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rule win_bughatch_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.bughatch." 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.bughatch" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 50 e8???????? 83c404 8945fc 68???????? ff15???????? } // n = 6, score = 100 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 8945fc | mov dword ptr [ebp - 4], eax // 68???????? | // ff15???????? | $sequence_1 = { 668b85bcfeffff 668902 8b4d08 668b95c0feffff 66895102 8b4508 8b8dc4feffff } // n = 7, score = 100 // 668b85bcfeffff | mov ax, word ptr [ebp - 0x144] // 668902 | mov word ptr [edx], ax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 668b95c0feffff | mov dx, word ptr [ebp - 0x140] // 66895102 | mov word ptr [ecx + 2], dx // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b8dc4feffff | mov ecx, dword ptr [ebp - 0x13c] $sequence_2 = { 8b45f4 50 e8???????? 83c404 8945f0 8b4df0 894dfc } // n = 7, score = 100 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 894dfc | mov dword ptr [ebp - 4], ecx $sequence_3 = { e8???????? 83c40c 8945e0 8b45e4 50 ff15???????? 8b4df8 } // n = 7, score = 100 // e8???????? | // 83c40c | add esp, 0xc // 8945e0 | mov dword ptr [ebp - 0x20], eax // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 50 | push eax // ff15???????? | // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_4 = { e8???????? 48 8b542428 48 8d4c2430 e8???????? 33c9 } // n = 7, score = 100 // e8???????? | // 48 | dec eax // 8b542428 | mov edx, dword ptr [esp + 0x28] // 48 | dec eax // 8d4c2430 | lea ecx, [esp + 0x30] // e8???????? | // 33c9 | xor ecx, ecx $sequence_5 = { 8945f8 6a00 8b4df4 51 8b55d8 52 8b45f8 } // n = 7, score = 100 // 8945f8 | mov dword ptr [ebp - 8], eax // 6a00 | push 0 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 51 | push ecx // 8b55d8 | mov edx, dword ptr [ebp - 0x28] // 52 | push edx // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_6 = { 51 8b55e4 52 ff15???????? 837d2400 7437 } // n = 6, score = 100 // 51 | push ecx // 8b55e4 | mov edx, dword ptr [ebp - 0x1c] // 52 | push edx // ff15???????? | // 837d2400 | cmp dword ptr [ebp + 0x24], 0 // 7437 | je 0x39 $sequence_7 = { 3d64860000 7404 33c0 eb73 4c } // n = 5, score = 100 // 3d64860000 | cmp eax, 0x8664 // 7404 | je 6 // 33c0 | xor eax, eax // eb73 | jmp 0x75 // 4c | dec esp $sequence_8 = { c705????????03000100 ff15???????? a3???????? 837d1400 7408 } // n = 5, score = 100 // c705????????03000100 | // ff15???????? | // a3???????? | // 837d1400 | cmp dword ptr [ebp + 0x14], 0 // 7408 | je 0xa $sequence_9 = { 6a00 8b4d0c 51 8b5508 52 8b45ec 50 } // n = 7, score = 100 // 6a00 | push 0 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 51 | push ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 50 | push eax condition: 7 of them and filesize < 75776 }
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