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111 lines
3.9 KiB
Plaintext
111 lines
3.9 KiB
Plaintext
/*
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Yara Rule Set
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Author: Florian Roth
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Date: 2017-09-14
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Identifier: Detects malicious files in releation with CVE-2017-8759
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Reference: https://github.com/Voulnet/CVE-2017-8759-Exploit-sample
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*/
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private rule RTFFILE {
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meta:
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description = "Detects RTF files"
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condition:
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uint32be(0) == 0x7B5C7274
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}
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/* Rule Set ----------------------------------------------------------------- */
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rule CVE_2017_8759_Mal_HTA {
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meta:
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description = "Detects malicious files related to CVE-2017-8759 - file cmd.hta"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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author = "Florian Roth"
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reference = "https://github.com/Voulnet/CVE-2017-8759-Exploit-sample"
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date = "2017-09-14"
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hash1 = "fee2ab286eb542c08fdfef29fabf7796a0a91083a0ee29ebae219168528294b5"
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strings:
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$x1 = "Error = Process.Create(\"powershell -nop cmd.exe /c" fullword ascii
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condition:
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( uint16(0) == 0x683c and filesize < 1KB and all of them )
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}
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rule CVE_2017_8759_Mal_Doc {
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meta:
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description = "Detects malicious files related to CVE-2017-8759 - file Doc1.doc"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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author = "Florian Roth"
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reference = "https://github.com/Voulnet/CVE-2017-8759-Exploit-sample"
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date = "2017-09-14"
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hash1 = "6314c5696af4c4b24c3a92b0e92a064aaf04fd56673e830f4d339b8805cc9635"
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strings:
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$s1 = "soap:wsdl=http://" ascii wide nocase
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$s2 = "soap:wsdl=https://" ascii wide nocase
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$s3 = "soap:wsdl=http%3A%2F%2F" ascii wide nocase
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$s4 = "soap:wsdl=https%3A%2F%2F" ascii wide nocase
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$c1 = "Project.ThisDocument.AutoOpen" fullword wide
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condition:
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uint16(0) == 0xcfd0 and filesize < 500KB and ( 1 of ($s*) and $c1 )
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}
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rule CVE_2017_8759_SOAP_via_JS {
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meta:
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description = "Detects SOAP WDSL Download via JavaScript"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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author = "Florian Roth"
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reference = "https://twitter.com/buffaloverflow/status/907728364278087680"
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date = "2017-09-14"
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score = 60
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strings:
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$s1 = "GetObject(\"soap:wsdl=https://" ascii wide nocase
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$s2 = "GetObject(\"soap:wsdl=http://" ascii wide nocase
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condition:
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( filesize < 3KB and 1 of them )
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}
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rule CVE_2017_8759_SOAP_Excel {
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meta:
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description = "Detects malicious files related to CVE-2017-8759"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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author = "Florian Roth"
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reference = "https://twitter.com/buffaloverflow/status/908455053345869825"
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date = "2017-09-15"
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score = 60
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strings:
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$s1 = "|'soap:wsdl=" ascii wide nocase
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condition:
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( filesize < 300KB and 1 of them )
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}
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rule CVE_2017_8759_SOAP_txt {
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meta:
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description = "Detects malicious file in releation with CVE-2017-8759 - file exploit.txt"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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author = "Florian Roth"
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reference = "https://github.com/Voulnet/CVE-2017-8759-Exploit-sample"
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date = "2017-09-14"
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hash1 = "840ad14e29144be06722aff4cc04b377364eeed0a82b49cc30712823838e2444"
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strings:
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$s1 = /<soap:address location="http[s]?:\/\/[^"]{8,140}.hta"/ ascii wide
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$s2 = /<soap:address location="http[s]?:\/\/[^"]{8,140}mshta.exe"/ ascii wide
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condition:
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( filesize < 200KB and 1 of them )
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}
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rule CVE_2017_8759_WSDL_in_RTF {
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meta:
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description = "Detects malicious RTF file related CVE-2017-8759"
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author = "Security Doggo @xdxdxdxdoa"
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reference = "https://twitter.com/xdxdxdxdoa/status/908665278199996416"
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date = "2017-09-15"
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strings:
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$doc = "d0cf11e0a1b11ae1"
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$obj = "\\objupdate"
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$wsdl = "7700730064006c003d00" nocase
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$http1 = "68007400740070003a002f002f00" nocase
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$http2 = "680074007400700073003a002f002f00" nocase
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$http3 = "6600740070003a002f002f00" nocase
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condition:
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RTFFILE and $obj and $doc and $wsdl and 1 of ($http*)
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}
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