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rule win_snifula_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { 83c414 68???????? 56 68???????? 8bd8 8945fc e8???????? } // n = 7, score = 200 // 83c414 | add esp, 0x14 // 68???????? | // 56 | push esi // 68???????? | // 8bd8 | mov ebx, eax // 8945fc | mov dword ptr [ebp - 4], eax // e8???????? | $sequence_1 = { 8d4df4 51 8b4e04 03c8 51 e8???????? } // n = 6, score = 200 // 8d4df4 | lea ecx, [ebp - 0xc] // 51 | push ecx // 8b4e04 | mov ecx, dword ptr [esi + 4] // 03c8 | add ecx, eax // 51 | push ecx // e8???????? | $sequence_2 = { 53 eb46 8bc3 2b45fc 8945f4 40 50 } // n = 7, score = 200 // 53 | push ebx // eb46 | jmp 0x48 // 8bc3 | mov eax, ebx // 2b45fc | sub eax, dword ptr [ebp - 4] // 8945f4 | mov dword ptr [ebp - 0xc], eax // 40 | inc eax // 50 | push eax $sequence_3 = { ff75f8 ff75f4 68???????? 56 ff15???????? 83c414 68???????? } // n = 7, score = 200 // ff75f8 | push dword ptr [ebp - 8] // ff75f4 | push dword ptr [ebp - 0xc] // 68???????? | // 56 | push esi // ff15???????? | // 83c414 | add esp, 0x14 // 68???????? | $sequence_4 = { 8b45f8 5f c9 c20400 56 } // n = 5, score = 200 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 5f | pop edi // c9 | leave // c20400 | ret 4 // 56 | push esi $sequence_5 = { 85c0 7405 397d08 7407 c7461403000000 f70600000040 7407 } // n = 7, score = 200 // 85c0 | test eax, eax // 7405 | je 7 // 397d08 | cmp dword ptr [ebp + 8], edi // 7407 | je 9 // c7461403000000 | mov dword ptr [esi + 0x14], 3 // f70600000040 | test dword ptr [esi], 0x40000000 // 7407 | je 9 $sequence_6 = { 8b0424 59 c20400 57 6a0c 6a40 33ff } // n = 7, score = 200 // 8b0424 | mov eax, dword ptr [esp] // 59 | pop ecx // c20400 | ret 4 // 57 | push edi // 6a0c | push 0xc // 6a40 | push 0x40 // 33ff | xor edi, edi $sequence_7 = { bf???????? eb19 6a0d 5d 68???????? } // n = 5, score = 200 // bf???????? | // eb19 | jmp 0x1b // 6a0d | push 0xd // 5d | pop ebp // 68???????? | $sequence_8 = { 6a00 ff35???????? ffd6 53 8bf0 } // n = 5, score = 200 // 6a00 | push 0 // ff35???????? | // ffd6 | call esi // 53 | push ebx // 8bf0 | mov esi, eax $sequence_9 = { 53 a3???????? ff15???????? a3???????? 3bc3 7505 6a02 } // n = 7, score = 200 // 53 | push ebx // a3???????? | // ff15???????? | // a3???????? | // 3bc3 | cmp eax, ebx // 7505 | jne 7 // 6a02 | push 2 condition: 7 of them and filesize < 188416 }
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