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rule win_akira_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.akira." 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.akira" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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???????? 488d8a58000000 e9???????? 4889542410 55 4883ec40 488bea } // n = 7, score = 200 // e9???????? | // 488d8a58000000 | dec eax // e9???????? | // 4889542410 | lea ecx, [ebp + 0x6d5] // 55 | dec eax // 4883ec40 | mov edx, eax // 488bea | mov byte ptr [ebp + 0x6dd], 0x79 $sequence_1 = { c1fa06 8bc2 c1e81f 03d0 6bc27f 2bc8 42888c05cb020000 } // n = 7, score = 200 // c1fa06 | dec edx // 8bc2 | movsx eax, byte ptr [ecx + ebx + 0x6b190] // c1e81f | mov eax, dword ptr [ebx + 0xc] // 03d0 | cmp dword ptr [edi + 0xc], eax // 6bc27f | jne 0x20e // 2bc8 | mov al, 1 // 42888c05cb020000 | dec eax $sequence_2 = { 488d4b28 e8???????? 66837b0a00 7413 bab0000000 488bcb e8???????? } // n = 7, score = 200 // 488d4b28 | dec eax // e8???????? | // 66837b0a00 | lea eax, [ecx + 1] // 7413 | dec eax // bab0000000 | mov dword ptr [ebp - 0x11], eax // 488bcb | dec eax // e8???????? | $sequence_3 = { f30f7f442430 33d2 488d4c2430 e8???????? 498b4f18 48394d28 0f854f010000 } // n = 7, score = 200 // f30f7f442430 | lea eax, [ebx + 1] // 33d2 | dec eax // 488d4c2430 | cmp ebx, -1 // e8???????? | // 498b4f18 | dec eax // 48394d28 | cmove eax, ebx // 0f854f010000 | dec eax $sequence_4 = { e8???????? 48895f08 ba18000000 488bcf e8???????? 488d4dd8 ff15???????? } // n = 7, score = 200 // e8???????? | // 48895f08 | mov byte ptr [ebp + 0x24b], 0x74 // ba18000000 | mov byte ptr [ebp + 0x24c], 0x6e // 488bcf | mov byte ptr [ebp + 0x24d], 0x32 // e8???????? | // 488d4dd8 | mov byte ptr [ebp + 0x24e], 0x6e // ff15???????? | $sequence_5 = { ff5020 88442430 0f57c0 0f11459f 48c745af01000000 41bf0f000000 4c897db7 } // n = 7, score = 200 // ff5020 | dec eax // 88442430 | mov eax, ebx // 0f57c0 | dec eax // 0f11459f | add esp, 0x50 // 48c745af01000000 | pop ebx // 41bf0f000000 | ret // 4c897db7 | dec eax $sequence_6 = { 4584ed 7444 498d5eff 488b75df 483bde 7425 e8???????? } // n = 7, score = 200 // 4584ed | dec ecx // 7444 | mov dword ptr [ecx + 8], edx // 498d5eff | inc ecx // 488b75df | mov dword ptr [ecx + 0x24], eax // 483bde | movzx ecx, byte ptr [edx] // 7425 | and ecx, 0xf // e8???????? | $sequence_7 = { 66660f1f840000000000 49ffc0 6642833c4000 75f5 488d9539030000 488d8de0150000 e8???????? } // n = 7, score = 200 // 66660f1f840000000000 | jne 0xc35 // 49ffc0 | dec eax // 6642833c4000 | lea edx, [esp + 0x21] // 75f5 | dec eax // 488d9539030000 | lea ecx, [ebp + 0x30] // 488d8de0150000 | dec esp // e8???????? | $sequence_8 = { 41884640 41c6464101 498b0c24 48894c2430 4885c9 7445 488b5770 } // n = 7, score = 200 // 41884640 | inc ecx // 41c6464101 | mov byte ptr [esi], 0x2d // 498b0c24 | dec ebp // 48894c2430 | lea edi, [esi + 1] // 4885c9 | dec eax // 7445 | mov ecx, dword ptr [edi] // 488b5770 | dec eax $sequence_9 = { 7508 c60330 48ffcb ebdf fec1 880b 483bde } // n = 7, score = 200 // 7508 | dec eax // c60330 | lea ecx, [0x8bcb9] // 48ffcb | dec eax // ebdf | mov eax, dword ptr [0x58] // fec1 | mov edx, 4 // 880b | dec eax // 483bde | mov ecx, dword ptr [eax] condition: 7 of them and filesize < 1286144 }
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