Rule History

alert smtp any any -> $HOME_NET any (msg:"ET SMTP Message Containing search-ms URI With crumb location Parameter In Message Body - Possible NTLM Hash Leak Attempt"; flow:established,to_server; content:"search-ms|3a 2f 2f|query"; content:"&crumb|3d|location|3a 5c 5c|"; fast_pattern; within:50; reference:url,www.varonis.com/blog/outlook-vulnerability-new-ways-to-leak-ntlm-hashes; classtype:credential-theft; sid:2050427; rev:1; 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_24, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence Low, signature_severity Major, updated_at 2024_01_24; target:dest_ip;)