ET MALWARE Observed BatLoader Domain (externalchecksso .com) in TLS SNI
Sourceet/open
CreatedJanuary 19, 2023
UpdatedJanuary 19, 2023
Classificationdomain-c2
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed BatLoader Domain (externalchecksso .com) in TLS SNI"; flow:established,to_server; tls.sni; content:"externalchecksso.com"; bsize:20; fast_pattern; reference:url,www.trendmicro.com/en_us/research/23/a/batloader-malware-abuses-legitimate-tools-uses-obfuscated-javasc.html; classtype:domain-c2; sid:2043360; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_01_19, deployment Perimeter, malware_family BatLoader, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_01_19, reviewed_at 2025_07_14;)
References
Metadata
affected productWindows_XP_Vista_7_8_10_Server_32_64_Bit
attack targetClient_Endpoint
created at2023_01_19
deploymentPerimeter
malware familyBatLoader
performance impactLow
confidenceHigh
signature severityMajor
updated at2023_01_19
reviewed at2025_07_14
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