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rule win_rustock_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8b0d???????? 83f901 0f8452010000 85c9 750d 833d????????01 } // n = 6, score = 100 // 8b0d???????? | // 83f901 | cmp ecx, 1 // 0f8452010000 | je 0x158 // 85c9 | test ecx, ecx // 750d | jne 0xf // 833d????????01 | $sequence_1 = { ff15???????? 8bd0 85d2 752a 833d????????00 7421 } // n = 6, score = 100 // ff15???????? | // 8bd0 | mov edx, eax // 85d2 | test edx, edx // 752a | jne 0x2c // 833d????????00 | // 7421 | je 0x23 $sequence_2 = { 95 363289b00d9930 dfa3c37603c0 8a4754 a4 3de8e924c9 1e } // n = 7, score = 100 // 95 | xchg eax, ebp // 363289b00d9930 | xor cl, byte ptr ss:[ecx + 0x30990db0] // dfa3c37603c0 | fbld tbyte ptr [ebx - 0x3ffc893d] // 8a4754 | mov al, byte ptr [edi + 0x54] // a4 | movsb byte ptr es:[edi], byte ptr [esi] // 3de8e924c9 | cmp eax, 0xc924e9e8 // 1e | push ds $sequence_3 = { 59 8bc7 e9???????? 897dcc } // n = 4, score = 100 // 59 | pop ecx // 8bc7 | mov eax, edi // e9???????? | // 897dcc | mov dword ptr [ebp - 0x34], edi $sequence_4 = { 3b4520 0f84fa000000 57 57 8d4d14 } // n = 5, score = 100 // 3b4520 | cmp eax, dword ptr [ebp + 0x20] // 0f84fa000000 | je 0x100 // 57 | push edi // 57 | push edi // 8d4d14 | lea ecx, [ebp + 0x14] $sequence_5 = { 59 01fb 8d08 31f0 be948b0100 68d44f0100 59 } // n = 7, score = 100 // 59 | pop ecx // 01fb | add ebx, edi // 8d08 | lea ecx, [eax] // 31f0 | xor eax, esi // be948b0100 | mov esi, 0x18b94 // 68d44f0100 | push 0x14fd4 // 59 | pop ecx $sequence_6 = { 31d7 21d1 033d???????? 8d3c3f 8b0d???????? 09fe f7d1 } // n = 7, score = 100 // 31d7 | xor edi, edx // 21d1 | and ecx, edx // 033d???????? | // 8d3c3f | lea edi, [edi + edi] // 8b0d???????? | // 09fe | or esi, edi // f7d1 | not ecx $sequence_7 = { 6a01 e8???????? 59 59 8945e4 3bc7 7434 } // n = 7, score = 100 // 6a01 | push 1 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 3bc7 | cmp eax, edi // 7434 | je 0x36 $sequence_8 = { 8b0d???????? 29c9 29ce 29f9 } // n = 4, score = 100 // 8b0d???????? | // 29c9 | sub ecx, ecx // 29ce | sub esi, ecx // 29f9 | sub ecx, edi $sequence_9 = { 897d0c 7415 8b0b 83c104 8bc1 } // n = 5, score = 100 // 897d0c | mov dword ptr [ebp + 0xc], edi // 7415 | je 0x17 // 8b0b | mov ecx, dword ptr [ebx] // 83c104 | add ecx, 4 // 8bc1 | mov eax, ecx condition: 7 of them and filesize < 565248 }
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