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rule win_elirks_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.elirks" 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 = { 68???????? 56 ff15???????? 8bf8 3bfb 897c2420 } // n = 6, score = 100 // 68???????? | // 56 | push esi // ff15???????? | // 8bf8 | mov edi, eax // 3bfb | cmp edi, ebx // 897c2420 | mov dword ptr [esp + 0x20], edi $sequence_1 = { f7ea 8bc2 c1e81f 03c2 03c0 03c0 85c9 } // n = 7, score = 100 // f7ea | imul edx // 8bc2 | mov eax, edx // c1e81f | shr eax, 0x1f // 03c2 | add eax, edx // 03c0 | add eax, eax // 03c0 | add eax, eax // 85c9 | test ecx, ecx $sequence_2 = { 8b4c2408 8d742410 e8???????? 8d742408 e8???????? 5f 5e } // n = 7, score = 100 // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 8d742410 | lea esi, [esp + 0x10] // e8???????? | // 8d742408 | lea esi, [esp + 8] // e8???????? | // 5f | pop edi // 5e | pop esi $sequence_3 = { 51 ff15???????? c744240801000080 8b54240c 52 ff15???????? } // n = 6, score = 100 // 51 | push ecx // ff15???????? | // c744240801000080 | mov dword ptr [esp + 8], 0x80000001 // 8b54240c | mov edx, dword ptr [esp + 0xc] // 52 | push edx // ff15???????? | $sequence_4 = { 8d942424030000 52 bf???????? e8???????? 83c410 85c0 7448 } // n = 7, score = 100 // 8d942424030000 | lea edx, [esp + 0x324] // 52 | push edx // bf???????? | // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 7448 | je 0x4a $sequence_5 = { 8b4c2418 6bf64c 03f3 8bc6 8b10 8911 8b5004 } // n = 7, score = 100 // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] // 6bf64c | imul esi, esi, 0x4c // 03f3 | add esi, ebx // 8bc6 | mov eax, esi // 8b10 | mov edx, dword ptr [eax] // 8911 | mov dword ptr [ecx], edx // 8b5004 | mov edx, dword ptr [eax + 4] $sequence_6 = { c7861860000007010200 c744240c10000000 ff15???????? 8b442404 8d542404 } // n = 5, score = 100 // c7861860000007010200 | mov dword ptr [esi + 0x6018], 0x20107 // c744240c10000000 | mov dword ptr [esp + 0xc], 0x10 // ff15???????? | // 8b442404 | mov eax, dword ptr [esp + 4] // 8d542404 | lea edx, [esp + 4] $sequence_7 = { 83c501 83fd1a 0f8c5fffffff 5f } // n = 4, score = 100 // 83c501 | add ebp, 1 // 83fd1a | cmp ebp, 0x1a // 0f8c5fffffff | jl 0xffffff65 // 5f | pop edi $sequence_8 = { 2bd1 8d4aff 85c9 8908 7e28 8b4c241c } // n = 6, score = 100 // 2bd1 | sub edx, ecx // 8d4aff | lea ecx, [edx - 1] // 85c9 | test ecx, ecx // 8908 | mov dword ptr [eax], ecx // 7e28 | jle 0x2a // 8b4c241c | mov ecx, dword ptr [esp + 0x1c] $sequence_9 = { 51 ff15???????? 55 6800010000 6a02 55 6a01 } // n = 7, score = 100 // 51 | push ecx // ff15???????? | // 55 | push ebp // 6800010000 | push 0x100 // 6a02 | push 2 // 55 | push ebp // 6a01 | push 1 condition: 7 of them and filesize < 81920 }
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