69 lines
3.2 KiB
Text
69 lines
3.2 KiB
Text
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import "pe"
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rule SUSP_AdobePDF_SFX_Bitmap_Combo_Executable {
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meta:
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description = "Detects a suspicious executable that contains both a SFX icon and an Adobe PDF icon"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://mp.weixin.qq.com/s/3Pa3hiuZyQBspDzH0kGSHw"
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date = "2020-11-02"
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score = 60
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hash1 = "13655f536fac31e6c2eaa9e6e113ada2a0b5e2b50a93b6bbfc0aaadd670cde9b"
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id = "d2d078c9-fbe5-51f4-8f7e-5d943c5a8197"
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strings:
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/* Adobe PDF Icon Bitmap */
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$sc1 = { FF 00 CC FF FF 00 99 FF FF 00 66 FF FF 00 33 FF
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FF 80 00 FF FF 80 FF CC FF 80 CC CC FF C0 99 CC
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FF 80 66 CC FF 00 33 CC FF 00 00 CC FF 00 FF 99
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FF FF CC 99 FF FF 99 99 FF FF 66 99 FF FF 33 99
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FF 08 00 99 FF 88 FF 66 FF 88 CC 66 FF 88 99 66
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FF 88 66 66 FF 88 33 66 FF 05 00 66 FF 55 FF 33
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FF 55 CC 33 FF 55 99 33 FF 55 66 33 FF 58 33 33
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FF 01 00 33 FF 99 FF 00 FF 99 CC 00 FF 99 99 00
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FF 99 66 00 FF 58 33 00 FF 01 00 00 FF 99 FF FF
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CC 99 CC FF CC 99 99 FF CC 99 66 FF CC 58 33 FF
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CC 01 00 FF CC FF FF CC CC FF CC CC CC FF 99 CC
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CC FF 66 CC CC 58 33 CC CC 01 00 CC CC FF FF 99 }
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/* SFX Icon Bitmap */
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$sc2 = { 28 66 27 00 60 00 00 00 80 00 00 00 80 80 80 00
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C0 C0 C0 00 FF FF FF 00 FF FF FF 00 FF FF FF 00
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FF FF FF 00 FF FF FF 00 FF FF FF 00 FF FF FF 00
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FF FF FF 00 FF FF FF 00 5D 33 00 00 5D 33 00 00
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5D 33 00 00 5D 33 00 00 5D 33 00 00 5D 33 00 00
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5D 33 00 00 5D 33 00 00 5D 33 00 00 5D 33 00 00 }
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condition:
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uint16(0) == 0x5a4d and
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all of them
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and pe.number_of_signatures < 1
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}
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rule SUSP_AdobePDF_Bitmap_Executable {
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meta:
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description = "Detects a suspicious executable that contains a Adobe PDF icon and no shows no sign of actual Adobe software"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://mp.weixin.qq.com/s/3Pa3hiuZyQBspDzH0kGSHw"
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date = "2020-11-02"
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score = 60
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hash1 = "13655f536fac31e6c2eaa9e6e113ada2a0b5e2b50a93b6bbfc0aaadd670cde9b"
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id = "86ebadd4-64a8-5290-b45e-ac125a10ea66"
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strings:
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/* Adobe PDF Icon Bitmap */
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$sc1 = { FF 00 CC FF FF 00 99 FF FF 00 66 FF FF 00 33 FF
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FF 80 00 FF FF 80 FF CC FF 80 CC CC FF C0 99 CC
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FF 80 66 CC FF 00 33 CC FF 00 00 CC FF 00 FF 99
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FF FF CC 99 FF FF 99 99 FF FF 66 99 FF FF 33 99
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FF 08 00 99 FF 88 FF 66 FF 88 CC 66 FF 88 99 66
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FF 88 66 66 FF 88 33 66 FF 05 00 66 FF 55 FF 33
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FF 55 CC 33 FF 55 99 33 FF 55 66 33 FF 58 33 33
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FF 01 00 33 FF 99 FF 00 FF 99 CC 00 FF 99 99 00
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FF 99 66 00 FF 58 33 00 FF 01 00 00 FF 99 FF FF
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CC 99 CC FF CC 99 99 FF CC 99 66 FF CC 58 33 FF
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CC 01 00 FF CC FF FF CC CC FF CC CC CC FF 99 CC
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CC FF 66 CC CC 58 33 CC CC 01 00 CC CC FF FF 99 }
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/* Exclude actual Adobe software */
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$fp1 = "Adobe" ascii wide fullword
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condition:
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uint16(0) == 0x5a4d and
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$sc1 and not 1 of ($fp*)
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and pe.number_of_signatures < 1
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}
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