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rule win_confucius_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.confucius" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 33d2 2b4508 f7750c ebe5 53 56 } // n = 6, score = 100 // 33d2 | xor edx, edx // 2b4508 | sub eax, dword ptr [ebp + 8] // f7750c | div dword ptr [ebp + 0xc] // ebe5 | jmp 0xffffffe7 // 53 | push ebx // 56 | push esi $sequence_1 = { 395d10 7409 ff7510 ff15???????? 385d0f 0f8493fcffff 6882000000 } // n = 7, score = 100 // 395d10 | cmp dword ptr [ebp + 0x10], ebx // 7409 | je 0xb // ff7510 | push dword ptr [ebp + 0x10] // ff15???????? | // 385d0f | cmp byte ptr [ebp + 0xf], bl // 0f8493fcffff | je 0xfffffc99 // 6882000000 | push 0x82 $sequence_2 = { e8???????? 0fb7c0 8945fc 8d460a 50 e8???????? 837dfc01 } // n = 7, score = 100 // e8???????? | // 0fb7c0 | movzx eax, ax // 8945fc | mov dword ptr [ebp - 4], eax // 8d460a | lea eax, [esi + 0xa] // 50 | push eax // e8???????? | // 837dfc01 | cmp dword ptr [ebp - 4], 1 $sequence_3 = { 59 59 85db 7506 43 eb03 8b5d70 } // n = 7, score = 100 // 59 | pop ecx // 59 | pop ecx // 85db | test ebx, ebx // 7506 | jne 8 // 43 | inc ebx // eb03 | jmp 5 // 8b5d70 | mov ebx, dword ptr [ebp + 0x70] $sequence_4 = { 6a00 83c038 50 e8???????? a1???????? 8d4838 51 } // n = 7, score = 100 // 6a00 | push 0 // 83c038 | add eax, 0x38 // 50 | push eax // e8???????? | // a1???????? | // 8d4838 | lea ecx, [eax + 0x38] // 51 | push ecx $sequence_5 = { 51 895d00 e8???????? 8d540601 83c408 } // n = 5, score = 100 // 51 | push ecx // 895d00 | mov dword ptr [ebp], ebx // e8???????? | // 8d540601 | lea edx, [esi + eax + 1] // 83c408 | add esp, 8 $sequence_6 = { ebc6 57 e8???????? 83c404 8bf0 8bc6 5f } // n = 7, score = 100 // ebc6 | jmp 0xffffffc8 // 57 | push edi // e8???????? | // 83c404 | add esp, 4 // 8bf0 | mov esi, eax // 8bc6 | mov eax, esi // 5f | pop edi $sequence_7 = { 84c0 0f84a8030000 8b85d0010000 85c0 743b 8b9564850000 } // n = 6, score = 100 // 84c0 | test al, al // 0f84a8030000 | je 0x3ae // 8b85d0010000 | mov eax, dword ptr [ebp + 0x1d0] // 85c0 | test eax, eax // 743b | je 0x3d // 8b9564850000 | mov edx, dword ptr [ebp + 0x8564] $sequence_8 = { 0f82effdffff 8b442418 c6451000 5f 5e } // n = 5, score = 100 // 0f82effdffff | jb 0xfffffdf5 // 8b442418 | mov eax, dword ptr [esp + 0x18] // c6451000 | mov byte ptr [ebp + 0x10], 0 // 5f | pop edi // 5e | pop esi $sequence_9 = { 84c0 898e04010000 744b 8a8654030000 84c0 7410 } // n = 6, score = 100 // 84c0 | test al, al // 898e04010000 | mov dword ptr [esi + 0x104], ecx // 744b | je 0x4d // 8a8654030000 | mov al, byte ptr [esi + 0x354] // 84c0 | test al, al // 7410 | je 0x12 $sequence_10 = { 837c242000 0f8550ffffff 837c241800 8b6c2414 0f8487fcffff } // n = 5, score = 100 // 837c242000 | cmp dword ptr [esp + 0x20], 0 // 0f8550ffffff | jne 0xffffff56 // 837c241800 | cmp dword ptr [esp + 0x18], 0 // 8b6c2414 | mov ebp, dword ptr [esp + 0x14] // 0f8487fcffff | je 0xfffffc8d $sequence_11 = { 0f84dc010000 8b8c244c080000 8b39 85ff 0f84e9010000 8b5718 8b5f0c } // n = 7, score = 100 // 0f84dc010000 | je 0x1e2 // 8b8c244c080000 | mov ecx, dword ptr [esp + 0x84c] // 8b39 | mov edi, dword ptr [ecx] // 85ff | test edi, edi // 0f84e9010000 | je 0x1ef // 8b5718 | mov edx, dword ptr [edi + 0x18] // 8b5f0c | mov ebx, dword ptr [edi + 0xc] $sequence_12 = { 6a00 8d8528a7ffff 50 8d8dc8bbffff e8???????? } // n = 5, score = 100 // 6a00 | push 0 // 8d8528a7ffff | lea eax, [ebp - 0x58d8] // 50 | push eax // 8d8dc8bbffff | lea ecx, [ebp - 0x4438] // e8???????? | $sequence_13 = { 8325????????00 2bce 1b3d???????? 890d???????? } // n = 4, score = 100 // 8325????????00 | // 2bce | sub ecx, esi // 1b3d???????? | // 890d???????? | $sequence_14 = { 55 e8???????? 83c418 85c0 7506 397c2418 741a } // n = 7, score = 100 // 55 | push ebp // e8???????? | // 83c418 | add esp, 0x18 // 85c0 | test eax, eax // 7506 | jne 8 // 397c2418 | cmp dword ptr [esp + 0x18], edi // 741a | je 0x1c $sequence_15 = { e8???????? 84c0 7571 eb15 3ac3 7411 } // n = 6, score = 100 // e8???????? | // 84c0 | test al, al // 7571 | jne 0x73 // eb15 | jmp 0x17 // 3ac3 | cmp al, bl // 7411 | je 0x13 condition: 7 of them and filesize < 598016 }
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