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