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rule win_vermilion_strike_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 0f8e3f010000 56 55 8d442444 e8???????? 85ff 751b } // n = 7, score = 200 // 0f8e3f010000 | jle 0x145 // 56 | push esi // 55 | push ebp // 8d442444 | lea eax, [esp + 0x44] // e8???????? | // 85ff | test edi, edi // 751b | jne 0x1d $sequence_1 = { ff15???????? 8bf7 e8???????? 8b15???????? 6a00 6a01 } // n = 6, score = 200 // ff15???????? | // 8bf7 | mov esi, edi // e8???????? | // 8b15???????? | // 6a00 | push 0 // 6a01 | push 1 $sequence_2 = { 51 8d4601 e8???????? 6a30 53 8bc6 8d7c2444 } // n = 7, score = 200 // 51 | push ecx // 8d4601 | lea eax, [esi + 1] // e8???????? | // 6a30 | push 0x30 // 53 | push ebx // 8bc6 | mov eax, esi // 8d7c2444 | lea edi, [esp + 0x44] $sequence_3 = { 8bd8 8beb 897c2418 85c0 7517 e8???????? 33c0 } // n = 7, score = 200 // 8bd8 | mov ebx, eax // 8beb | mov ebp, ebx // 897c2418 | mov dword ptr [esp + 0x18], edi // 85c0 | test eax, eax // 7517 | jne 0x19 // e8???????? | // 33c0 | xor eax, eax $sequence_4 = { 6a00 6a00 6a03 6a00 6a00 50 53 } // n = 7, score = 200 // 6a00 | push 0 // 6a00 | push 0 // 6a03 | push 3 // 6a00 | push 0 // 6a00 | push 0 // 50 | push eax // 53 | push ebx $sequence_5 = { 83c8ff 8bf7 c744244802000000 e8???????? 885c2440 396c2428 720d } // n = 7, score = 200 // 83c8ff | or eax, 0xffffffff // 8bf7 | mov esi, edi // c744244802000000 | mov dword ptr [esp + 0x48], 2 // e8???????? | // 885c2440 | mov byte ptr [esp + 0x40], bl // 396c2428 | cmp dword ptr [esp + 0x28], ebp // 720d | jb 0xf $sequence_6 = { 83c004 395e18 7205 8b7604 eb03 83c604 8b3d???????? } // n = 7, score = 200 // 83c004 | add eax, 4 // 395e18 | cmp dword ptr [esi + 0x18], ebx // 7205 | jb 7 // 8b7604 | mov esi, dword ptr [esi + 4] // eb03 | jmp 5 // 83c604 | add esi, 4 // 8b3d???????? | $sequence_7 = { 8bc1 57 c746180f000000 c7461400000000 c744240400000000 c6460400 } // n = 6, score = 200 // 8bc1 | mov eax, ecx // 57 | push edi // c746180f000000 | mov dword ptr [esi + 0x18], 0xf // c7461400000000 | mov dword ptr [esi + 0x14], 0 // c744240400000000 | mov dword ptr [esp + 4], 0 // c6460400 | mov byte ptr [esi + 4], 0 $sequence_8 = { 6a02 8bc3 7413 68???????? e8???????? 6a02 68???????? } // n = 7, score = 200 // 6a02 | push 2 // 8bc3 | mov eax, ebx // 7413 | je 0x15 // 68???????? | // e8???????? | // 6a02 | push 2 // 68???????? | $sequence_9 = { 3bc5 7405 e8???????? 2bdf 8b542424 52 } // n = 6, score = 200 // 3bc5 | cmp eax, ebp // 7405 | je 7 // e8???????? | // 2bdf | sub ebx, edi // 8b542424 | mov edx, dword ptr [esp + 0x24] // 52 | push edx condition: 7 of them and filesize < 540672 }
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