rule TrojanDownloader_O97M_Ursnif_AN_MTB{ meta: description = "TrojanDownloader:O97M/Ursnif.AN!MTB,SIGNATURE_TYPE_MACROHSTR_EXT,05 00 05 00 05 00 00 " strings : $a_03_0 = {26 20 22 5c [0-10] 2e 78 22 } //1 $a_03_1 = {3d 20 43 68 72 28 22 26 68 22 20 26 20 4d 69 64 28 [0-08] 2c 20 [0-06] 2c 20 [0-06] 29 29 } //1 $a_03_2 = {3d 20 22 74 [0-01] 6d 70 22 } //1 $a_01_3 = {3d 20 22 22 } //1 = "" $a_01_4 = {22 62 69 6e 2e 62 61 73 65 36 34 22 } //1 "bin.base64" condition: ((#a_03_0 & 1)*1+(#a_03_1 & 1)*1+(#a_03_2 & 1)*1+(#a_01_3 & 1)*1+(#a_01_4 & 1)*1) >=5 }