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rule win_rustock_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.rustock." 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.rustock" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 21d0 83e100 85c9 7506 68db030100 c3 } // n = 6, score = 100 // 21d0 | and eax, edx // 83e100 | and ecx, 0 // 85c9 | test ecx, ecx // 7506 | jne 8 // 68db030100 | push 0x103db // c3 | ret $sequence_1 = { 85f6 7467 c745dc01000000 53 56 ff7510 ff750c } // n = 7, score = 100 // 85f6 | test esi, esi // 7467 | je 0x69 // c745dc01000000 | mov dword ptr [ebp - 0x24], 1 // 53 | push ebx // 56 | push esi // ff7510 | push dword ptr [ebp + 0x10] // ff750c | push dword ptr [ebp + 0xc] $sequence_2 = { e8???????? 85c0 7420 8d85fcfeffff 50 56 } // n = 6, score = 100 // e8???????? | // 85c0 | test eax, eax // 7420 | je 0x22 // 8d85fcfeffff | lea eax, [ebp - 0x104] // 50 | push eax // 56 | push esi $sequence_3 = { ff15???????? cc a1???????? 85c0 7402 ffd0 56 } // n = 7, score = 100 // ff15???????? | // cc | int3 // a1???????? | // 85c0 | test eax, eax // 7402 | je 4 // ffd0 | call eax // 56 | push esi $sequence_4 = { 7404 802700 47 ff06 8b5d0c } // n = 5, score = 100 // 7404 | je 6 // 802700 | and byte ptr [edi], 0 // 47 | inc edi // ff06 | inc dword ptr [esi] // 8b5d0c | mov ebx, dword ptr [ebp + 0xc] $sequence_5 = { 8d85fcfeffff 50 ff7508 ff15???????? 85c0 6a04 6a00 } // n = 7, score = 100 // 8d85fcfeffff | lea eax, [ebp - 0x104] // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 85c0 | test eax, eax // 6a04 | push 4 // 6a00 | push 0 $sequence_6 = { 895dbc 8bcf 33c0 8bfb 8bd1 c1e902 } // n = 6, score = 100 // 895dbc | mov dword ptr [ebp - 0x44], ebx // 8bcf | mov ecx, edi // 33c0 | xor eax, eax // 8bfb | mov edi, ebx // 8bd1 | mov edx, ecx // c1e902 | shr ecx, 2 $sequence_7 = { 8bf8 ff550c 68c5030000 8bd8 ff550c } // n = 5, score = 100 // 8bf8 | mov edi, eax // ff550c | call dword ptr [ebp + 0xc] // 68c5030000 | push 0x3c5 // 8bd8 | mov ebx, eax // ff550c | call dword ptr [ebp + 0xc] $sequence_8 = { 53 ff15???????? 8d65ac 5f 5e 5b } // n = 6, score = 100 // 53 | push ebx // ff15???????? | // 8d65ac | lea esp, [ebp - 0x54] // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_9 = { 8975c0 85f6 0f848b000000 8365fc00 83c003 83e0fc e8???????? } // n = 7, score = 100 // 8975c0 | mov dword ptr [ebp - 0x40], esi // 85f6 | test esi, esi // 0f848b000000 | je 0x91 // 8365fc00 | and dword ptr [ebp - 4], 0 // 83c003 | add eax, 3 // 83e0fc | and eax, 0xfffffffc // e8???????? | condition: 7 of them and filesize < 565248 }
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