ET WEB_SERVER LEMURLOOT WebShell Interaction Header - X-siLock-Step2/3 File Retrieval Request- Observed in MOVEit File Transfer - INBOUND
Sourceet/open
CreatedJune 2, 2023
UpdatedJune 2, 2023
Classificationattempted-admin
alert http $EXTERNAL_NET any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET WEB_SERVER LEMURLOOT WebShell Interaction Header - X-siLock-Step2/3 File Retrieval Request- Observed in MOVEit File Transfer - INBOUND"; flow:established,to_server; http.header_names; content:"|0d 0a|X-siLock-Comment|0d 0a|"; content:"|0d 0a|X-siLock-Step2|0d 0a|"; fast_pattern; nocase; content:"|0d 0a|X-siLock-Step3|0d 0a|"; threshold:type limit, count 1, seconds 300, track by_src; 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:attempted-admin; sid:2046052; rev:1; metadata:attack_target Web_Server, created_at 2023_06_02, deployment Perimeter, deployment SSLDecrypt, malware_family LEMURLOOT, performance_impact Low, confidence High, signature_severity Major, tag WebShell, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_06_02;)
References
Metadata
attack targetWeb_Server
created at2023_06_02
deploymentSSLDecrypt
malware familyLEMURLOOT
performance impactLow
confidenceHigh
signature severityMajor
tagDescription_Generated_By_Proofpoint_Nexus
updated at2023_06_02
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