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rule win_gpcode_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.gpcode" 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 = { e8???????? a1???????? a3???????? 6800001000 68???????? ff35???????? } // n = 6, score = 1400 // e8???????? | // a1???????? | // a3???????? | // 6800001000 | push 0x100000 // 68???????? | // ff35???????? | $sequence_1 = { e8???????? e8???????? c705????????01000000 c3 55 } // n = 5, score = 1400 // e8???????? | // e8???????? | // c705????????01000000 | // c3 | ret // 55 | push ebp $sequence_2 = { 68???????? e8???????? 91 6a00 } // n = 4, score = 1400 // 68???????? | // e8???????? | // 91 | xchg eax, ecx // 6a00 | push 0 $sequence_3 = { 51 56 8b0d???????? 49 } // n = 4, score = 1100 // 51 | push ecx // 56 | push esi // 8b0d???????? | // 49 | dec ecx $sequence_4 = { 6a03 50 50 6a50 ff35???????? ff75fc ff15???????? } // n = 7, score = 1100 // 6a03 | push 3 // 50 | push eax // 50 | push eax // 6a50 | push 0x50 // ff35???????? | // ff75fc | push dword ptr [ebp - 4] // ff15???????? | $sequence_5 = { e8???????? 68???????? e8???????? 33d2 b940000000 } // n = 5, score = 1100 // e8???????? | // 68???????? | // e8???????? | // 33d2 | xor edx, edx // b940000000 | mov ecx, 0x40 $sequence_6 = { c70000000000 51 68???????? 8d450c ff30 e8???????? 0fb603 } // n = 7, score = 1100 // c70000000000 | mov dword ptr [eax], 0 // 51 | push ecx // 68???????? | // 8d450c | lea eax, [ebp + 0xc] // ff30 | push dword ptr [eax] // e8???????? | // 0fb603 | movzx eax, byte ptr [ebx] $sequence_7 = { e8???????? 6a02 68???????? 6a00 e8???????? 0bc0 } // n = 6, score = 800 // e8???????? | // 6a02 | push 2 // 68???????? | // 6a00 | push 0 // e8???????? | // 0bc0 | or eax, eax $sequence_8 = { 55 8bec 83c4ec 6800050000 } // n = 4, score = 800 // 55 | push ebp // 8bec | mov ebp, esp // 83c4ec | add esp, -0x14 // 6800050000 | push 0x500 $sequence_9 = { c780????????5c2a0000 e8???????? 58 c780????????5c2a0000 } // n = 4, score = 800 // c780????????5c2a0000 | // e8???????? | // 58 | pop eax // c780????????5c2a0000 | $sequence_10 = { 68???????? e8???????? 83f8ff 7505 } // n = 4, score = 800 // 68???????? | // e8???????? | // 83f8ff | cmp eax, -1 // 7505 | jne 7 $sequence_11 = { 69c0fd430300 2b4c2404 05c39e2600 a3???????? } // n = 4, score = 100 // 69c0fd430300 | imul eax, eax, 0x343fd // 2b4c2404 | sub ecx, dword ptr [esp + 4] // 05c39e2600 | add eax, 0x269ec3 // a3???????? | $sequence_12 = { 8944242c ff15???????? 4f 3bfb 8be8 8bf5 895c2410 } // n = 7, score = 100 // 8944242c | mov dword ptr [esp + 0x2c], eax // ff15???????? | // 4f | dec edi // 3bfb | cmp edi, ebx // 8be8 | mov ebp, eax // 8bf5 | mov esi, ebp // 895c2410 | mov dword ptr [esp + 0x10], ebx $sequence_13 = { 8b442404 e8???????? 85c0 7437 53 56 } // n = 6, score = 100 // 8b442404 | mov eax, dword ptr [esp + 4] // e8???????? | // 85c0 | test eax, eax // 7437 | je 0x39 // 53 | push ebx // 56 | push esi $sequence_14 = { 884b01 8bf8 8b45dc 83c303 8a0f 80f912 7532 } // n = 7, score = 100 // 884b01 | mov byte ptr [ebx + 1], cl // 8bf8 | mov edi, eax // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 83c303 | add ebx, 3 // 8a0f | mov cl, byte ptr [edi] // 80f912 | cmp cl, 0x12 // 7532 | jne 0x34 $sequence_15 = { 57 e8???????? 83c40c 3b4510 } // n = 4, score = 100 // 57 | push edi // e8???????? | // 83c40c | add esp, 0xc // 3b4510 | cmp eax, dword ptr [ebp + 0x10] $sequence_16 = { 57 8d7001 50 56 e8???????? 8a45dc 8b4df4 } // n = 7, score = 100 // 57 | push edi // 8d7001 | lea esi, [eax + 1] // 50 | push eax // 56 | push esi // e8???????? | // 8a45dc | mov al, byte ptr [ebp - 0x24] // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_17 = { 40 39454c 894558 7c42 3b5e28 0f83f00d0000 } // n = 6, score = 100 // 40 | inc eax // 39454c | cmp dword ptr [ebp + 0x4c], eax // 894558 | mov dword ptr [ebp + 0x58], eax // 7c42 | jl 0x44 // 3b5e28 | cmp ebx, dword ptr [esi + 0x28] // 0f83f00d0000 | jae 0xdf6 $sequence_18 = { ff4dfc 837df000 7e04 8345fc04 33c9 85c0 } // n = 6, score = 100 // ff4dfc | dec dword ptr [ebp - 4] // 837df000 | cmp dword ptr [ebp - 0x10], 0 // 7e04 | jle 6 // 8345fc04 | add dword ptr [ebp - 4], 4 // 33c9 | xor ecx, ecx // 85c0 | test eax, eax condition: 7 of them and filesize < 761856 }
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