17 lines
969 B
Text
17 lines
969 B
Text
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// Copyright 2021 by FireEye, Inc.
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// You may not use this file except in compliance with the license. The license should have been received with this file.
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rule FE_Webshell_PL_ATRIUM_1
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{
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meta:
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author = "Mandiant"
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date_created = "2021-04-16"
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md5 = "ca0175d86049fa7c796ea06b413857a3"
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reference_url = "https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html"
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strings:
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$s1 = "CGI::param("
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$s2 = "system("
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$s3 = /if[\x09\x20]{0,32}\(CGI::param\([\x22\x27]\w{1,64}[\x22\x27]\)\)\s{0,128}\{[\x09\x20]{0,32}print [\x22\x27]Cache-Control: no-cache\\n[\x22\x27][\x09\x20]{0,32};\s{0,128}print [\x22\x27]Content-type: text\/html\\n\\n[\x22\x27][\x09\x20]{0,32};\s{0,128}my \$\w{1,64}[\x09\x20]{0,32}=[\x09\x20]{0,32}CGI::param\([\x22\x27]\w{1,64}[\x22\x27]\)[\x09\x20]{0,32};\s{0,128}system\([\x22\x27]\$/
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condition:
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all of them
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}
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