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rule win_micrass_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.micrass." 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.micrass" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 59 89442424 8d442408 6a50 } // n = 4, score = 100 // 59 | pop ecx // 89442424 | mov dword ptr [esp + 0x24], eax // 8d442408 | lea eax, [esp + 8] // 6a50 | push 0x50 $sequence_1 = { 66890c45c4cc4000 40 ebe8 33c0 8945e4 3d01010000 7d0d } // n = 7, score = 100 // 66890c45c4cc4000 | mov word ptr [eax*2 + 0x40ccc4], cx // 40 | inc eax // ebe8 | jmp 0xffffffea // 33c0 | xor eax, eax // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 3d01010000 | cmp eax, 0x101 // 7d0d | jge 0xf $sequence_2 = { 8dbdccfdffff a5 a5 a5 a5 } // n = 5, score = 100 // 8dbdccfdffff | lea edi, [ebp - 0x234] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] $sequence_3 = { 6a06 89430c 8d4310 8d8984194000 5a 668b31 } // n = 6, score = 100 // 6a06 | push 6 // 89430c | mov dword ptr [ebx + 0xc], eax // 8d4310 | lea eax, [ebx + 0x10] // 8d8984194000 | lea ecx, [ecx + 0x401984] // 5a | pop edx // 668b31 | mov si, word ptr [ecx] $sequence_4 = { 8d85f8afffff 6a00 50 e8???????? 68???????? 57 e8???????? } // n = 7, score = 100 // 8d85f8afffff | lea eax, [ebp - 0x5008] // 6a00 | push 0 // 50 | push eax // e8???????? | // 68???????? | // 57 | push edi // e8???????? | $sequence_5 = { 53 8985b83fffff 8d85c03fffff 57 50 89bddc9fffff } // n = 6, score = 100 // 53 | push ebx // 8985b83fffff | mov dword ptr [ebp - 0xc048], eax // 8d85c03fffff | lea eax, [ebp - 0xc040] // 57 | push edi // 50 | push eax // 89bddc9fffff | mov dword ptr [ebp - 0x6024], edi $sequence_6 = { 56 b9???????? 8bf2 2bc8 2bf0 8a1401 } // n = 6, score = 100 // 56 | push esi // b9???????? | // 8bf2 | mov esi, edx // 2bc8 | sub ecx, eax // 2bf0 | sub esi, eax // 8a1401 | mov dl, byte ptr [ecx + eax] $sequence_7 = { 8985e4fbffff 6a05 59 be???????? } // n = 4, score = 100 // 8985e4fbffff | mov dword ptr [ebp - 0x41c], eax // 6a05 | push 5 // 59 | pop ecx // be???????? | $sequence_8 = { 50 c744244801010000 e8???????? 59 50 89442414 } // n = 6, score = 100 // 50 | push eax // c744244801010000 | mov dword ptr [esp + 0x48], 0x101 // e8???????? | // 59 | pop ecx // 50 | push eax // 89442414 | mov dword ptr [esp + 0x14], eax $sequence_9 = { 8bcb e8???????? 59 837e4400 57 bf???????? } // n = 6, score = 100 // 8bcb | mov ecx, ebx // e8???????? | // 59 | pop ecx // 837e4400 | cmp dword ptr [esi + 0x44], 0 // 57 | push edi // bf???????? | condition: 7 of them and filesize < 163840 }
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