a48aabe00ab1e7db8aa48e; reference:url,blogs.vmware.com/security/2023/11/jupyter-rising-an-update-on-jupyter-infostealer.html; classtype:trojan-activity; sid:2050051; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2024_01_12, deployment Perimeter, malware_family Stealer, malware_family Jupyter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system; target:src_ip;)