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rule win_remy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.remy." 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.remy" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 6899010000 8d542460 52 33db 8d442430 899c2418020000 } // n = 6, score = 200 // 6899010000 | push 0x199 // 8d542460 | lea edx, [esp + 0x60] // 52 | push edx // 33db | xor ebx, ebx // 8d442430 | lea eax, [esp + 0x30] // 899c2418020000 | mov dword ptr [esp + 0x218], ebx $sequence_1 = { 8d5e0c 7c34 8b10 3b16 752e e8???????? 8945fc } // n = 7, score = 200 // 8d5e0c | lea ebx, [esi + 0xc] // 7c34 | jl 0x36 // 8b10 | mov edx, dword ptr [eax] // 3b16 | cmp edx, dword ptr [esi] // 752e | jne 0x30 // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax $sequence_2 = { c745d84b47f9fb 885ddc 8d4dd4 800127 41 3819 } // n = 6, score = 200 // c745d84b47f9fb | mov dword ptr [ebp - 0x28], 0xfbf9474b // 885ddc | mov byte ptr [ebp - 0x24], bl // 8d4dd4 | lea ecx, [ebp - 0x2c] // 800127 | add byte ptr [ecx], 0x27 // 41 | inc ecx // 3819 | cmp byte ptr [ecx], bl $sequence_3 = { ff15???????? 85c0 750b ff15???????? 8b4d10 8901 57 } // n = 7, score = 200 // ff15???????? | // 85c0 | test eax, eax // 750b | jne 0xd // ff15???????? | // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 8901 | mov dword ptr [ecx], eax // 57 | push edi $sequence_4 = { c745fcffffffff 8b7b10 2b7de8 8d459c 57 8bcb e8???????? } // n = 7, score = 200 // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // 8b7b10 | mov edi, dword ptr [ebx + 0x10] // 2b7de8 | sub edi, dword ptr [ebp - 0x18] // 8d459c | lea eax, [ebp - 0x64] // 57 | push edi // 8bcb | mov ecx, ebx // e8???????? | $sequence_5 = { 2bc1 8902 8d4c3134 898e38100000 895de4 68???????? } // n = 6, score = 200 // 2bc1 | sub eax, ecx // 8902 | mov dword ptr [edx], eax // 8d4c3134 | lea ecx, [ecx + esi + 0x34] // 898e38100000 | mov dword ptr [esi + 0x1038], ecx // 895de4 | mov dword ptr [ebp - 0x1c], ebx // 68???????? | $sequence_6 = { e8???????? c645fc01 8b06 50 e8???????? 33db } // n = 6, score = 200 // e8???????? | // c645fc01 | mov byte ptr [ebp - 4], 1 // 8b06 | mov eax, dword ptr [esi] // 50 | push eax // e8???????? | // 33db | xor ebx, ebx $sequence_7 = { 8b4c241c 50 51 ff15???????? 85c0 7e08 2bf8 } // n = 7, score = 200 // 8b4c241c | mov ecx, dword ptr [esp + 0x1c] // 50 | push eax // 51 | push ecx // ff15???????? | // 85c0 | test eax, eax // 7e08 | jle 0xa // 2bf8 | sub edi, eax $sequence_8 = { e8???????? c68424d002000001 8b542420 8b7c2430 56 52 8d842480000000 } // n = 7, score = 200 // e8???????? | // c68424d002000001 | mov byte ptr [esp + 0x2d0], 1 // 8b542420 | mov edx, dword ptr [esp + 0x20] // 8b7c2430 | mov edi, dword ptr [esp + 0x30] // 56 | push esi // 52 | push edx // 8d842480000000 | lea eax, [esp + 0x80] $sequence_9 = { ffd3 8d4dd4 51 56 8bf8 ffd3 8d55bc } // n = 7, score = 200 // ffd3 | call ebx // 8d4dd4 | lea ecx, [ebp - 0x2c] // 51 | push ecx // 56 | push esi // 8bf8 | mov edi, eax // ffd3 | call ebx // 8d55bc | lea edx, [ebp - 0x44] condition: 7 of them and filesize < 507904 }
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