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rule win_akira_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { 4d3bca 7223 49893b 41c7430802000000 41c6431001 e9???????? b8ffffffff } // n = 7, score = 100 // 4d3bca | mov dword ptr [esp + 0x20], ebp // 7223 | inc ecx // 49893b | sub dh, bh // 41c7430802000000 | imul ebp, edi // 41c6431001 | inc eax // e9???????? | // b8ffffffff | movsx eax, dh $sequence_1 = { e8???????? 4c8bc0 488bd3 488d4c2440 e8???????? 488d154de80600 488d4c2440 } // n = 7, score = 100 // e8???????? | // 4c8bc0 | dec eax // 488bd3 | sub esp, ecx // 488d4c2440 | dec eax // e8???????? | // 488d154de80600 | lea ebx, [esp + 0x50] // 488d4c2440 | dec eax $sequence_2 = { 488d8597010000 4c8bc7 0f1f840000000000 49ffc0 6642833c4000 75f5 488d9597010000 } // n = 7, score = 100 // 488d8597010000 | dec eax // 4c8bc7 | mov eax, dword ptr [ebp - 8] // 0f1f840000000000 | dec eax // 49ffc0 | mov ebx, dword ptr [eax + 0x88] // 6642833c4000 | dec eax // 75f5 | mov eax, dword ptr [ebp - 0x20] // 488d9597010000 | dec eax $sequence_3 = { 742c 4c8bc6 488d15fbf80400 488bcf e8???????? 488d55c0 48837dd810 } // n = 7, score = 100 // 742c | dec eax // 4c8bc6 | mov edi, eax // 488d15fbf80400 | jmp 0x3c2 // 488bcf | dec ecx // e8???????? | // 488d55c0 | mov edi, ebp // 48837dd810 | dec eax $sequence_4 = { 488bd9 488bc2 488d0d45550400 0f57c0 488d5308 48890b 488d4808 } // n = 7, score = 100 // 488bd9 | mov edi, dword ptr [edi + 8] // 488bc2 | dec eax // 488d0d45550400 | test edi, edi // 0f57c0 | jne 0x4f // 488d5308 | dec eax // 48890b | mov edi, dword ptr [ebp - 0x79] // 488d4808 | dec eax $sequence_5 = { 488d542420 e8???????? 8bf8 85c0 750d f744243010000000 0f95c3 } // n = 7, score = 100 // 488d542420 | test edi, edi // e8???????? | // 8bf8 | jne 0x649 // 85c0 | mov edx, dword ptr [esp + 0x3b8] // 750d | cmp edx, 0x3b9aca00 // f744243010000000 | dec eax // 0f95c3 | lea eax, [esp + 0x50] $sequence_6 = { 488b842430010000 668910 4c892b e8???????? eb7a 0f1f00 488d4b28 } // n = 7, score = 100 // 488b842430010000 | add edx, ecx // 668910 | dec eax // 4c892b | sar edx, 6 // e8???????? | // eb7a | dec eax // 0f1f00 | mov eax, edx // 488d4b28 | dec eax $sequence_7 = { 0f57c0 0f118580110000 0f57c9 660f7f8d90110000 488d85d9010000 4c8bc7 660f1f440000 } // n = 7, score = 100 // 0f57c0 | mov eax, edi // 0f118580110000 | nop dword ptr [eax + eax] // 0f57c9 | dec ecx // 660f7f8d90110000 | inc eax // 488d85d9010000 | movups xmmword ptr [ebp + 0xfc0], xmm0 // 4c8bc7 | xorps xmm1, xmm1 // 660f1f440000 | movdqa xmmword ptr [ebp + 0xfd0], xmm1 $sequence_8 = { 4688840da5000000 49ffc1 4983f90a 72a1 0f57c0 0f1185c00c0000 0f57c9 } // n = 7, score = 100 // 4688840da5000000 | cmp ecx, dword ptr [eax] // 49ffc1 | jne 0xd18 // 4983f90a | dec eax // 72a1 | add eax, 2 // 0f57c0 | dec ecx // 0f1185c00c0000 | sub edx, esp // 0f57c9 | jne 0xcc9 $sequence_9 = { 6666660f1f840000000000 420fb68c0d84000000 83e955 446bc11f b809040281 41f7e8 } // n = 6, score = 100 // 6666660f1f840000000000 | dec ecx // 420fb68c0d84000000 | inc eax // 83e955 | inc dx // 446bc11f | cmp dword ptr [eax + eax*2], 0 // b809040281 | movdqa xmmword ptr [ebp + 0x1070], xmm1 // 41f7e8 | dec eax condition: 7 of them and filesize < 1219584 }
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