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26 lines
1.0 KiB
Plaintext
26 lines
1.0 KiB
Plaintext
rule gen_unicorn_obfuscated_powershell {
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meta:
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description = "PowerShell payload obfuscated by Unicorn toolkit"
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author = "John Lambert @JohnLaTwC"
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date = "2018-04-03"
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hash = "b93d2fe6a671a6a967f31d5b3a0a16d4f93abcaf25188a2bbdc0894087adb10d"
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hash2 = "1afb9795cb489abce39f685a420147a2875303a07c32bf7eec398125300a460b"
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reference = "https://github.com/trustedsec/unicorn/"
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strings:
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$h1 = "powershell"
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$sa1 = ".value.toString() 'JAB"
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$sa2 = ".value.toString() ('JAB"
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$sb1 = "-w 1 -C \"s"
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$sb2 = "/w 1 /C \"s"
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condition:
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filesize < 20KB
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and uint32be(0) == 0x706f7765
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and $h1 at 0
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and (
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uint16be(filesize-2) == 0x2722 or /* Footer 1 */
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( uint16be(filesize-2) == 0x220a and uint8(filesize-3) == 0x27 ) or /* Footer 2 */
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( uint16be(filesize-2) == 0x2922 and uint8(filesize-3) == 0x27 ) /* Footer 3 */
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)
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and ( 1 of ($sa*) and 1 of ($sb*) )
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}
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