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rule win_rustock_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8d6424fc 892c24 31ed 01e5 8d6424e4 50 } // n = 6, score = 100 // 8d6424fc | lea esp, [esp - 4] // 892c24 | mov dword ptr [esp], ebp // 31ed | xor ebp, ebp // 01e5 | add ebp, esp // 8d6424e4 | lea esp, [esp - 0x1c] // 50 | push eax $sequence_1 = { 031d???????? 21db 5e 5a } // n = 4, score = 100 // 031d???????? | // 21db | and ebx, ebx // 5e | pop esi // 5a | pop edx $sequence_2 = { 8bd8 85db 7439 8b4dc0 33c0 8bfb 8bd1 } // n = 7, score = 100 // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 7439 | je 0x3b // 8b4dc0 | mov ecx, dword ptr [ebp - 0x40] // 33c0 | xor eax, eax // 8bfb | mov edi, ebx // 8bd1 | mov edx, ecx $sequence_3 = { 83c604 56 53 ff15???????? 53 } // n = 5, score = 100 // 83c604 | add esi, 4 // 56 | push esi // 53 | push ebx // ff15???????? | // 53 | push ebx $sequence_4 = { 833d????????00 7421 56 e8???????? 85c0 59 75ac } // n = 7, score = 100 // 833d????????00 | // 7421 | je 0x23 // 56 | push esi // e8???????? | // 85c0 | test eax, eax // 59 | pop ecx // 75ac | jne 0xffffffae $sequence_5 = { 50 ff7520 e8???????? 83c418 8945cc 3bc7 74d4 } // n = 7, score = 100 // 50 | push eax // ff7520 | push dword ptr [ebp + 0x20] // e8???????? | // 83c418 | add esp, 0x18 // 8945cc | mov dword ptr [ebp - 0x34], eax // 3bc7 | cmp eax, edi // 74d4 | je 0xffffffd6 $sequence_6 = { ff750c e8???????? 68e8030000 ff15???????? e8???????? 8bf8 } // n = 6, score = 100 // ff750c | push dword ptr [ebp + 0xc] // e8???????? | // 68e8030000 | push 0x3e8 // ff15???????? | // e8???????? | // 8bf8 | mov edi, eax $sequence_7 = { 59 8945c4 83f8ff 7507 33c0 e9???????? 3b4520 } // n = 7, score = 100 // 59 | pop ecx // 8945c4 | mov dword ptr [ebp - 0x3c], eax // 83f8ff | cmp eax, -1 // 7507 | jne 9 // 33c0 | xor eax, eax // e9???????? | // 3b4520 | cmp eax, dword ptr [ebp + 0x20] $sequence_8 = { ebb5 7402 ebd3 8b1c24 68???????? } // n = 5, score = 100 // ebb5 | jmp 0xffffffb7 // 7402 | je 4 // ebd3 | jmp 0xffffffd5 // 8b1c24 | mov ebx, dword ptr [esp] // 68???????? | $sequence_9 = { 014514 a1???????? 83f802 0f84de010000 3bc7 } // n = 5, score = 100 // 014514 | add dword ptr [ebp + 0x14], eax // a1???????? | // 83f802 | cmp eax, 2 // 0f84de010000 | je 0x1e4 // 3bc7 | cmp eax, edi condition: 7 of them and filesize < 565248 }
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