63 lines
1.9 KiB
Text
63 lines
1.9 KiB
Text
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// YARA rules Office DDE
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// NVISO 2017/10/10 - 2017/10/12
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// https://sensepost.com/blog/2017/macro-less-code-exec-in-msword/
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/* slowing down scanning
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rule Office_DDEAUTO_field {
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meta:
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description = "Detects DDE in MS Office documents"
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author = "NVISO Labs"
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reference = "https://blog.nviso.be/2017/10/11/detecting-dde-in-ms-office-documents/"
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date = "2017-10-12"
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score = 60
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strings:
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$a = /<w:fldChar\s+?w:fldCharType="begin"\/>.{1,1000}?\b[Dd][Dd][Ee][Aa][Uu][Tt][Oo]\b.{1,1000}?<w:fldChar\s+?w:fldCharType="end"\/>/
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condition:
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$a
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}
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rule Office_DDE_field {
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meta:
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description = "Detects DDE in MS Office documents"
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author = "NVISO Labs"
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reference = "https://blog.nviso.be/2017/10/11/detecting-dde-in-ms-office-documents/"
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date = "2017-10-12"
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score = 40
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strings:
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$a = /<w:fldChar\s+?w:fldCharType="begin"\/>.+?\b[Dd][Dd][Ee]\b.+?<w:fldChar\s+?w:fldCharType="end"\/>/
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condition:
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$a
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}
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*/
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rule Office_OLE_DDEAUTO {
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meta:
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description = "Detects DDE in MS Office documents"
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author = "NVISO Labs"
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reference = "https://blog.nviso.be/2017/10/11/detecting-dde-in-ms-office-documents/"
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date = "2017-10-12"
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score = 30
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id = "2ead3cc9-f517-5916-93c9-1393362aa45d"
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strings:
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$a = /\x13\s*DDEAUTO\b[^\x14]+/ nocase
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condition:
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uint32be(0) == 0xD0CF11E0 and $a
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}
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rule Office_OLE_DDE {
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meta:
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description = "Detects DDE in MS Office documents"
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author = "NVISO Labs"
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reference = "https://blog.nviso.be/2017/10/11/detecting-dde-in-ms-office-documents/"
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date = "2017-10-12"
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score = 50
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id = "2ead3cc9-f517-5916-93c9-1393362aa45d"
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strings:
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$a = /\x13\s*DDE\b[^\x14]+/ nocase
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$r1 = { 52 00 6F 00 6F 00 74 00 20 00 45 00 6E 00 74 00 72 00 79 }
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$r2 = "Adobe ARM Installer"
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condition:
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uint32be(0) == 0xD0CF11E0 and $a and not 1 of ($r*)
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}
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