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rule win_netkey_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.netkey." 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.netkey" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8a4508 33ff c745fc00000000 8bcb } // n = 4, score = 200 // 8a4508 | mov al, byte ptr [ebp + 8] // 33ff | xor edi, edi // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8bcb | mov ecx, ebx $sequence_1 = { 85c0 74ea 56 53 8d4728 899f2c200300 50 } // n = 7, score = 200 // 85c0 | test eax, eax // 74ea | je 0xffffffec // 56 | push esi // 53 | push ebx // 8d4728 | lea eax, [edi + 0x28] // 899f2c200300 | mov dword ptr [edi + 0x3202c], ebx // 50 | push eax $sequence_2 = { 83e13f c1f806 6bc930 8855d4 8b0485a8214400 88540828 8b0b } // n = 7, score = 200 // 83e13f | and ecx, 0x3f // c1f806 | sar eax, 6 // 6bc930 | imul ecx, ecx, 0x30 // 8855d4 | mov byte ptr [ebp - 0x2c], dl // 8b0485a8214400 | mov eax, dword ptr [eax*4 + 0x4421a8] // 88540828 | mov byte ptr [eax + ecx + 0x28], dl // 8b0b | mov ecx, dword ptr [ebx] $sequence_3 = { 741c 85db 7507 c74634142f4300 } // n = 4, score = 200 // 741c | je 0x1e // 85db | test ebx, ebx // 7507 | jne 9 // c74634142f4300 | mov dword ptr [esi + 0x34], 0x432f14 $sequence_4 = { e9???????? c745e0f4514300 e9???????? c745e00c524300 e9???????? c745e074534300 e9???????? } // n = 7, score = 200 // e9???????? | // c745e0f4514300 | mov dword ptr [ebp - 0x20], 0x4351f4 // e9???????? | // c745e00c524300 | mov dword ptr [ebp - 0x20], 0x43520c // e9???????? | // c745e074534300 | mov dword ptr [ebp - 0x20], 0x435374 // e9???????? | $sequence_5 = { c1fa06 6bc830 8b0495a8214400 8a440828 a848 7404 33c0 } // n = 7, score = 200 // c1fa06 | sar edx, 6 // 6bc830 | imul ecx, eax, 0x30 // 8b0495a8214400 | mov eax, dword ptr [edx*4 + 0x4421a8] // 8a440828 | mov al, byte ptr [eax + ecx + 0x28] // a848 | test al, 0x48 // 7404 | je 6 // 33c0 | xor eax, eax $sequence_6 = { 6a0a 57 56 50 e8???????? 8bcf } // n = 6, score = 200 // 6a0a | push 0xa // 57 | push edi // 56 | push esi // 50 | push eax // e8???????? | // 8bcf | mov ecx, edi $sequence_7 = { 8b4514 40 c745ec47f04000 894df8 8945fc 64a100000000 8945e8 } // n = 7, score = 200 // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 40 | inc eax // c745ec47f04000 | mov dword ptr [ebp - 0x14], 0x40f047 // 894df8 | mov dword ptr [ebp - 8], ecx // 8945fc | mov dword ptr [ebp - 4], eax // 64a100000000 | mov eax, dword ptr fs:[0] // 8945e8 | mov dword ptr [ebp - 0x18], eax $sequence_8 = { 8bf8 83c424 85ff 751c 8b45f0 } // n = 5, score = 200 // 8bf8 | mov edi, eax // 83c424 | add esp, 0x24 // 85ff | test edi, edi // 751c | jne 0x1e // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_9 = { 0fb701 8d4902 6689440ffe 6685c0 75f0 8b4dfc b801000000 } // n = 7, score = 200 // 0fb701 | movzx eax, word ptr [ecx] // 8d4902 | lea ecx, [ecx + 2] // 6689440ffe | mov word ptr [edi + ecx - 2], ax // 6685c0 | test ax, ax // 75f0 | jne 0xfffffff2 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // b801000000 | mov eax, 1 condition: 7 of them and filesize < 606208 }
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