31 lines
792 B
Text
31 lines
792 B
Text
rule js_RATDispenser : downloader
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{
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meta:
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description = "JavaScript downloader resp. dropper delivering various RATs"
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reference = "https://threatresearch.ext.hp.com/javascript-malware-dispensing-rats-into-the-wild/"
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author = "HP Threat Research @HPSecurity"
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filetype = "JavaScript"
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maltype = "Downloader"
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date = "2021-05-27"
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strings:
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$a = /{(\d)}/
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$c1 = "/{(\\d+)}/g"
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$c2 = "eval"
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$c3 = "prototype"
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$d1 = "\\x61\\x64\\x6F\\x64\\x62\\x2E"
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$d2 = "\\x43\\x68\\x61\\x72\\x53\\x65\\x74"
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$d3 = "\\x54\\x79\\x70\\x65"
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$e1 = "adodb."
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$e2 = "CharSet"
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$e3 = "Type"
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$f1 = "arguments"
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$f2 = "this.replace"
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condition:
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#a > 50 and all of ($c*) and (any of ($d*) or any of ($e*)) and all of ($f*) and filesize < 2MB
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}
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