rule TrojanDownloader_O97M_Obfuse_KRN_MTB{ meta: description = "TrojanDownloader:O97M/Obfuse.KRN!MTB,SIGNATURE_TYPE_MACROHSTR_EXT,05 00 05 00 05 00 00 01 00 " strings : $a_03_0 = {2e 4f 70 65 6e 20 22 67 65 74 22 2c 20 90 02 15 28 22 71 90 02 64 6e 22 29 2c 20 46 61 6c 73 65 90 00 } //01 00 $a_03_1 = {2e 53 61 76 65 54 6f 46 69 6c 65 20 90 02 0c 2c 20 90 02 0c 20 2b 20 90 00 } //01 00 $a_03_2 = {4d 73 67 42 6f 78 20 22 90 02 15 22 90 00 } //01 00 $a_01_3 = {26 20 22 22 20 3d 20 22 22 20 54 68 65 6e 20 45 78 69 74 20 46 75 6e 63 74 69 6f 6e } //01 00 & "" = "" Then Exit Function $a_01_4 = {3d 20 43 68 72 28 35 30 29 20 2b 20 43 68 72 28 34 38 29 20 2b 20 43 68 72 28 34 38 29 } //00 00 = Chr(50) + Chr(48) + Chr(48) condition: any of ($a_*) }