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rule win_mykings_spreader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.mykings_spreader." 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.mykings_spreader" 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 = { 8b45e8 8b55a8 0355cc 8955e8 2b5598 e9???????? } // n = 6, score = 100 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 8b55a8 | mov edx, dword ptr [ebp - 0x58] // 0355cc | add edx, dword ptr [ebp - 0x34] // 8955e8 | mov dword ptr [ebp - 0x18], edx // 2b5598 | sub edx, dword ptr [ebp - 0x68] // e9???????? | $sequence_1 = { 85db 0f84c8020000 c745f001000000 8b4508 f7d0 8b7510 85f6 } // n = 7, score = 100 // 85db | test ebx, ebx // 0f84c8020000 | je 0x2ce // c745f001000000 | mov dword ptr [ebp - 0x10], 1 // 8b4508 | mov eax, dword ptr [ebp + 8] // f7d0 | not eax // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 85f6 | test esi, esi $sequence_2 = { 8b4304 8b8098000000 89430c 8b4304 899898000000 b8???????? e8???????? } // n = 7, score = 100 // 8b4304 | mov eax, dword ptr [ebx + 4] // 8b8098000000 | mov eax, dword ptr [eax + 0x98] // 89430c | mov dword ptr [ebx + 0xc], eax // 8b4304 | mov eax, dword ptr [ebx + 4] // 899898000000 | mov dword ptr [eax + 0x98], ebx // b8???????? | // e8???????? | $sequence_3 = { 39d1 72e8 8975cc 895dd0 897dc8 894dc4 } // n = 6, score = 100 // 39d1 | cmp ecx, edx // 72e8 | jb 0xffffffea // 8975cc | mov dword ptr [ebp - 0x34], esi // 895dd0 | mov dword ptr [ebp - 0x30], ebx // 897dc8 | mov dword ptr [ebp - 0x38], edi // 894dc4 | mov dword ptr [ebp - 0x3c], ecx $sequence_4 = { 0fb645f4 83f83a 7d06 8045f404 eb13 0fb645f4 83f82b } // n = 7, score = 100 // 0fb645f4 | movzx eax, byte ptr [ebp - 0xc] // 83f83a | cmp eax, 0x3a // 7d06 | jge 8 // 8045f404 | add byte ptr [ebp - 0xc], 4 // eb13 | jmp 0x15 // 0fb645f4 | movzx eax, byte ptr [ebp - 0xc] // 83f82b | cmp eax, 0x2b $sequence_5 = { 0f97857bffffff 8b4de8 83c105 394d84 0f97c1 088d7bffffff 8a8d7bffffff } // n = 7, score = 100 // 0f97857bffffff | seta byte ptr [ebp - 0x85] // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 83c105 | add ecx, 5 // 394d84 | cmp dword ptr [ebp - 0x7c], ecx // 0f97c1 | seta cl // 088d7bffffff | or byte ptr [ebp - 0x85], cl // 8a8d7bffffff | mov cl, byte ptr [ebp - 0x85] $sequence_6 = { 003f 5a 42 0008 5a 42 } // n = 6, score = 100 // 003f | add byte ptr [edi], bh // 5a | pop edx // 42 | inc edx // 0008 | add byte ptr [eax], cl // 5a | pop edx // 42 | inc edx $sequence_7 = { 88450b 8d3c8da02e4100 c1e603 8b0f 80650b48 88443104 7578 } // n = 7, score = 100 // 88450b | mov byte ptr [ebp + 0xb], al // 8d3c8da02e4100 | lea edi, [ecx*4 + 0x412ea0] // c1e603 | shl esi, 3 // 8b0f | mov ecx, dword ptr [edi] // 80650b48 | and byte ptr [ebp + 0xb], 0x48 // 88443104 | mov byte ptr [ecx + esi + 4], al // 7578 | jne 0x7a $sequence_8 = { 55 89e5 a1???????? 83f8ff 751e e8???????? a3???????? } // n = 7, score = 100 // 55 | push ebp // 89e5 | mov ebp, esp // a1???????? | // 83f8ff | cmp eax, -1 // 751e | jne 0x20 // e8???????? | // a3???????? | $sequence_9 = { 89bd64ffffff 8945fc 8955f8 894df4 8b75fc 8d7db4 fc } // n = 7, score = 100 // 89bd64ffffff | mov dword ptr [ebp - 0x9c], edi // 8945fc | mov dword ptr [ebp - 4], eax // 8955f8 | mov dword ptr [ebp - 8], edx // 894df4 | mov dword ptr [ebp - 0xc], ecx // 8b75fc | mov esi, dword ptr [ebp - 4] // 8d7db4 | lea edi, [ebp - 0x4c] // fc | cld condition: 7 of them and filesize < 1581056 }
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