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rule win_snifula_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "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 = { 83ec10 834dfcff 56 8b7508 8b4604 8b4e10 8945f4 } // n = 7, score = 200 // 83ec10 | sub esp, 0x10 // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 8b4604 | mov eax, dword ptr [esi + 4] // 8b4e10 | mov ecx, dword ptr [esi + 0x10] // 8945f4 | mov dword ptr [ebp - 0xc], eax $sequence_1 = { e8???????? ebc9 6aff 6a00 8d45f8 50 6a02 } // n = 7, score = 200 // e8???????? | // ebc9 | jmp 0xffffffcb // 6aff | push -1 // 6a00 | push 0 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 6a02 | push 2 $sequence_2 = { 33c0 e9???????? 8d4540 50 3bfb 7404 } // n = 6, score = 200 // 33c0 | xor eax, eax // e9???????? | // 8d4540 | lea eax, [ebp + 0x40] // 50 | push eax // 3bfb | cmp edi, ebx // 7404 | je 6 $sequence_3 = { c20c00 56 ff742408 ff15???????? 83c003 50 6a40 } // n = 7, score = 200 // c20c00 | ret 0xc // 56 | push esi // ff742408 | push dword ptr [esp + 8] // ff15???????? | // 83c003 | add eax, 3 // 50 | push eax // 6a40 | push 0x40 $sequence_4 = { ff7508 e8???????? 8945e4 85c0 741c 3945fc 7517 } // n = 7, score = 200 // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 85c0 | test eax, eax // 741c | je 0x1e // 3945fc | cmp dword ptr [ebp - 4], eax // 7517 | jne 0x19 $sequence_5 = { 85ff 742d 56 ff7508 6a00 6800040000 ff15???????? } // n = 7, score = 200 // 85ff | test edi, edi // 742d | je 0x2f // 56 | push esi // ff7508 | push dword ptr [ebp + 8] // 6a00 | push 0 // 6800040000 | push 0x400 // ff15???????? | $sequence_6 = { eb10 c68565ffffff04 eb07 c68565ffffff07 6a00 ff7578 } // n = 6, score = 200 // eb10 | jmp 0x12 // c68565ffffff04 | mov byte ptr [ebp - 0x9b], 4 // eb07 | jmp 9 // c68565ffffff07 | mov byte ptr [ebp - 0x9b], 7 // 6a00 | push 0 // ff7578 | push dword ptr [ebp + 0x78] $sequence_7 = { ff15???????? 85c0 7517 68???????? ff74241c ff15???????? } // n = 6, score = 200 // ff15???????? | // 85c0 | test eax, eax // 7517 | jne 0x19 // 68???????? | // ff74241c | push dword ptr [esp + 0x1c] // ff15???????? | $sequence_8 = { 8d0446 50 53 ff15???????? eb05 33c0 668903 } // n = 7, score = 200 // 8d0446 | lea eax, [esi + eax*2] // 50 | push eax // 53 | push ebx // ff15???????? | // eb05 | jmp 7 // 33c0 | xor eax, eax // 668903 | mov word ptr [ebx], ax $sequence_9 = { 6a02 ffd3 85c0 74b9 5e 8b4f28 } // n = 6, score = 200 // 6a02 | push 2 // ffd3 | call ebx // 85c0 | test eax, eax // 74b9 | je 0xffffffbb // 5e | pop esi // 8b4f28 | mov ecx, dword ptr [edi + 0x28] condition: 7 of them and filesize < 188416 }
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