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rule win_getmail_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.getmail." 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.getmail" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 896c2460 e8???????? 8d4c2420 8d9424cc000000 51 8d8424a8000000 52 } // n = 7, score = 100 // 896c2460 | mov dword ptr [esp + 0x60], ebp // e8???????? | // 8d4c2420 | lea ecx, [esp + 0x20] // 8d9424cc000000 | lea edx, [esp + 0xcc] // 51 | push ecx // 8d8424a8000000 | lea eax, [esp + 0xa8] // 52 | push edx $sequence_1 = { c68424d000000004 8b040a 813803000930 7508 8b5808 d1eb 80e301 } // n = 7, score = 100 // c68424d000000004 | mov byte ptr [esp + 0xd0], 4 // 8b040a | mov eax, dword ptr [edx + ecx] // 813803000930 | cmp dword ptr [eax], 0x30090003 // 7508 | jne 0xa // 8b5808 | mov ebx, dword ptr [eax + 8] // d1eb | shr ebx, 1 // 80e301 | and bl, 1 $sequence_2 = { 55 ffd7 68???????? 55 a3???????? ffd7 8b0d???????? } // n = 7, score = 100 // 55 | push ebp // ffd7 | call edi // 68???????? | // 55 | push ebp // a3???????? | // ffd7 | call edi // 8b0d???????? | $sequence_3 = { 50 8b10 ff5208 391d???????? 0f84a2000000 a1???????? } // n = 6, score = 100 // 50 | push eax // 8b10 | mov edx, dword ptr [eax] // ff5208 | call dword ptr [edx + 8] // 391d???????? | // 0f84a2000000 | je 0xa8 // a1???????? | $sequence_4 = { 0f8285feffff 33db 50 e8???????? 83c404 8b442458 50 } // n = 7, score = 100 // 0f8285feffff | jb 0xfffffe8b // 33db | xor ebx, ebx // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 8b442458 | mov eax, dword ptr [esp + 0x58] // 50 | push eax $sequence_5 = { c3 57 e8???????? 83c404 3bc5 89432c } // n = 6, score = 100 // c3 | ret // 57 | push edi // e8???????? | // 83c404 | add esp, 4 // 3bc5 | cmp eax, ebp // 89432c | mov dword ptr [ebx + 0x2c], eax $sequence_6 = { 83f961 7208 83f97a 7703 83e957 c0e004 } // n = 6, score = 100 // 83f961 | cmp ecx, 0x61 // 7208 | jb 0xa // 83f97a | cmp ecx, 0x7a // 7703 | ja 5 // 83e957 | sub ecx, 0x57 // c0e004 | shl al, 4 $sequence_7 = { 8d8c249c000000 8894249c000000 e8???????? 8a442413 6a00 8d8c24ac000000 c68424d400000005 } // n = 7, score = 100 // 8d8c249c000000 | lea ecx, [esp + 0x9c] // 8894249c000000 | mov byte ptr [esp + 0x9c], dl // e8???????? | // 8a442413 | mov al, byte ptr [esp + 0x13] // 6a00 | push 0 // 8d8c24ac000000 | lea ecx, [esp + 0xac] // c68424d400000005 | mov byte ptr [esp + 0xd4], 5 $sequence_8 = { 8bfe 8b11 2bf8 03c5 57 50 } // n = 6, score = 100 // 8bfe | mov edi, esi // 8b11 | mov edx, dword ptr [ecx] // 2bf8 | sub edi, eax // 03c5 | add eax, ebp // 57 | push edi // 50 | push eax $sequence_9 = { 8b8424d8000000 33db 3bc3 899c24cc000000 7505 b8???????? 8b8c24dc000000 } // n = 7, score = 100 // 8b8424d8000000 | mov eax, dword ptr [esp + 0xd8] // 33db | xor ebx, ebx // 3bc3 | cmp eax, ebx // 899c24cc000000 | mov dword ptr [esp + 0xcc], ebx // 7505 | jne 7 // b8???????? | // 8b8c24dc000000 | mov ecx, dword ptr [esp + 0xdc] condition: 7 of them and filesize < 188416 }
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