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rule win_lodeinfo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 730b 8b5df4 8914b3 8b5de4 eb02 8910 8b5508 } // n = 7, score = 200 // 730b | jae 0xd // 8b5df4 | mov ebx, dword ptr [ebp - 0xc] // 8914b3 | mov dword ptr [ebx + esi*4], edx // 8b5de4 | mov ebx, dword ptr [ebp - 0x1c] // eb02 | jmp 4 // 8910 | mov dword ptr [eax], edx // 8b5508 | mov edx, dword ptr [ebp + 8] $sequence_1 = { 50 e8???????? 83c404 837e5c00 0f84e4000000 ff7660 } // n = 6, score = 200 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 837e5c00 | cmp dword ptr [esi + 0x5c], 0 // 0f84e4000000 | je 0xea // ff7660 | push dword ptr [esi + 0x60] $sequence_2 = { 39560c 7433 6690 8b4e08 8d7f03 0fb647fd } // n = 6, score = 200 // 39560c | cmp dword ptr [esi + 0xc], edx // 7433 | je 0x35 // 6690 | nop // 8b4e08 | mov ecx, dword ptr [esi + 8] // 8d7f03 | lea edi, [edi + 3] // 0fb647fd | movzx eax, byte ptr [edi - 3] $sequence_3 = { 53 8bd7 8bce e8???????? 83c408 eb78 83f802 } // n = 7, score = 200 // 53 | push ebx // 8bd7 | mov edx, edi // 8bce | mov ecx, esi // e8???????? | // 83c408 | add esp, 8 // eb78 | jmp 0x7a // 83f802 | cmp eax, 2 $sequence_4 = { 8983c4000000 85c0 7412 ff75f4 8b55f0 8bc8 e8???????? } // n = 7, score = 200 // 8983c4000000 | mov dword ptr [ebx + 0xc4], eax // 85c0 | test eax, eax // 7412 | je 0x14 // ff75f4 | push dword ptr [ebp - 0xc] // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // 8bc8 | mov ecx, eax // e8???????? | $sequence_5 = { 8b7d0c 807c330200 8a443301 8845eb 740a be48000000 e9???????? } // n = 7, score = 200 // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 807c330200 | cmp byte ptr [ebx + esi + 2], 0 // 8a443301 | mov al, byte ptr [ebx + esi + 1] // 8845eb | mov byte ptr [ebp - 0x15], al // 740a | je 0xc // be48000000 | mov esi, 0x48 // e9???????? | $sequence_6 = { 85d2 0f847efcffff 33c9 0f1f440000 8b45f0 8b0401 89040a } // n = 7, score = 200 // 85d2 | test edx, edx // 0f847efcffff | je 0xfffffc84 // 33c9 | xor ecx, ecx // 0f1f440000 | nop dword ptr [eax + eax] // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8b0401 | mov eax, dword ptr [ecx + eax] // 89040a | mov dword ptr [edx + ecx], eax $sequence_7 = { 7417 8b4608 8b4f08 8a0402 88040a 42 8b460c } // n = 7, score = 200 // 7417 | je 0x19 // 8b4608 | mov eax, dword ptr [esi + 8] // 8b4f08 | mov ecx, dword ptr [edi + 8] // 8a0402 | mov al, byte ptr [edx + eax] // 88040a | mov byte ptr [edx + ecx], al // 42 | inc edx // 8b460c | mov eax, dword ptr [esi + 0xc] $sequence_8 = { 2bc6 3bf8 0f8758010000 2b13 8d043e 8bf2 } // n = 6, score = 200 // 2bc6 | sub eax, esi // 3bf8 | cmp edi, eax // 0f8758010000 | ja 0x15e // 2b13 | sub edx, dword ptr [ebx] // 8d043e | lea eax, [esi + edi] // 8bf2 | mov esi, edx $sequence_9 = { 8d1490 8bcf e8???????? 8b4df4 83c703 8b450c 83c404 } // n = 7, score = 200 // 8d1490 | lea edx, [eax + edx*4] // 8bcf | mov ecx, edi // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 83c703 | add edi, 3 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 83c404 | add esp, 4 condition: 7 of them and filesize < 712704 }
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