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rule win_snifula_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.snifula." 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.snifula" 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 = { 53 ff35???????? ffd7 6800040000 53 ff35???????? } // n = 6, score = 200 // 53 | push ebx // ff35???????? | // ffd7 | call edi // 6800040000 | push 0x400 // 53 | push ebx // ff35???????? | $sequence_1 = { 53 6a00 ff35???????? ff15???????? b8???????? 83c9ff } // n = 6, score = 200 // 53 | push ebx // 6a00 | push 0 // ff35???????? | // ff15???????? | // b8???????? | // 83c9ff | or ecx, 0xffffffff $sequence_2 = { 6a00 ff35???????? 8945fc ff15???????? 8bf8 85ff } // n = 6, score = 200 // 6a00 | push 0 // ff35???????? | // 8945fc | mov dword ptr [ebp - 4], eax // ff15???????? | // 8bf8 | mov edi, eax // 85ff | test edi, edi $sequence_3 = { a1???????? 85c0 75ef 53 57 bb???????? } // n = 6, score = 200 // a1???????? | // 85c0 | test eax, eax // 75ef | jne 0xfffffff1 // 53 | push ebx // 57 | push edi // bb???????? | $sequence_4 = { ff15???????? 8bf8 83ffff 747f 53 8d450c 50 } // n = 7, score = 200 // ff15???????? | // 8bf8 | mov edi, eax // 83ffff | cmp edi, -1 // 747f | je 0x81 // 53 | push ebx // 8d450c | lea eax, [ebp + 0xc] // 50 | push eax $sequence_5 = { e8???????? 85c0 740c 81386368756e 7504 834e1002 8bc6 } // n = 7, score = 200 // e8???????? | // 85c0 | test eax, eax // 740c | je 0xe // 81386368756e | cmp dword ptr [eax], 0x6e756863 // 7504 | jne 6 // 834e1002 | or dword ptr [esi + 0x10], 2 // 8bc6 | mov eax, esi $sequence_6 = { c1e802 25ff000000 8d44c72c 8b18 3bd8 7432 } // n = 6, score = 200 // c1e802 | shr eax, 2 // 25ff000000 | and eax, 0xff // 8d44c72c | lea eax, [edi + eax*8 + 0x2c] // 8b18 | mov ebx, dword ptr [eax] // 3bd8 | cmp ebx, eax // 7432 | je 0x34 $sequence_7 = { 83f803 7533 ff7304 8bc7 ff750c e8???????? 8b4724 } // n = 7, score = 200 // 83f803 | cmp eax, 3 // 7533 | jne 0x35 // ff7304 | push dword ptr [ebx + 4] // 8bc7 | mov eax, edi // ff750c | push dword ptr [ebp + 0xc] // e8???????? | // 8b4724 | mov eax, dword ptr [edi + 0x24] $sequence_8 = { 68???????? 56 ff15???????? 83c414 68???????? 56 } // n = 6, score = 200 // 68???????? | // 56 | push esi // ff15???????? | // 83c414 | add esp, 0x14 // 68???????? | // 56 | push esi $sequence_9 = { 53 50 889c243c010000 e8???????? a1???????? 83c43c 895c2430 } // n = 7, score = 200 // 53 | push ebx // 50 | push eax // 889c243c010000 | mov byte ptr [esp + 0x13c], bl // e8???????? | // a1???????? | // 83c43c | add esp, 0x3c // 895c2430 | mov dword ptr [esp + 0x30], ebx condition: 7 of them and filesize < 188416 }
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