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rule win_netkey_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 6a00 50 8b4604 038528fdffff 50 8b46fc 038524fdffff } // n = 7, score = 200 // 6a00 | push 0 // 50 | push eax // 8b4604 | mov eax, dword ptr [esi + 4] // 038528fdffff | add eax, dword ptr [ebp - 0x2d8] // 50 | push eax // 8b46fc | mov eax, dword ptr [esi - 4] // 038524fdffff | add eax, dword ptr [ebp - 0x2dc] $sequence_1 = { f30f7e05???????? 660fd6444e10 a1???????? 89444e18 ff15???????? 8bd8 85db } // n = 7, score = 200 // f30f7e05???????? | // 660fd6444e10 | movq qword ptr [esi + ecx*2 + 0x10], xmm0 // a1???????? | // 89444e18 | mov dword ptr [esi + ecx*2 + 0x18], eax // ff15???????? | // 8bd8 | mov ebx, eax // 85db | test ebx, ebx $sequence_2 = { 8945f8 53 56 57 8bf9 8995e0feffff 83ffff } // n = 7, score = 200 // 8945f8 | mov dword ptr [ebp - 8], eax // 53 | push ebx // 56 | push esi // 57 | push edi // 8bf9 | mov edi, ecx // 8995e0feffff | mov dword ptr [ebp - 0x120], edx // 83ffff | cmp edi, -1 $sequence_3 = { b802000000 53 668945d8 ff15???????? 8b3d???????? 668945da } // n = 6, score = 200 // b802000000 | mov eax, 2 // 53 | push ebx // 668945d8 | mov word ptr [ebp - 0x28], ax // ff15???????? | // 8b3d???????? | // 668945da | mov word ptr [ebp - 0x26], ax $sequence_4 = { 57 33c0 8d3c9d241d4400 f00fb10f 8bc8 85c9 } // n = 6, score = 200 // 57 | push edi // 33c0 | xor eax, eax // 8d3c9d241d4400 | lea edi, [ebx*4 + 0x441d24] // f00fb10f | lock cmpxchg dword ptr [edi], ecx // 8bc8 | mov ecx, eax // 85c9 | test ecx, ecx $sequence_5 = { 8985dcfdffff 8b85ecfdffff 6a10 8985e0fdffff 8d85d8fdffff 50 6a00 } // n = 7, score = 200 // 8985dcfdffff | mov dword ptr [ebp - 0x224], eax // 8b85ecfdffff | mov eax, dword ptr [ebp - 0x214] // 6a10 | push 0x10 // 8985e0fdffff | mov dword ptr [ebp - 0x220], eax // 8d85d8fdffff | lea eax, [ebp - 0x228] // 50 | push eax // 6a00 | push 0 $sequence_6 = { 2bca 51 57 8d4b18 e8???????? 57 } // n = 6, score = 200 // 2bca | sub ecx, edx // 51 | push ecx // 57 | push edi // 8d4b18 | lea ecx, [ebx + 0x18] // e8???????? | // 57 | push edi $sequence_7 = { 750b 8a45fb 88043e 46 } // n = 4, score = 200 // 750b | jne 0xd // 8a45fb | mov al, byte ptr [ebp - 5] // 88043e | mov byte ptr [esi + edi], al // 46 | inc esi $sequence_8 = { 83c0fc 50 e8???????? 8b8db4efffff } // n = 4, score = 200 // 83c0fc | add eax, -4 // 50 | push eax // e8???????? | // 8b8db4efffff | mov ecx, dword ptr [ebp - 0x104c] $sequence_9 = { e8???????? 83c404 8d85f0efffff 50 6800040000 } // n = 5, score = 200 // e8???????? | // 83c404 | add esp, 4 // 8d85f0efffff | lea eax, [ebp - 0x1010] // 50 | push eax // 6800040000 | push 0x400 condition: 7 of them and filesize < 606208 }
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