ET WEB_SERVER LEMURLOOT WebShell Interaction Header - X-siLock-Step1 -1 Data Exfil Response - Observed in MOVEit File Transfer - OUTBOUND (Active Compromise)
Sourceet/open
Fileemerging-web_server.rules
CreatedJune 2, 2023
UpdatedApril 26, 2024
Classificationsuccessful-admin
alert http [$HOME_NET,$HTTP_SERVERS] any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER LEMURLOOT WebShell Interaction Header - X-siLock-Step1 -1 Data Exfil Response - Observed in MOVEit File Transfer - OUTBOUND (Active Compromise)"; flow:established,to_client ; http.header_names; to_lowercase; content:"|0d 0a|x-silock-comment|0d 0a|"; content:"|0d 0a|azureblobstorageaccount|0d 0a|"; content:"|0d 0a|azureblobkey|0d 0a|"; content:"|0d 0a|azureblobcontainer|0d 0a|"; fast_pattern; nocase; reference:url,www.huntress.com/blog/moveit-transfer-critical-vulnerability-rapid-response ; reference:url,community.progress.com/s/article/MOVEit-Transfer-Critical-Vulnerability-31May2023 ; reference:md5,af136505d384c9a89635b365e55b7fa3 ; reference:url,www.mandiant.com/resources/blog/zero-day-moveit-data-theft ; classtype:successful-admin; sid:2046050; rev:2; metadata:attack_target Web_Server, created_at 2023_06_02, deployment Perimeter, deployment SSLDecrypt, malware_family LEMURLOOT, performance_impact Low, confidence High, signature_severity Critical, tag WebShell, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_26; target:src_ip;)
References
Metadata
attack targetWeb_Server
created at2023_06_02
deploymentSSLDecrypt
malware familyLEMURLOOT
performance impactLow
confidenceHigh
signature severityCritical
tagDescription_Generated_By_Proofpoint_Nexus
updated at2024_04_26
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