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rule win_smanager_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.smanager" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 75ea 8b4dfc be04000000 03cb 2bf3 894dfc 85f6 } // n = 7, score = 100 // 75ea | jne 0xffffffec // 8b4dfc | mov ecx, dword ptr [ebp - 4] // be04000000 | mov esi, 4 // 03cb | add ecx, ebx // 2bf3 | sub esi, ebx // 894dfc | mov dword ptr [ebp - 4], ecx // 85f6 | test esi, esi $sequence_1 = { 83c404 ff75bc ff15???????? e9???????? c645fc01 } // n = 5, score = 100 // 83c404 | add esp, 4 // ff75bc | push dword ptr [ebp - 0x44] // ff15???????? | // e9???????? | // c645fc01 | mov byte ptr [ebp - 4], 1 $sequence_2 = { 8b08 8d55b0 52 8d55dc 52 } // n = 5, score = 100 // 8b08 | mov ecx, dword ptr [eax] // 8d55b0 | lea edx, [ebp - 0x50] // 52 | push edx // 8d55dc | lea edx, [ebp - 0x24] // 52 | push edx $sequence_3 = { 3d70001100 7430 3d78ba7c54 7554 85c9 7450 8b4510 } // n = 7, score = 100 // 3d70001100 | cmp eax, 0x110070 // 7430 | je 0x32 // 3d78ba7c54 | cmp eax, 0x547cba78 // 7554 | jne 0x56 // 85c9 | test ecx, ecx // 7450 | je 0x52 // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_4 = { 50 ff15???????? 6a2c e8???????? 8bf0 83c404 8bce } // n = 7, score = 100 // 50 | push eax // ff15???????? | // 6a2c | push 0x2c // e8???????? | // 8bf0 | mov esi, eax // 83c404 | add esp, 4 // 8bce | mov ecx, esi $sequence_5 = { 8bf8 83c102 51 6a00 57 e8???????? } // n = 6, score = 100 // 8bf8 | mov edi, eax // 83c102 | add ecx, 2 // 51 | push ecx // 6a00 | push 0 // 57 | push edi // e8???????? | $sequence_6 = { e8???????? 0f57c0 a3???????? 83c404 0f1100 0f114010 e8???????? } // n = 7, score = 100 // e8???????? | // 0f57c0 | xorps xmm0, xmm0 // a3???????? | // 83c404 | add esp, 4 // 0f1100 | movups xmmword ptr [eax], xmm0 // 0f114010 | movups xmmword ptr [eax + 0x10], xmm0 // e8???????? | $sequence_7 = { 81784808950210 7409 ff7048 e8???????? 59 c70701000000 8bcf } // n = 7, score = 100 // 81784808950210 | cmp dword ptr [eax + 0x48], 0x10029508 // 7409 | je 0xb // ff7048 | push dword ptr [eax + 0x48] // e8???????? | // 59 | pop ecx // c70701000000 | mov dword ptr [edi], 1 // 8bcf | mov ecx, edi $sequence_8 = { 8901 66c7400c0101 c3 55 8bec 6aff } // n = 6, score = 100 // 8901 | mov dword ptr [ecx], eax // 66c7400c0101 | mov word ptr [eax + 0xc], 0x101 // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 6aff | push -1 $sequence_9 = { 85ff 7515 33c0 5f 5e } // n = 5, score = 100 // 85ff | test edi, edi // 7515 | jne 0x17 // 33c0 | xor eax, eax // 5f | pop edi // 5e | pop esi condition: 7 of them and filesize < 398336 }
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