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rule win_smac_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.smac." 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.smac" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 33c0 668945ae 8d45b0 50 ff35???????? c745b06c737472 c745b4636d7069 } // n = 7, score = 200 // 33c0 | xor eax, eax // 668945ae | mov word ptr [ebp - 0x52], ax // 8d45b0 | lea eax, [ebp - 0x50] // 50 | push eax // ff35???????? | // c745b06c737472 | mov dword ptr [ebp - 0x50], 0x7274736c // c745b4636d7069 | mov dword ptr [ebp - 0x4c], 0x69706d63 $sequence_1 = { 8d45b4 50 8d8560ffffff 50 8d7d98 c645fc0b } // n = 6, score = 200 // 8d45b4 | lea eax, [ebp - 0x4c] // 50 | push eax // 8d8560ffffff | lea eax, [ebp - 0xa0] // 50 | push eax // 8d7d98 | lea edi, [ebp - 0x68] // c645fc0b | mov byte ptr [ebp - 4], 0xb $sequence_2 = { 8d45bc 50 ff15???????? 33c0 56 6689850cf9ffff 8d850ef9ffff } // n = 7, score = 200 // 8d45bc | lea eax, [ebp - 0x44] // 50 | push eax // ff15???????? | // 33c0 | xor eax, eax // 56 | push esi // 6689850cf9ffff | mov word ptr [ebp - 0x6f4], ax // 8d850ef9ffff | lea eax, [ebp - 0x6f2] $sequence_3 = { 0f82ab0f0000 ff15???????? a3???????? 33c0 c78528f1ffff07000000 899d24f1ffff } // n = 6, score = 200 // 0f82ab0f0000 | jb 0xfb1 // ff15???????? | // a3???????? | // 33c0 | xor eax, eax // c78528f1ffff07000000 | mov dword ptr [ebp - 0xed8], 7 // 899d24f1ffff | mov dword ptr [ebp - 0xedc], ebx $sequence_4 = { ff93c8000000 8b8394000000 85c0 7407 50 ff93c8000000 ffb3c4000000 } // n = 7, score = 200 // ff93c8000000 | call dword ptr [ebx + 0xc8] // 8b8394000000 | mov eax, dword ptr [ebx + 0x94] // 85c0 | test eax, eax // 7407 | je 9 // 50 | push eax // ff93c8000000 | call dword ptr [ebx + 0xc8] // ffb3c4000000 | push dword ptr [ebx + 0xc4] $sequence_5 = { ffd7 89856cf4ffff 83f8ff 0f84bd000000 } // n = 4, score = 200 // ffd7 | call edi // 89856cf4ffff | mov dword ptr [ebp - 0xb94], eax // 83f8ff | cmp eax, -1 // 0f84bd000000 | je 0xc3 $sequence_6 = { 8d852cfcffff 6a5c 50 e8???????? 68???????? 8d8534feffff 50 } // n = 7, score = 200 // 8d852cfcffff | lea eax, [ebp - 0x3d4] // 6a5c | push 0x5c // 50 | push eax // e8???????? | // 68???????? | // 8d8534feffff | lea eax, [ebp - 0x1cc] // 50 | push eax $sequence_7 = { 50 ff15???????? 83f8ff 7504 33f6 eb20 } // n = 6, score = 200 // 50 | push eax // ff15???????? | // 83f8ff | cmp eax, -1 // 7504 | jne 6 // 33f6 | xor esi, esi // eb20 | jmp 0x22 $sequence_8 = { 57 8bf8 83cbff 895dfc 3bcf 0f829a010000 8bc1 } // n = 7, score = 200 // 57 | push edi // 8bf8 | mov edi, eax // 83cbff | or ebx, 0xffffffff // 895dfc | mov dword ptr [ebp - 4], ebx // 3bcf | cmp ecx, edi // 0f829a010000 | jb 0x1a0 // 8bc1 | mov eax, ecx $sequence_9 = { c645fc0d e8???????? 8d45d0 50 8d45b4 50 8d8560ffffff } // n = 7, score = 200 // c645fc0d | mov byte ptr [ebp - 4], 0xd // e8???????? | // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 8d45b4 | lea eax, [ebp - 0x4c] // 50 | push eax // 8d8560ffffff | lea eax, [ebp - 0xa0] condition: 7 of them and filesize < 212992 }
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