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rule win_ziyangrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.ziyangrat." 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.ziyangrat" 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 = { c684243901000072 c684243c01000064 c684243d01000020 c684243e0100004d c684243f01000069 } // n = 5, score = 200 // c684243901000072 | mov byte ptr [esp + 0x139], 0x72 // c684243c01000064 | mov byte ptr [esp + 0x13c], 0x64 // c684243d01000020 | mov byte ptr [esp + 0x13d], 0x20 // c684243e0100004d | mov byte ptr [esp + 0x13e], 0x4d // c684243f01000069 | mov byte ptr [esp + 0x13f], 0x69 $sequence_1 = { 85c0 742b 8b4c2418 68???????? 51 } // n = 5, score = 200 // 85c0 | test eax, eax // 742b | je 0x2d // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] // 68???????? | // 51 | push ecx $sequence_2 = { 889c2440010000 b265 f3ab 66ab aa 33c0 33c9 } // n = 7, score = 200 // 889c2440010000 | mov byte ptr [esp + 0x140], bl // b265 | mov dl, 0x65 // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // 33c0 | xor eax, eax // 33c9 | xor ecx, ecx $sequence_3 = { 8b4c2444 8d442450 81e2ffff0000 50 8b442420 51 8b4c2422 } // n = 7, score = 200 // 8b4c2444 | mov ecx, dword ptr [esp + 0x44] // 8d442450 | lea eax, [esp + 0x50] // 81e2ffff0000 | and edx, 0xffff // 50 | push eax // 8b442420 | mov eax, dword ptr [esp + 0x20] // 51 | push ecx // 8b4c2422 | mov ecx, dword ptr [esp + 0x22] $sequence_4 = { c644243749 c644243853 c64424394b 885c243a } // n = 4, score = 200 // c644243749 | mov byte ptr [esp + 0x37], 0x49 // c644243853 | mov byte ptr [esp + 0x38], 0x53 // c64424394b | mov byte ptr [esp + 0x39], 0x4b // 885c243a | mov byte ptr [esp + 0x3a], bl $sequence_5 = { f3ab 8d5c242c 8bac2484050000 c744242811000000 b980000000 33c0 } // n = 6, score = 200 // f3ab | rep stosd dword ptr es:[edi], eax // 8d5c242c | lea ebx, [esp + 0x2c] // 8bac2484050000 | mov ebp, dword ptr [esp + 0x584] // c744242811000000 | mov dword ptr [esp + 0x28], 0x11 // b980000000 | mov ecx, 0x80 // 33c0 | xor eax, eax $sequence_6 = { ffd3 85c0 742b 8b4c2418 68???????? 51 56 } // n = 7, score = 200 // ffd3 | call ebx // 85c0 | test eax, eax // 742b | je 0x2d // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] // 68???????? | // 51 | push ecx // 56 | push esi $sequence_7 = { 888c240b010000 898c2413010000 898c2417010000 33c0 888c241b010000 } // n = 5, score = 200 // 888c240b010000 | mov byte ptr [esp + 0x10b], cl // 898c2413010000 | mov dword ptr [esp + 0x113], ecx // 898c2417010000 | mov dword ptr [esp + 0x117], ecx // 33c0 | xor eax, eax // 888c241b010000 | mov byte ptr [esp + 0x11b], cl $sequence_8 = { e8???????? 68e8030000 ff15???????? 33c0 83c420 c3 } // n = 6, score = 200 // e8???????? | // 68e8030000 | push 0x3e8 // ff15???????? | // 33c0 | xor eax, eax // 83c420 | add esp, 0x20 // c3 | ret $sequence_9 = { e8???????? 83c410 83c640 4f 75e5 } // n = 5, score = 200 // e8???????? | // 83c410 | add esp, 0x10 // 83c640 | add esi, 0x40 // 4f | dec edi // 75e5 | jne 0xffffffe7 condition: 7 of them and filesize < 188416 }
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