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rule win_zupdax_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.zupdax." 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.zupdax" 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 = { 52 8d442416 50 6689542418 e8???????? 83c418 } // n = 6, score = 300 // 52 | push edx // 8d442416 | lea eax, [esp + 0x16] // 50 | push eax // 6689542418 | mov word ptr [esp + 0x18], dx // e8???????? | // 83c418 | add esp, 0x18 $sequence_1 = { e8???????? 68c8000000 8d4e7c 6a00 51 e8???????? 83c418 } // n = 7, score = 300 // e8???????? | // 68c8000000 | push 0xc8 // 8d4e7c | lea ecx, [esi + 0x7c] // 6a00 | push 0 // 51 | push ecx // e8???????? | // 83c418 | add esp, 0x18 $sequence_2 = { 394c2414 765b 53 41 81e1ff000080 } // n = 5, score = 300 // 394c2414 | cmp dword ptr [esp + 0x14], ecx // 765b | jbe 0x5d // 53 | push ebx // 41 | inc ecx // 81e1ff000080 | and ecx, 0x800000ff $sequence_3 = { 51 8b4624 53 33db 57 } // n = 5, score = 300 // 51 | push ecx // 8b4624 | mov eax, dword ptr [esi + 0x24] // 53 | push ebx // 33db | xor ebx, ebx // 57 | push edi $sequence_4 = { 83c40c 6a00 8d4c2404 51 ff15???????? } // n = 5, score = 300 // 83c40c | add esp, 0xc // 6a00 | push 0 // 8d4c2404 | lea ecx, [esp + 4] // 51 | push ecx // ff15???????? | $sequence_5 = { 52 68???????? ff15???????? 8d442444 83c0fe 668b4802 83c002 } // n = 7, score = 300 // 52 | push edx // 68???????? | // ff15???????? | // 8d442444 | lea eax, [esp + 0x44] // 83c0fe | add eax, -2 // 668b4802 | mov cx, word ptr [eax + 2] // 83c002 | add eax, 2 $sequence_6 = { 46 8a1c06 881c01 881406 0fb61c01 } // n = 5, score = 300 // 46 | inc esi // 8a1c06 | mov bl, byte ptr [esi + eax] // 881c01 | mov byte ptr [ecx + eax], bl // 881406 | mov byte ptr [esi + eax], dl // 0fb61c01 | movzx ebx, byte ptr [ecx + eax] $sequence_7 = { 3b7c2418 72a7 5b 5f 5e } // n = 5, score = 300 // 3b7c2418 | cmp edi, dword ptr [esp + 0x18] // 72a7 | jb 0xffffffa9 // 5b | pop ebx // 5f | pop edi // 5e | pop esi $sequence_8 = { 8a1c06 881c01 881406 0fb61c01 0fb6d2 03da 81e3ff000080 } // n = 7, score = 300 // 8a1c06 | mov bl, byte ptr [esi + eax] // 881c01 | mov byte ptr [ecx + eax], bl // 881406 | mov byte ptr [esi + eax], dl // 0fb61c01 | movzx ebx, byte ptr [ecx + eax] // 0fb6d2 | movzx edx, dl // 03da | add ebx, edx // 81e3ff000080 | and ebx, 0x800000ff $sequence_9 = { 8b4624 53 33db 57 3bc3 7419 } // n = 6, score = 300 // 8b4624 | mov eax, dword ptr [esi + 0x24] // 53 | push ebx // 33db | xor ebx, ebx // 57 | push edi // 3bc3 | cmp eax, ebx // 7419 | je 0x1b condition: 7 of them and filesize < 1032192 }
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