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rule win_ruckguv_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.ruckguv." 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.ruckguv" 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 = { 7403 51 eb04 0fb7c0 50 ff7508 } // n = 6, score = 200 // 7403 | je 5 // 51 | push ecx // eb04 | jmp 6 // 0fb7c0 | movzx eax, ax // 50 | push eax // ff7508 | push dword ptr [ebp + 8] $sequence_1 = { 56 53 e8???????? 8b463c 68f8000000 } // n = 5, score = 200 // 56 | push esi // 53 | push ebx // e8???????? | // 8b463c | mov eax, dword ptr [esi + 0x3c] // 68f8000000 | push 0xf8 $sequence_2 = { ff75fc 8d85b0f7ffff 50 ff75f4 } // n = 4, score = 200 // ff75fc | push dword ptr [ebp - 4] // 8d85b0f7ffff | lea eax, [ebp - 0x850] // 50 | push eax // ff75f4 | push dword ptr [ebp - 0xc] $sequence_3 = { 59 894508 85c0 750f 8b470c } // n = 5, score = 200 // 59 | pop ecx // 894508 | mov dword ptr [ebp + 8], eax // 85c0 | test eax, eax // 750f | jne 0x11 // 8b470c | mov eax, dword ptr [edi + 0xc] $sequence_4 = { 85c0 0f848b000000 57 8d3c18 8b470c 85c0 } // n = 6, score = 200 // 85c0 | test eax, eax // 0f848b000000 | je 0x91 // 57 | push edi // 8d3c18 | lea edi, [eax + ebx] // 8b470c | mov eax, dword ptr [edi + 0xc] // 85c0 | test eax, eax $sequence_5 = { 8a0a 84c9 75f1 c3 682680acc8 } // n = 5, score = 200 // 8a0a | mov cl, byte ptr [edx] // 84c9 | test cl, cl // 75f1 | jne 0xfffffff3 // c3 | ret // 682680acc8 | push 0xc8ac8026 $sequence_6 = { 83c0c0 50 8d4640 50 8d4340 } // n = 5, score = 200 // 83c0c0 | add eax, -0x40 // 50 | push eax // 8d4640 | lea eax, [esi + 0x40] // 50 | push eax // 8d4340 | lea eax, [ebx + 0x40] $sequence_7 = { 68dff0f081 6a01 e8???????? 83c40c 8d8d9cfdffff 51 ffd0 } // n = 7, score = 200 // 68dff0f081 | push 0x81f0f0df // 6a01 | push 1 // e8???????? | // 83c40c | add esp, 0xc // 8d8d9cfdffff | lea ecx, [ebp - 0x264] // 51 | push ecx // ffd0 | call eax $sequence_8 = { 6880000000 6a03 56 56 53 } // n = 5, score = 200 // 6880000000 | push 0x80 // 6a03 | push 3 // 56 | push esi // 56 | push esi // 53 | push ebx $sequence_9 = { 59 59 ff742404 ffd0 c3 6831f478b7 } // n = 6, score = 200 // 59 | pop ecx // 59 | pop ecx // ff742404 | push dword ptr [esp + 4] // ffd0 | call eax // c3 | ret // 6831f478b7 | push 0xb778f431 condition: 7 of them and filesize < 41024 }
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