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rule win_unidentified_013_korean_malware_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.unidentified_013_korean_malware." 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.unidentified_013_korean_malware" 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 = { 83c404 85c0 750e 80fb28 } // n = 4, score = 200 // 83c404 | add esp, 4 // 85c0 | test eax, eax // 750e | jne 0x10 // 80fb28 | cmp bl, 0x28 $sequence_1 = { 84c9 75f9 2bc2 8d6801 8d4501 3944241c 761a } // n = 7, score = 200 // 84c9 | test cl, cl // 75f9 | jne 0xfffffffb // 2bc2 | sub eax, edx // 8d6801 | lea ebp, [eax + 1] // 8d4501 | lea eax, [ebp + 1] // 3944241c | cmp dword ptr [esp + 0x1c], eax // 761a | jbe 0x1c $sequence_2 = { 6a00 ff15???????? 837c243410 720d 8b542420 52 } // n = 6, score = 200 // 6a00 | push 0 // ff15???????? | // 837c243410 | cmp dword ptr [esp + 0x34], 0x10 // 720d | jb 0xf // 8b542420 | mov edx, dword ptr [esp + 0x20] // 52 | push edx $sequence_3 = { 8d9c2454010000 8d8c2454050000 897c2414 897c2418 } // n = 4, score = 200 // 8d9c2454010000 | lea ebx, [esp + 0x154] // 8d8c2454050000 | lea ecx, [esp + 0x554] // 897c2414 | mov dword ptr [esp + 0x14], edi // 897c2418 | mov dword ptr [esp + 0x18], edi $sequence_4 = { 8944240c eb08 c744240cf2030000 8b4c241c 51 ff15???????? 397c240c } // n = 7, score = 200 // 8944240c | mov dword ptr [esp + 0xc], eax // eb08 | jmp 0xa // c744240cf2030000 | mov dword ptr [esp + 0xc], 0x3f2 // 8b4c241c | mov ecx, dword ptr [esp + 0x1c] // 51 | push ecx // ff15???????? | // 397c240c | cmp dword ptr [esp + 0xc], edi $sequence_5 = { 8b7c2418 8b6c2414 8908 8b0d???????? 895004 8b15???????? } // n = 6, score = 200 // 8b7c2418 | mov edi, dword ptr [esp + 0x18] // 8b6c2414 | mov ebp, dword ptr [esp + 0x14] // 8908 | mov dword ptr [eax], ecx // 8b0d???????? | // 895004 | mov dword ptr [eax + 4], edx // 8b15???????? | $sequence_6 = { 0fb6442e04 3bc1 7412 0fb6542e05 3bd1 7409 0fb6442e06 } // n = 7, score = 200 // 0fb6442e04 | movzx eax, byte ptr [esi + ebp + 4] // 3bc1 | cmp eax, ecx // 7412 | je 0x14 // 0fb6542e05 | movzx edx, byte ptr [esi + ebp + 5] // 3bd1 | cmp edx, ecx // 7409 | je 0xb // 0fb6442e06 | movzx eax, byte ptr [esi + ebp + 6] $sequence_7 = { 68e8030000 ffd6 83ef01 75f4 e8???????? } // n = 5, score = 200 // 68e8030000 | push 0x3e8 // ffd6 | call esi // 83ef01 | sub edi, 1 // 75f4 | jne 0xfffffff6 // e8???????? | $sequence_8 = { 8d542414 8bde 8d8c2454040000 e8???????? 85c0 0f84fd000000 } // n = 6, score = 200 // 8d542414 | lea edx, [esp + 0x14] // 8bde | mov ebx, esi // 8d8c2454040000 | lea ecx, [esp + 0x454] // e8???????? | // 85c0 | test eax, eax // 0f84fd000000 | je 0x103 $sequence_9 = { 3bd8 0f8307010000 0fb6543301 8beb b901000000 896c2430 03da } // n = 7, score = 200 // 3bd8 | cmp ebx, eax // 0f8307010000 | jae 0x10d // 0fb6543301 | movzx edx, byte ptr [ebx + esi + 1] // 8beb | mov ebp, ebx // b901000000 | mov ecx, 1 // 896c2430 | mov dword ptr [esp + 0x30], ebp // 03da | add ebx, edx condition: 7 of them and filesize < 204800 }
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