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rule win_mail_o_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { ff15???????? 83a3980e0000fd 4889bb800e0000 488bcb 4889bb800e0000 e8???????? 488b8b60100000 } // n = 7, score = 100 // ff15???????? | // 83a3980e0000fd | jne 0x1ffe // 4889bb800e0000 | mov dword ptr [esp + 0x28], 0x8d7 // 488bcb | dec eax // 4889bb800e0000 | mov ecx, ebx // e8???????? | // 488b8b60100000 | dec eax $sequence_1 = { ffc7 4883c302 493bde 7cd7 488b8c24a0000000 ba01000000 448d42fe } // n = 7, score = 100 // ffc7 | xor eax, eax // 4883c302 | dec eax // 493bde | mov ecx, ebx // 7cd7 | dec eax // 488b8c24a0000000 | mov edx, dword ptr [esp + 0x60] // ba01000000 | dec eax // 448d42fe | mov ecx, ebx $sequence_2 = { eb2e 488d15518b1500 488bcf e8???????? 85c0 7405 830b02 } // n = 7, score = 100 // eb2e | add esp, 0x30 // 488d15518b1500 | pop edi // 488bcf | dec eax // e8???????? | // 85c0 | mov ecx, dword ptr [ebx + 0x578] // 7405 | lea edx, [eax + 0x5c] // 830b02 | dec eax $sequence_3 = { e8???????? 8bf8 85c0 7563 488d15563e1700 488bcb e8???????? } // n = 7, score = 100 // e8???????? | // 8bf8 | mov edx, ebx // 85c0 | dec eax // 7563 | mov dword ptr [esp + 0x20], eax // 488d15563e1700 | inc ecx // 488bcb | mov ecx, 8 // e8???????? | $sequence_4 = { f30fe6d2 8bd7 e8???????? 03ef 85db 7ea1 2bdf } // n = 7, score = 100 // f30fe6d2 | dec eax // 8bd7 | mov dword ptr [esp + 0xd8], eax // e8???????? | // 03ef | dec eax // 85db | mov ebx, dword ptr [esp + 0x158] // 7ea1 | mov eax, edi // 2bdf | dec eax $sequence_5 = { 7cda 488b4f20 488bd6 e8???????? 4885c0 0f8459020000 418bec } // n = 7, score = 100 // 7cda | inc ecx // 488b4f20 | cmp bh, 1 // 488bd6 | jne 0x924 // e8???????? | // 4885c0 | dec eax // 0f8459020000 | mov ecx, esi // 418bec | inc esp $sequence_6 = { e9???????? 4183fd00 743e 492bed 4d8bc5 488bd5 488bcf } // n = 7, score = 100 // e9???????? | // 4183fd00 | mov eax, 5 // 743e | dec eax // 492bed | lea edx, [esp + 0x48] // 4d8bc5 | dec eax // 488bd5 | mov ecx, edi // 488bcf | dec eax $sequence_7 = { e8???????? b8ffffffff e9???????? 448b8c24a0000000 4183f901 746a 4c8d0578650900 } // n = 7, score = 100 // e8???????? | // b8ffffffff | add esp, 0x48 // e9???????? | // 448b8c24a0000000 | inc ecx // 4183f901 | pop esi // 746a | pop edi // 4c8d0578650900 | pop esi $sequence_8 = { bfffffffff e9???????? f7432000010000 4889742440 740f 488bd3 488d0da3050000 } // n = 7, score = 100 // bfffffffff | dec eax // e9???????? | // f7432000010000 | mov ecx, ebp // 4889742440 | dec eax // 740f | mov ebx, eax // 488bd3 | inc ecx // 488d0da3050000 | mov eax, 0x46 $sequence_9 = { 7442 488bce 4c8d2defdb0b00 0f1f4000 6666660f1f840000000000 410fb61408 48ffc1 } // n = 7, score = 100 // 7442 | inc ecx // 488bce | mov eax, 0x3a // 4c8d2defdb0b00 | dec eax // 0f1f4000 | lea edx, [0x14d0bf] // 6666660f1f840000000000 | inc ecx // 410fb61408 | lea ecx, [eax - 0x1a] // 48ffc1 | inc ecx condition: 7 of them and filesize < 5985280 }
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