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rule win_vermilion_strike_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.vermilion_strike." 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.vermilion_strike" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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???????? 56 e8???????? 83c404 837c243410 720d 8b442420 } // n = 7, score = 200 // e8???????? | // 56 | push esi // e8???????? | // 83c404 | add esp, 4 // 837c243410 | cmp dword ptr [esp + 0x34], 0x10 // 720d | jb 0xf // 8b442420 | mov eax, dword ptr [esp + 0x20] $sequence_1 = { c744241400000000 8b4648 2409 3c01 751f 8b4650 85c0 } // n = 7, score = 200 // c744241400000000 | mov dword ptr [esp + 0x14], 0 // 8b4648 | mov eax, dword ptr [esi + 0x48] // 2409 | and al, 9 // 3c01 | cmp al, 1 // 751f | jne 0x21 // 8b4650 | mov eax, dword ptr [esi + 0x50] // 85c0 | test eax, eax $sequence_2 = { 68???????? 64a100000000 50 b88c100000 e8???????? a1???????? 33c4 } // n = 7, score = 200 // 68???????? | // 64a100000000 | mov eax, dword ptr fs:[0] // 50 | push eax // b88c100000 | mov eax, 0x108c // e8???????? | // a1???????? | // 33c4 | xor eax, esp $sequence_3 = { 88642428 88442429 a1???????? b15a 884c2421 884c2425 8bc8 } // n = 7, score = 200 // 88642428 | mov byte ptr [esp + 0x28], ah // 88442429 | mov byte ptr [esp + 0x29], al // a1???????? | // b15a | mov cl, 0x5a // 884c2421 | mov byte ptr [esp + 0x21], cl // 884c2425 | mov byte ptr [esp + 0x25], cl // 8bc8 | mov ecx, eax $sequence_4 = { 33c0 bf07000000 897e18 895e14 6aff 66894604 53 } // n = 7, score = 200 // 33c0 | xor eax, eax // bf07000000 | mov edi, 7 // 897e18 | mov dword ptr [esi + 0x18], edi // 895e14 | mov dword ptr [esi + 0x14], ebx // 6aff | push -1 // 66894604 | mov word ptr [esi + 4], ax // 53 | push ebx $sequence_5 = { 6a00 68???????? ff15???????? 85c0 7505 5d 83c40c } // n = 7, score = 200 // 6a00 | push 0 // 68???????? | // ff15???????? | // 85c0 | test eax, eax // 7505 | jne 7 // 5d | pop ebp // 83c40c | add esp, 0xc $sequence_6 = { 50 8d4c2418 895c240c 51 89742418 c744241404010000 ff15???????? } // n = 7, score = 200 // 50 | push eax // 8d4c2418 | lea ecx, [esp + 0x18] // 895c240c | mov dword ptr [esp + 0xc], ebx // 51 | push ecx // 89742418 | mov dword ptr [esp + 0x18], esi // c744241404010000 | mov dword ptr [esp + 0x14], 0x104 // ff15???????? | $sequence_7 = { 8b0b 894c2420 eb04 895c2420 83f808 7204 8b0b } // n = 7, score = 200 // 8b0b | mov ecx, dword ptr [ebx] // 894c2420 | mov dword ptr [esp + 0x20], ecx // eb04 | jmp 6 // 895c2420 | mov dword ptr [esp + 0x20], ebx // 83f808 | cmp eax, 8 // 7204 | jb 6 // 8b0b | mov ecx, dword ptr [ebx] $sequence_8 = { 720d 8b44241c 50 e8???????? 83c404 89742430 895c242c } // n = 7, score = 200 // 720d | jb 0xf // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 89742430 | mov dword ptr [esp + 0x30], esi // 895c242c | mov dword ptr [esp + 0x2c], ebx $sequence_9 = { 8b15???????? 68???????? 6800010000 6a00 } // n = 4, score = 200 // 8b15???????? | // 68???????? | // 6800010000 | push 0x100 // 6a00 | push 0 condition: 7 of them and filesize < 540672 }
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