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rule win_unidentified_013_korean_malware_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 3bd7 7cf5 7f04 3bc5 72ef } // n = 5, score = 200 // 3bd7 | cmp edx, edi // 7cf5 | jl 0xfffffff7 // 7f04 | jg 6 // 3bc5 | cmp eax, ebp // 72ef | jb 0xfffffff1 $sequence_1 = { 57 a1???????? 33c4 50 8d842458060000 64a300000000 68???????? } // n = 7, score = 200 // 57 | push edi // a1???????? | // 33c4 | xor eax, esp // 50 | push eax // 8d842458060000 | lea eax, [esp + 0x658] // 64a300000000 | mov dword ptr fs:[0], eax // 68???????? | $sequence_2 = { 6800040000 8d4c241c 51 57 ffd5 85c0 743f } // n = 7, score = 200 // 6800040000 | push 0x400 // 8d4c241c | lea ecx, [esp + 0x1c] // 51 | push ecx // 57 | push edi // ffd5 | call ebp // 85c0 | test eax, eax // 743f | je 0x41 $sequence_3 = { 81c40c040000 c3 8b2d???????? 8d44240c 50 } // n = 5, score = 200 // 81c40c040000 | add esp, 0x40c // c3 | ret // 8b2d???????? | // 8d44240c | lea eax, [esp + 0xc] // 50 | push eax $sequence_4 = { e8???????? 83c424 8bd8 8d542414 8d8c2454030000 } // n = 5, score = 200 // e8???????? | // 83c424 | add esp, 0x24 // 8bd8 | mov ebx, eax // 8d542414 | lea edx, [esp + 0x14] // 8d8c2454030000 | lea ecx, [esp + 0x354] $sequence_5 = { 8b44243c ff4c241c 3bf8 7605 e8???????? 8b44242c bb10000000 } // n = 7, score = 200 // 8b44243c | mov eax, dword ptr [esp + 0x3c] // ff4c241c | dec dword ptr [esp + 0x1c] // 3bf8 | cmp edi, eax // 7605 | jbe 7 // e8???????? | // 8b44242c | mov eax, dword ptr [esp + 0x2c] // bb10000000 | mov ebx, 0x10 $sequence_6 = { 83c428 c3 3c03 0f8558ffffff 83f901 } // n = 5, score = 200 // 83c428 | add esp, 0x28 // c3 | ret // 3c03 | cmp al, 3 // 0f8558ffffff | jne 0xffffff5e // 83f901 | cmp ecx, 1 $sequence_7 = { 8d442414 50 c744242003000000 ff15???????? b902000000 } // n = 5, score = 200 // 8d442414 | lea eax, [esp + 0x14] // 50 | push eax // c744242003000000 | mov dword ptr [esp + 0x20], 3 // ff15???????? | // b902000000 | mov ecx, 2 $sequence_8 = { 68???????? 68???????? e8???????? 83c410 e8???????? b230 } // n = 6, score = 200 // 68???????? | // 68???????? | // e8???????? | // 83c410 | add esp, 0x10 // e8???????? | // b230 | mov dl, 0x30 $sequence_9 = { 6a00 6a00 6a00 8bf2 6a00 6a00 8bf9 } // n = 7, score = 200 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 8bf2 | mov esi, edx // 6a00 | push 0 // 6a00 | push 0 // 8bf9 | mov edi, ecx condition: 7 of them and filesize < 204800 }
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