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rule win_mail_o_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.mail_o." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mail_o" malpedia_rule_date = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { e8???????? 488bd8 4885c0 752d 4c8d0d40101200 c744242032000000 ba80000000 } // n = 7, score = 100 // e8???????? | // 488bd8 | lea edx, [0x11bc09] // 4885c0 | dec eax // 752d | mov ecx, esi // 4c8d0d40101200 | dec eax // c744242032000000 | add esi, eax // ba80000000 | cmp byte ptr [esi], 0xa $sequence_1 = { e8???????? 4863c8 488d4701 4803d9 483bd8 740a c7442420c2000000 } // n = 7, score = 100 // e8???????? | // 4863c8 | mov ebx, eax // 488d4701 | dec eax // 4803d9 | test eax, eax // 483bd8 | je 0x1423 // 740a | dec eax // c7442420c2000000 | mov edi, ecx $sequence_2 = { e9???????? 418b06 8983c00d0000 e9???????? 418b06 ffc8 83f80a } // n = 7, score = 100 // e9???????? | // 418b06 | dec eax // 8983c00d0000 | mov eax, esi // e9???????? | // 418b06 | dec eax // ffc8 | lea ecx, [ecx + 1] // 83f80a | test al, al $sequence_3 = { c744244007000000 7412 c7442430000000c0 c744244405000000 eb10 c744243000000080 c744244401000000 } // n = 7, score = 100 // c744244007000000 | cmp dword ptr [ecx], 0 // 7412 | je 0x1421 // c7442430000000c0 | dec eax // c744244405000000 | mov ecx, ebx // eb10 | dec eax // c744243000000080 | mov ebx, ecx // c744244401000000 | dec eax $sequence_4 = { ff542438 488b442448 48314310 488b442450 48314318 0fb6442430 8803 } // n = 7, score = 100 // ff542438 | add eax, eax // 488b442448 | dec ebp // 48314310 | mov dword ptr [edi], eax // 488b442450 | dec eax // 48314318 | cmp dword ptr [ebx + 0x450], 0 // 0fb6442430 | dec ecx // 8803 | mov dword ptr [edi + 0x20], eax $sequence_5 = { e9???????? 4885db 0f8449010000 0f1f840000000000 33d2 33c0 4885db } // n = 7, score = 100 // e9???????? | // 4885db | dec ecx // 0f8449010000 | cmp eax, edi // 0f1f840000000000 | jb 0xfbb // 33d2 | dec eax // 33c0 | lea eax, [esp + 0x20] // 4885db | dec eax $sequence_6 = { e8???????? 41b8b2010000 488d15fe010e00 498bcf e8???????? 498bcc e8???????? } // n = 7, score = 100 // e8???????? | // 41b8b2010000 | dec eax // 488d15fe010e00 | cmp ebx, eax // 498bcf | dec eax // e8???????? | // 498bcc | mov ebp, edx // e8???????? | $sequence_7 = { e9???????? 498b06 48898340070000 e9???????? 498b00 48898150070000 e9???????? } // n = 7, score = 100 // e9???????? | // 498b06 | mov ecx, ebp // 48898340070000 | dec eax // e9???????? | // 498b00 | lea ecx, [esp + 0x5c] // 48898150070000 | dec eax // e9???????? | $sequence_8 = { e8???????? 85c0 0f8423010000 488bd7 488d4c2450 e8???????? 85c0 } // n = 7, score = 100 // e8???????? | // 85c0 | lea edx, [0xc5e5e] // 0f8423010000 | inc ecx // 488bd7 | mov eax, 0x75 // 488d4c2450 | dec eax // e8???????? | // 85c0 | lea edx, [0x106e74] $sequence_9 = { e8???????? 4885c0 7525 baa4000000 c7442420c7000000 4c8d0d9a6e0b00 8d4806 } // n = 7, score = 100 // e8???????? | // 4885c0 | cmp eax, 1 // 7525 | je 0xa12 // baa4000000 | mov edx, 0x50 // c7442420c7000000 | mov dword ptr [esp + 0x28], 0x29 // 4c8d0d9a6e0b00 | dec eax // 8d4806 | lea eax, [0x12880e] condition: 7 of them and filesize < 5985280 }
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