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rule win_atmitch_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.atmitch." 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.atmitch" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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???????? ff15???????? e8???????? 8b06 8b4818 83c408 51 } // n = 7, score = 100 // 68???????? | // ff15???????? | // e8???????? | // 8b06 | mov eax, dword ptr [esi] // 8b4818 | mov ecx, dword ptr [eax + 0x18] // 83c408 | add esp, 8 // 51 | push ecx $sequence_1 = { ff15???????? 50 ff15???????? 6aff b9???????? 8bf0 } // n = 6, score = 100 // ff15???????? | // 50 | push eax // ff15???????? | // 6aff | push -1 // b9???????? | // 8bf0 | mov esi, eax $sequence_2 = { e8???????? 8b442424 8b4c2440 64890d00000000 } // n = 4, score = 100 // e8???????? | // 8b442424 | mov eax, dword ptr [esp + 0x24] // 8b4c2440 | mov ecx, dword ptr [esp + 0x40] // 64890d00000000 | mov dword ptr fs:[0], ecx $sequence_3 = { c744242000000000 833d????????02 7f05 e8???????? a1???????? } // n = 5, score = 100 // c744242000000000 | mov dword ptr [esp + 0x20], 0 // 833d????????02 | // 7f05 | jg 7 // e8???????? | // a1???????? | $sequence_4 = { e8???????? 81c428040000 c3 56 } // n = 4, score = 100 // e8???????? | // 81c428040000 | add esp, 0x428 // c3 | ret // 56 | push esi $sequence_5 = { 8b4004 85c0 7409 8b10 } // n = 4, score = 100 // 8b4004 | mov eax, dword ptr [eax + 4] // 85c0 | test eax, eax // 7409 | je 0xb // 8b10 | mov edx, dword ptr [eax] $sequence_6 = { 8d4c2420 c644244c04 ff15???????? 8d4c2420 c644244803 ff15???????? } // n = 6, score = 100 // 8d4c2420 | lea ecx, dword ptr [esp + 0x20] // c644244c04 | mov byte ptr [esp + 0x4c], 4 // ff15???????? | // 8d4c2420 | lea ecx, dword ptr [esp + 0x20] // c644244803 | mov byte ptr [esp + 0x48], 3 // ff15???????? | $sequence_7 = { 8d4c2430 e8???????? 8bf0 8bfa 8bce 0bcf 89742424 } // n = 7, score = 100 // 8d4c2430 | lea ecx, dword ptr [esp + 0x30] // e8???????? | // 8bf0 | mov esi, eax // 8bfa | mov edi, edx // 8bce | mov ecx, esi // 0bcf | or ecx, edi // 89742424 | mov dword ptr [esp + 0x24], esi $sequence_8 = { 837c246c00 742f 8b442408 8b40f4 50 8d4c240c ff15???????? } // n = 7, score = 100 // 837c246c00 | cmp dword ptr [esp + 0x6c], 0 // 742f | je 0x31 // 8b442408 | mov eax, dword ptr [esp + 8] // 8b40f4 | mov eax, dword ptr [eax - 0xc] // 50 | push eax // 8d4c240c | lea ecx, dword ptr [esp + 0xc] // ff15???????? | $sequence_9 = { 89842420040000 56 51 8bcc 8964240c 68???????? ff15???????? } // n = 7, score = 100 // 89842420040000 | mov dword ptr [esp + 0x420], eax // 56 | push esi // 51 | push ecx // 8bcc | mov ecx, esp // 8964240c | mov dword ptr [esp + 0xc], esp // 68???????? | // ff15???????? | condition: 7 of them and filesize < 73728 }
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