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rule win_lodeinfo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 3bcf 72d9 e9???????? bf0f000000 897df8 e9???????? bf36000000 } // n = 7, score = 200 // 3bcf | cmp ecx, edi // 72d9 | jb 0xffffffdb // e9???????? | // bf0f000000 | mov edi, 0xf // 897df8 | mov dword ptr [ebp - 8], edi // e9???????? | // bf36000000 | mov edi, 0x36 $sequence_1 = { 0fb64703 c1e108 0bc8 03d1 894c2418 } // n = 5, score = 200 // 0fb64703 | movzx eax, byte ptr [edi + 3] // c1e108 | shl ecx, 8 // 0bc8 | or ecx, eax // 03d1 | add edx, ecx // 894c2418 | mov dword ptr [esp + 0x18], ecx $sequence_2 = { 50 e8???????? 83c404 ba???????? ff7608 51 b9???????? } // n = 7, score = 200 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // ba???????? | // ff7608 | push dword ptr [esi + 8] // 51 | push ecx // b9???????? | $sequence_3 = { 8ac3 b107 2407 03ff 2ac8 8bc3 c1e803 } // n = 7, score = 200 // 8ac3 | mov al, bl // b107 | mov cl, 7 // 2407 | and al, 7 // 03ff | add edi, edi // 2ac8 | sub cl, al // 8bc3 | mov eax, ebx // c1e803 | shr eax, 3 $sequence_4 = { 0fb60f 0fb64701 c1e108 03c1 5f 89461c 894618 } // n = 7, score = 200 // 0fb60f | movzx ecx, byte ptr [edi] // 0fb64701 | movzx eax, byte ptr [edi + 1] // c1e108 | shl ecx, 8 // 03c1 | add eax, ecx // 5f | pop edi // 89461c | mov dword ptr [esi + 0x1c], eax // 894618 | mov dword ptr [esi + 0x18], eax $sequence_5 = { c7818800000000000000 c7819000000000000000 c781b400000000000000 c781bc00000000000000 c781c000000000000000 c781c400000000000000 660fd681cc000000 } // n = 7, score = 200 // c7818800000000000000 | mov dword ptr [ecx + 0x88], 0 // c7819000000000000000 | mov dword ptr [ecx + 0x90], 0 // c781b400000000000000 | mov dword ptr [ecx + 0xb4], 0 // c781bc00000000000000 | mov dword ptr [ecx + 0xbc], 0 // c781c000000000000000 | mov dword ptr [ecx + 0xc0], 0 // c781c400000000000000 | mov dword ptr [ecx + 0xc4], 0 // 660fd681cc000000 | movq qword ptr [ecx + 0xcc], xmm0 $sequence_6 = { 895de8 8955e4 56 8b750c 57 83f804 } // n = 6, score = 200 // 895de8 | mov dword ptr [ebp - 0x18], ebx // 8955e4 | mov dword ptr [ebp - 0x1c], edx // 56 | push esi // 8b750c | mov esi, dword ptr [ebp + 0xc] // 57 | push edi // 83f804 | cmp eax, 4 $sequence_7 = { 8bcf 017e0c 8bc2 d3e8 894610 b801000000 } // n = 6, score = 200 // 8bcf | mov ecx, edi // 017e0c | add dword ptr [esi + 0xc], edi // 8bc2 | mov eax, edx // d3e8 | shr eax, cl // 894610 | mov dword ptr [esi + 0x10], eax // b801000000 | mov eax, 1 $sequence_8 = { 880456 884c5601 e9???????? 83f802 752b 8b4db4 8bc1 } // n = 7, score = 200 // 880456 | mov byte ptr [esi + edx*2], al // 884c5601 | mov byte ptr [esi + edx*2 + 1], cl // e9???????? | // 83f802 | cmp eax, 2 // 752b | jne 0x2d // 8b4db4 | mov ecx, dword ptr [ebp - 0x4c] // 8bc1 | mov eax, ecx $sequence_9 = { f7f7 884101 8801 8841ff 83c103 8b45f4 83ee01 } // n = 7, score = 200 // f7f7 | div edi // 884101 | mov byte ptr [ecx + 1], al // 8801 | mov byte ptr [ecx], al // 8841ff | mov byte ptr [ecx - 1], al // 83c103 | add ecx, 3 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 83ee01 | sub esi, 1 condition: 7 of them and filesize < 712704 }
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