Rule History

SID: 2050433 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 1 • Jan 24, 2024, 12:00 PM

Message:

ET EXPLOIT Possible Malicious x-sharing-config-url SMTP header observed (CVE-2023-35636)

Rule:

alert smtp any any -> $HOME_NET any (msg:"ET EXPLOIT Possible Malicious x-sharing-config-url SMTP header observed (CVE-2023-35636)"; flow:established,to_server; content:"Content-Class|3a 20|Sharing"; nocase; content:"x-sharing-config-url|3a 20|\\"; fast_pattern; nocase; content:".ics"; within:50; reference:url,www.varonis.com/blog/outlook-vulnerability-new-ways-to-leak-ntlm-hashes; reference:cve,2023-35636; classtype:credential-theft; sid:2050433; 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, cve CVE_2023_35636, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Low, signature_severity Major, updated_at 2024_01_24; target:dest_ip;)

Created:

Jan 24, 2024, 12:00 PM

Updated:

Jan 24, 2024, 12:00 PM

DB Created:

Jan 24, 2024, 11:00 PM

DB Updated:

Jan 24, 2024, 11:00 PM

Filename:

rules/emerging-exploit.rules