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rule win_lodeinfo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8b01 8b4024 ffd0 3b45cc 7557 85d2 7553 } // n = 7, score = 200 // 8b01 | mov eax, dword ptr [ecx] // 8b4024 | mov eax, dword ptr [eax + 0x24] // ffd0 | call eax // 3b45cc | cmp eax, dword ptr [ebp - 0x34] // 7557 | jne 0x59 // 85d2 | test edx, edx // 7553 | jne 0x55 $sequence_1 = { c745d000000000 03c7 3bc1 0f825a040000 3b4608 0f8751040000 } // n = 6, score = 200 // c745d000000000 | mov dword ptr [ebp - 0x30], 0 // 03c7 | add eax, edi // 3bc1 | cmp eax, ecx // 0f825a040000 | jb 0x460 // 3b4608 | cmp eax, dword ptr [esi + 8] // 0f8751040000 | ja 0x457 $sequence_2 = { 03c1 0faf8544ffffff 03f0 8d4703 c1e802 8d8b98000000 898544ffffff } // n = 7, score = 200 // 03c1 | add eax, ecx // 0faf8544ffffff | imul eax, dword ptr [ebp - 0xbc] // 03f0 | add esi, eax // 8d4703 | lea eax, [edi + 3] // c1e802 | shr eax, 2 // 8d8b98000000 | lea ecx, [ebx + 0x98] // 898544ffffff | mov dword ptr [ebp - 0xbc], eax $sequence_3 = { 50 0fb64702 b9???????? 50 0fb64701 50 0fb607 } // n = 7, score = 200 // 50 | push eax // 0fb64702 | movzx eax, byte ptr [edi + 2] // b9???????? | // 50 | push eax // 0fb64701 | movzx eax, byte ptr [edi + 1] // 50 | push eax // 0fb607 | movzx eax, byte ptr [edi] $sequence_4 = { 8bc1 c1e903 83e007 0fafca 0fafc2 83c007 c1e803 } // n = 7, score = 200 // 8bc1 | mov eax, ecx // c1e903 | shr ecx, 3 // 83e007 | and eax, 7 // 0fafca | imul ecx, edx // 0fafc2 | imul eax, edx // 83c007 | add eax, 7 // c1e803 | shr eax, 3 $sequence_5 = { 8955e4 81faff000000 7756 8b55f8 8b4308 8b3a 47 } // n = 7, score = 200 // 8955e4 | mov dword ptr [ebp - 0x1c], edx // 81faff000000 | cmp edx, 0xff // 7756 | ja 0x58 // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8b4308 | mov eax, dword ptr [ebx + 8] // 8b3a | mov edi, dword ptr [edx] // 47 | inc edi $sequence_6 = { 8b4d08 8b45ec 3b4514 0f8404010000 8d3c18 894dd8 2955d8 } // n = 7, score = 200 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 3b4514 | cmp eax, dword ptr [ebp + 0x14] // 0f8404010000 | je 0x10a // 8d3c18 | lea edi, [eax + ebx] // 894dd8 | mov dword ptr [ebp - 0x28], ecx // 2955d8 | sub dword ptr [ebp - 0x28], edx $sequence_7 = { 8b55ec 52 e8???????? 83c404 c745f800000000 c745f400000000 ff75f0 } // n = 7, score = 200 // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 52 | push edx // e8???????? | // 83c404 | add esp, 4 // c745f800000000 | mov dword ptr [ebp - 8], 0 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // ff75f0 | push dword ptr [ebp - 0x10] $sequence_8 = { 0fb65204 c1e218 d3e2 0bd3 8b5de4 eb68 c7461000000000 } // n = 7, score = 200 // 0fb65204 | movzx edx, byte ptr [edx + 4] // c1e218 | shl edx, 0x18 // d3e2 | shl edx, cl // 0bd3 | or edx, ebx // 8b5de4 | mov ebx, dword ptr [ebp - 0x1c] // eb68 | jmp 0x6a // c7461000000000 | mov dword ptr [esi + 0x10], 0 $sequence_9 = { c745c000000000 c745cc00000000 8d0479 c745d000000000 03c7 3bc1 0f825a040000 } // n = 7, score = 200 // c745c000000000 | mov dword ptr [ebp - 0x40], 0 // c745cc00000000 | mov dword ptr [ebp - 0x34], 0 // 8d0479 | lea eax, [ecx + edi*2] // c745d000000000 | mov dword ptr [ebp - 0x30], 0 // 03c7 | add eax, edi // 3bc1 | cmp eax, ecx // 0f825a040000 | jb 0x460 condition: 7 of them and filesize < 712704 }
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