mirror of
https://github.com/valitydev/signature-base.git
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55 lines
1.8 KiB
Plaintext
55 lines
1.8 KiB
Plaintext
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rule EXT_SUSP_OBFUSC_macOS_RootHelper_Obfuscated {
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meta:
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author = "im0prtp3"
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description = "Yara for the public tool 'roothelper'. Used by XCSSET (https://gist.github.com/NullArray/f39b026b9e0d19f1e17390a244d679ec)"
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reference = "https://twitter.com/imp0rtp3/status/1401912205621202944"
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date = "2021-06-07"
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score = 65
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strings:
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$a1 = "E: neither argv[0] nor $_ works." fullword
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// Debug Strings - only available when compiled as debug
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$b1 = "shll=%s\n" fullword
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$b2 = "argv[%d]=%.60s\n" fullword
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$b3 = "getenv(%s)=%s\n" fullword
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$b4 = "argc=%d\n" fullword
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$b5 = "argv=<null>\n" fullword
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$c1 = "%s%s%s: %s\n" fullword
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$c2 = "x%lx" fullword
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$c3 = "=%lu %d" fullword
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$c4 = "%lu %d%c" fullword
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// Function names
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$f1 = "rmarg"
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$f2 = "chkenv"
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$f3 = "untraceable"
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$f4 = "arc4"
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/* $f5 = "xsh" fullword */
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$f6 = "stte"
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$f7 = "with_file"
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// "key" function
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$opcodes_1 = { 99 F7 7D ?? 4C 63 C2 42 0F B6 14 01 0F B6 3D }
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// "stte" function
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$opcodes_2 = { C6 [3] 00 00 00 C6 [3] 00 00 00 C6 [3] 00 00 00 8A 05 [2] 00 00 0F B6 [3] 00 00 89 CA }
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// "chkenv" function
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$opcodes_3 = { E8 [2] FF FF 8B 85 ?? F? FF FF 2B 85 ?? F? FF FF 83 ?? 01 89 85 ?? F? FF FF E9 ?? 00 00 00 }
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// "rmarg" function
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$weak_opcodes_1 = {48 8B 45 ?? 48 8B 00 48 3B 45 ?? 0F 95 C1 88 4D ??}
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$weak_opcodes_2 = { 48 8B 45 ?? 48 83 38 ?? 0F 95 C1 88 4D ?? } // rmarg
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condition:
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( uint32(0) == 0xfeedface or uint32(0) == 0xcefaedfe or uint32(0) == 0xfeedfacf or uint32(0) == 0xcffaedfe or uint32(0) == 0xcafebabe or uint32(0) == 0xbebafeca ) and (
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$a1 or
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3 of ($b*) or
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5 of ($f*) or
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all of ($opcodes*) or
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( 2 of ($b*) and ( 2 of ($c*) or 2 of ($opcodes*) ) ) or
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( 3 of ($c*) and 4 of ($f*) ) or
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( 2 of ($opcodes*) and ( all of ($weak_opcodes*) or 3 of ($c*) ) )
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)
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}
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