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rule win_sneepy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.sneepy." 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.sneepy" 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 = { 8b048560314100 83e61f c1e606 8d443004 8020fd 8b45f8 8b55fc } // n = 7, score = 100 // 8b048560314100 | mov eax, dword ptr [eax*4 + 0x413160] // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 8d443004 | lea eax, [eax + esi + 4] // 8020fd | and byte ptr [eax], 0xfd // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b55fc | mov edx, dword ptr [ebp - 4] $sequence_1 = { c3 8bff 56 57 33ff ffb788164100 ff15???????? } // n = 7, score = 100 // c3 | ret // 8bff | mov edi, edi // 56 | push esi // 57 | push edi // 33ff | xor edi, edi // ffb788164100 | push dword ptr [edi + 0x411688] // ff15???????? | $sequence_2 = { 68???????? e8???????? 6804010000 8d85ecfbffff 6a00 } // n = 5, score = 100 // 68???????? | // e8???????? | // 6804010000 | push 0x104 // 8d85ecfbffff | lea eax, [ebp - 0x414] // 6a00 | push 0 $sequence_3 = { ffd6 85c0 7414 53 ffd6 85c0 740d } // n = 7, score = 100 // ffd6 | call esi // 85c0 | test eax, eax // 7414 | je 0x16 // 53 | push ebx // ffd6 | call esi // 85c0 | test eax, eax // 740d | je 0xf $sequence_4 = { 6a00 68ff000000 8d95acfcffff 52 50 } // n = 5, score = 100 // 6a00 | push 0 // 68ff000000 | push 0xff // 8d95acfcffff | lea edx, [ebp - 0x354] // 52 | push edx // 50 | push eax $sequence_5 = { 8b3d???????? 8d8dc0feffff 51 6a32 8d55c8 52 } // n = 6, score = 100 // 8b3d???????? | // 8d8dc0feffff | lea ecx, [ebp - 0x140] // 51 | push ecx // 6a32 | push 0x32 // 8d55c8 | lea edx, [ebp - 0x38] // 52 | push edx $sequence_6 = { 7524 818dc4feffff80f10000 6a04 8d8dc4feffff 51 } // n = 5, score = 100 // 7524 | jne 0x26 // 818dc4feffff80f10000 | or dword ptr [ebp - 0x13c], 0xf180 // 6a04 | push 4 // 8d8dc4feffff | lea ecx, [ebp - 0x13c] // 51 | push ecx $sequence_7 = { 33c0 8b4d08 3b0cc520de4000 740a 40 83f816 72ee } // n = 7, score = 100 // 33c0 | xor eax, eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 3b0cc520de4000 | cmp ecx, dword ptr [eax*8 + 0x40de20] // 740a | je 0xc // 40 | inc eax // 83f816 | cmp eax, 0x16 // 72ee | jb 0xfffffff0 $sequence_8 = { a1???????? 6a00 6a07 68???????? } // n = 4, score = 100 // a1???????? | // 6a00 | push 0 // 6a07 | push 7 // 68???????? | $sequence_9 = { 7518 56 e8???????? 8b55fc 52 e8???????? } // n = 6, score = 100 // 7518 | jne 0x1a // 56 | push esi // e8???????? | // 8b55fc | mov edx, dword ptr [ebp - 4] // 52 | push edx // e8???????? | condition: 7 of them and filesize < 188416 }
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