20 lines
848 B
Text
20 lines
848 B
Text
rule general_java_encoding_and_classloader : Webshells General
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{
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meta:
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author = "threatintel@volexity.com"
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description = "Identifies suspicious java-based files which have all the ingredients required for a webshell."
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reference = "https://www.volexity.com/blog/2022/06/15/driftingcloud-zero-day-sophos-firewall-exploitation-and-an-insidious-breach/"
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date = "2022-04-07"
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hash1 = "0d5dc54ef77bc18c4c5582dca4619905605668cffcccc3829e43c6d3e14ef216"
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license = "See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt"
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memory_suitable = 0
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strings:
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$s1 = "javax.crypto.spec.SecretKeySpec" ascii
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$s2 = "java/security/SecureClassLoader" ascii
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$s3 = "sun.misc.BASE64Decoder" ascii
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condition:
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filesize < 50KB and
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all of them
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}
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