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rule win_nokoyawa_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.nokoyawa." 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.nokoyawa" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { c744243065000000 c744243478000000 c744243870000000 c744243c61000000 c74424406e000000 c744244464000000 c744244820000000 } // n = 7, score = 100 // c744243065000000 | sub esp, 0x38 // c744243478000000 | dec eax // c744243870000000 | mov eax, dword ptr [esp + 0x40] // c744243c61000000 | movzx eax, word ptr [eax] // c74424406e000000 | mov ecx, eax // c744244464000000 | mov dword ptr [esp + 0x24], eax // c744244820000000 | dec eax $sequence_1 = { eb08 8b0424 ffc0 890424 833c2408 7d1b 48630424 } // n = 7, score = 100 // eb08 | mov dword ptr [esp + 8], ecx // 8b0424 | dec eax // ffc0 | sub esp, 0x38 // 890424 | dec eax // 833c2408 | mov ecx, dword ptr [esp + 0x40] // 7d1b | test eax, eax // 48630424 | je 0x51 $sequence_2 = { 7598 8b44240c c1e005 8b4c240c c1e91b 0bc1 8b4c2404 } // n = 7, score = 100 // 7598 | mov eax, dword ptr [ecx + eax + 0x14] // 8b44240c | dec eax // c1e005 | add eax, dword ptr [esp + 0x1b8] // 8b4c240c | mov ecx, 4 // c1e91b | mov eax, 4 // 0bc1 | dec eax // 8b4c2404 | imul eax, eax, 0 $sequence_3 = { 89842480010000 b804000000 486bc00e 8b8c2480010000 } // n = 4, score = 100 // 89842480010000 | lea ecx, [esp + 0x20] // b804000000 | dec esp // 486bc00e | mov eax, dword ptr [esp + 0x78] // 8b8c2480010000 | dec eax $sequence_4 = { 488bd0 488d4c245c e8???????? 3d26b4807c 7440 488d4c245c e8???????? } // n = 7, score = 100 // 488bd0 | dec eax // 488d4c245c | mov edx, dword ptr [esp + 0x50] // e8???????? | // 3d26b4807c | dec esp // 7440 | mov eax, dword ptr [esp + 0x48] // 488d4c245c | inc ecx // e8???????? | $sequence_5 = { e8???????? 4889442440 41b878020000 33d2 488b4c2440 e8???????? } // n = 6, score = 100 // e8???????? | // 4889442440 | dec eax // 41b878020000 | mov ecx, dword ptr [eax + 0x50] // 33d2 | dec eax // 488b4c2440 | mov eax, dword ptr [esp + 0x30] // e8???????? | $sequence_6 = { 0fb70441 83f82f 7414 488d155b640000 488d8c24b0080000 e8???????? } // n = 6, score = 100 // 0fb70441 | dec eax // 83f82f | imul eax, eax, 1 // 7414 | dec eax // 488d155b640000 | mov ecx, dword ptr [esp + 0x40] // 488d8c24b0080000 | mov eax, dword ptr [ecx + eax + 0x14] // e8???????? | $sequence_7 = { 0bd1 8bca 8b9424b0000000 03d1 8bca 8d8408a1ebd96e 8b4c2404 } // n = 7, score = 100 // 0bd1 | mov ecx, 2 // 8bca | dec eax // 8b9424b0000000 | lea eax, [esp + eax*4 + 0x28] // 03d1 | dec eax // 8bca | arpl word ptr [esp + 0x24], cx // 8d8408a1ebd96e | mov edx, dword ptr [esp + 0x24] // 8b4c2404 | inc esp $sequence_8 = { 33d2 8b442410 b920000000 f7f1 8bc0 } // n = 5, score = 100 // 33d2 | dec esp // 8b442410 | mov eax, dword ptr [esp + 0x50] // b920000000 | dec esp // f7f1 | add eax, edx // 8bc0 | mov edx, 4 $sequence_9 = { 0bd1 8bca 8b9424c4000000 03d1 8bca 8d8408a1ebd96e 8b4c2404 } // n = 7, score = 100 // 0bd1 | lea ecx, [esp + 0x20] // 8bca | dec eax // 8b9424c4000000 | mov edx, dword ptr [esp + 0x58] // 03d1 | dec eax // 8bca | mov ecx, dword ptr [esp + 0x50] // 8d8408a1ebd96e | dec eax // 8b4c2404 | lea edx, [esp + 0x20] condition: 7 of them and filesize < 92160 }
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