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rule win_lodeinfo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { e9???????? c6041600 85f6 741c 8bfb 8bca } // n = 6, score = 200 // e9???????? | // c6041600 | mov byte ptr [esi + edx], 0 // 85f6 | test esi, esi // 741c | je 0x1e // 8bfb | mov edi, ebx // 8bca | mov ecx, edx $sequence_1 = { 837b1c00 750a c783700100001e000000 83bb9800000003 7513 83bba000000000 } // n = 6, score = 200 // 837b1c00 | cmp dword ptr [ebx + 0x1c], 0 // 750a | jne 0xc // c783700100001e000000 | mov dword ptr [ebx + 0x170], 0x1e // 83bb9800000003 | cmp dword ptr [ebx + 0x98], 3 // 7513 | jne 0x15 // 83bba000000000 | cmp dword ptr [ebx + 0xa0], 0 $sequence_2 = { 3bf2 743f 50 ffb548ffffff 51 8b8d5cffffff 8bd1 } // n = 7, score = 200 // 3bf2 | cmp esi, edx // 743f | je 0x41 // 50 | push eax // ffb548ffffff | push dword ptr [ebp - 0xb8] // 51 | push ecx // 8b8d5cffffff | mov ecx, dword ptr [ebp - 0xa4] // 8bd1 | mov edx, ecx $sequence_3 = { 0f1f4000 8a4c0704 884c0444 40 83f804 75f2 8d4c2444 } // n = 7, score = 200 // 0f1f4000 | nop dword ptr [eax] // 8a4c0704 | mov cl, byte ptr [edi + eax + 4] // 884c0444 | mov byte ptr [esp + eax + 0x44], cl // 40 | inc eax // 83f804 | cmp eax, 4 // 75f2 | jne 0xfffffff4 // 8d4c2444 | lea ecx, [esp + 0x44] $sequence_4 = { 56 8b7518 8bda 8b5508 57 8bf9 895df8 } // n = 7, score = 200 // 56 | push esi // 8b7518 | mov esi, dword ptr [ebp + 0x18] // 8bda | mov ebx, edx // 8b5508 | mov edx, dword ptr [ebp + 8] // 57 | push edi // 8bf9 | mov edi, ecx // 895df8 | mov dword ptr [ebp - 8], ebx $sequence_5 = { 52 50 e8???????? 83c408 8b4d08 8b450c 03c1 } // n = 7, score = 200 // 52 | push edx // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8b450c | mov eax, dword ptr [ebp + 0xc] // 03c1 | add eax, ecx $sequence_6 = { 85ff 7430 8b4d08 83c602 83c104 0fb641fc } // n = 6, score = 200 // 85ff | test edi, edi // 7430 | je 0x32 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 83c602 | add esi, 2 // 83c104 | add ecx, 4 // 0fb641fc | movzx eax, byte ptr [ecx - 4] $sequence_7 = { 8d8424cc010000 51 50 8d4c242c e8???????? 8b542438 8d442424 } // n = 7, score = 200 // 8d8424cc010000 | lea eax, [esp + 0x1cc] // 51 | push ecx // 50 | push eax // 8d4c242c | lea ecx, [esp + 0x2c] // e8???????? | // 8b542438 | mov edx, dword ptr [esp + 0x38] // 8d442424 | lea eax, [esp + 0x24] $sequence_8 = { eb05 8d3c76 d1ef 57 ff75f0 e8???????? 83c408 } // n = 7, score = 200 // eb05 | jmp 7 // 8d3c76 | lea edi, [esi + esi*2] // d1ef | shr edi, 1 // 57 | push edi // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // 83c408 | add esp, 8 $sequence_9 = { 024df5 83c603 8b45c8 8975ec } // n = 4, score = 200 // 024df5 | add cl, byte ptr [ebp - 0xb] // 83c603 | add esi, 3 // 8b45c8 | mov eax, dword ptr [ebp - 0x38] // 8975ec | mov dword ptr [ebp - 0x14], esi condition: 7 of them and filesize < 712704 }
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