54 lines
1.5 KiB
Text
54 lines
1.5 KiB
Text
/*
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Yara Rule Set
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Author: Florian Roth
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Date: 2016-07-31
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Identifier: Transformed Strings
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*/
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/* Rule Set ----------------------------------------------------------------- */
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rule Typical_Malware_String_Transforms {
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meta:
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description = "Detects typical strings in a reversed or otherwise modified form"
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author = "Florian Roth"
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reference = "Internal Research"
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date = "2016-07-31"
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score = 60
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strings:
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/* Executables */
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$e1 = "exe.tsohcvs" fullword ascii
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$e2 = "exe.ssasl" fullword ascii
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$e3 = "exe.rerolpxe" fullword ascii
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$e4 = "exe.erolpxei" fullword ascii
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$e5 = "exe.23lldnur" fullword ascii
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$e6 = "exe.dmc" fullword ascii
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$e7 = "exe.llikksat" fullword ascii
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/* Libraries */
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$l1 = "lld.23lenreK" fullword ascii
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$l2 = "lld.ESABLENREK" fullword ascii
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$l3 = "lld.esabtpyrc" fullword ascii
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$l4 = "lld.trcvsm" fullword ascii
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$l5 = "LLD.LLDTN" fullword ascii
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/* Imports */
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$i1 = "paeHssecorPteG" fullword ascii
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$i2 = "sserddAcorPteG" fullword ascii
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$i3 = "AyrarbiLdaoL" fullword ascii
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$i4 = "AssecorPetaerC" fullword ascii
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/* Registry */
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$r1 = "teSlortnoCtnerruC" fullword ascii
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$r2 = "nuR\\noisreVtnerruC" fullword ascii
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/* Folders */
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$f1 = "\\23metsys\\" ascii
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$f2 = "\\23metsyS\\" ascii
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$f3 = "niB.elcyceR$" fullword ascii
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$f4 = "%tooRmetsyS%" fullword ascii
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/* False Positives */
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$fp1 = "Application Impact Telemetry Static Analyzer" fullword wide
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condition:
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( uint16(0) == 0x5a4d and 1 of them and not 1 of ($fp*) )
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}
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