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rule win_lodeinfo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.lodeinfo." 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.lodeinfo" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8d7210 83e0c0 8bd3 8b5de4 8945dc 8b4508 2bd8 } // n = 7, score = 200 // 8d7210 | lea esi, [edx + 0x10] // 83e0c0 | and eax, 0xffffffc0 // 8bd3 | mov edx, ebx // 8b5de4 | mov ebx, dword ptr [ebp - 0x1c] // 8945dc | mov dword ptr [ebp - 0x24], eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 2bd8 | sub ebx, eax $sequence_1 = { e8???????? 50 e8???????? 83c404 ba???????? ff7664 51 } // n = 7, score = 200 // e8???????? | // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // ba???????? | // ff7664 | push dword ptr [esi + 0x64] // 51 | push ecx $sequence_2 = { ff75bc e8???????? ff75c0 e8???????? ff75cc e8???????? } // n = 6, score = 200 // ff75bc | push dword ptr [ebp - 0x44] // e8???????? | // ff75c0 | push dword ptr [ebp - 0x40] // e8???????? | // ff75cc | push dword ptr [ebp - 0x34] // e8???????? | $sequence_3 = { 8b4e50 8b5648 894491fc 8b4d0c e8???????? 8b4e54 8b5648 } // n = 7, score = 200 // 8b4e50 | mov ecx, dword ptr [esi + 0x50] // 8b5648 | mov edx, dword ptr [esi + 0x48] // 894491fc | mov dword ptr [ecx + edx*4 - 4], eax // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // e8???????? | // 8b4e54 | mov ecx, dword ptr [esi + 0x54] // 8b5648 | mov edx, dword ptr [esi + 0x48] $sequence_4 = { ba01000000 d3e2 89559c 8b55b4 894da8 85d2 7554 } // n = 7, score = 200 // ba01000000 | mov edx, 1 // d3e2 | shl edx, cl // 89559c | mov dword ptr [ebp - 0x64], edx // 8b55b4 | mov edx, dword ptr [ebp - 0x4c] // 894da8 | mov dword ptr [ebp - 0x58], ecx // 85d2 | test edx, edx // 7554 | jne 0x56 $sequence_5 = { 8b06 0fb67c0801 c1e708 0b7de4 897e10 8d4102 3bc2 } // n = 7, score = 200 // 8b06 | mov eax, dword ptr [esi] // 0fb67c0801 | movzx edi, byte ptr [eax + ecx + 1] // c1e708 | shl edi, 8 // 0b7de4 | or edi, dword ptr [ebp - 0x1c] // 897e10 | mov dword ptr [esi + 0x10], edi // 8d4102 | lea eax, [ecx + 2] // 3bc2 | cmp eax, edx $sequence_6 = { 7528 0fb64d0f 0fb642ff c1e108 03c8 3b4b18 7516 } // n = 7, score = 200 // 7528 | jne 0x2a // 0fb64d0f | movzx ecx, byte ptr [ebp + 0xf] // 0fb642ff | movzx eax, byte ptr [edx - 1] // c1e108 | shl ecx, 8 // 03c8 | add ecx, eax // 3b4b18 | cmp ecx, dword ptr [ebx + 0x18] // 7516 | jne 0x18 $sequence_7 = { 8806 33c0 5e 5b 8be5 5d } // n = 6, score = 200 // 8806 | mov byte ptr [esi], al // 33c0 | xor eax, eax // 5e | pop esi // 5b | pop ebx // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_8 = { 5f 5e 5b 894491fc 33c0 8be5 5d } // n = 7, score = 200 // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 894491fc | mov dword ptr [ecx + edx*4 - 4], eax // 33c0 | xor eax, eax // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_9 = { 85c0 0f85ea000000 8b5604 83fa08 7527 837e1000 } // n = 6, score = 200 // 85c0 | test eax, eax // 0f85ea000000 | jne 0xf0 // 8b5604 | mov edx, dword ptr [esi + 4] // 83fa08 | cmp edx, 8 // 7527 | jne 0x29 // 837e1000 | cmp dword ptr [esi + 0x10], 0 condition: 7 of them and filesize < 712704 }
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