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25 lines
1.1 KiB
Plaintext
25 lines
1.1 KiB
Plaintext
/* Slightly modified by Florian Roth */
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rule gen_excel_xor_obfuscation_velvetsweatshop {
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meta:
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description = "Detect XOR encryption (c. 2003) in Excel file formats"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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author = "@BouncyHat"
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contributed_by = "@JohnLaTwc"
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date = "2020-10-09"
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reference = "https://twitter.com/JohnLaTwC/status/1314602421977452544"
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reference0 = "https://twitter.com/BouncyHat/status/1308896366782042113"
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hash1 = "da1999c23ee2dae02a169fd2208b9766cb8f046a895f5f52bed45615eea94da0"
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hash2 = "14a32b8a504db3775e793be59d7bd5b584ea732c3ca060b2398137efbfd18d5a"
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hash3 = "dd3e89e7bde993f6f1b280f2bf933a5cc2797f4e8736aed4010aaf46e9854f23"
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hash4 = "4e40253b382b20e273edf82362f1c89e916f7ab8d3c518818a76cb6127d4e7c2"
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strings:
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$olemarker = { D0 CF 11 E0 A1 B1 1A E1 00 00 00 }
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$FilePass_XOR_Obfuscation_VelvetSweatshop = { 2F 00 06 00 00 00 59 B3 0A 9A }
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condition:
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uint32(0) == 0xe011cfd0 and
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filesize < 400KB and
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$olemarker at 0 and
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$FilePass_XOR_Obfuscation_VelvetSweatshop
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}
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