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rule win_ruckguv_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 57 6a06 e8???????? be00080000 eb38 53 8d45f0 } // n = 7, score = 200 // 57 | push edi // 6a06 | push 6 // e8???????? | // be00080000 | mov esi, 0x800 // eb38 | jmp 0x3a // 53 | push ebx // 8d45f0 | lea eax, dword ptr [ebp - 0x10] $sequence_1 = { 53 8b5d08 8b433c 03c3 8b8080000000 85c0 } // n = 6, score = 200 // 53 | push ebx // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8b433c | mov eax, dword ptr [ebx + 0x3c] // 03c3 | add eax, ebx // 8b8080000000 | mov eax, dword ptr [eax + 0x80] // 85c0 | test eax, eax $sequence_2 = { 8345fc04 833e00 75bd 8b4720 83c714 85c0 7583 } // n = 7, score = 200 // 8345fc04 | add dword ptr [ebp - 4], 4 // 833e00 | cmp dword ptr [esi], 0 // 75bd | jne 0xffffffbf // 8b4720 | mov eax, dword ptr [edi + 0x20] // 83c714 | add edi, 0x14 // 85c0 | test eax, eax // 7583 | jne 0xffffff85 $sequence_3 = { 57 8d3c18 8b470c 85c0 747f 56 } // n = 6, score = 200 // 57 | push edi // 8d3c18 | lea edi, dword ptr [eax + ebx] // 8b470c | mov eax, dword ptr [edi + 0xc] // 85c0 | test eax, eax // 747f | je 0x81 // 56 | push esi $sequence_4 = { fe45ff 881e 8810 660fb645ff 663b450c 7504 } // n = 6, score = 200 // fe45ff | inc byte ptr [ebp - 1] // 881e | mov byte ptr [esi], bl // 8810 | mov byte ptr [eax], dl // 660fb645ff | movzx ax, byte ptr [ebp - 1] // 663b450c | cmp ax, word ptr [ebp + 0xc] // 7504 | jne 6 $sequence_5 = { 03c3 50 e8???????? 59 894508 85c0 } // n = 6, score = 200 // 03c3 | add eax, ebx // 50 | push eax // e8???????? | // 59 | pop ecx // 894508 | mov dword ptr [ebp + 8], eax // 85c0 | test eax, eax $sequence_6 = { 8a4dff 888801010000 5f c9 c3 } // n = 5, score = 200 // 8a4dff | mov cl, byte ptr [ebp - 1] // 888801010000 | mov byte ptr [eax + 0x101], cl // 5f | pop edi // c9 | leave // c3 | ret $sequence_7 = { 51 03c3 50 e8???????? 0fb74706 83c40c } // n = 6, score = 200 // 51 | push ecx // 03c3 | add eax, ebx // 50 | push eax // e8???????? | // 0fb74706 | movzx eax, word ptr [edi + 6] // 83c40c | add esp, 0xc $sequence_8 = { 8d8594fbffff 50 8d858cf9ffff 68???????? } // n = 4, score = 200 // 8d8594fbffff | lea eax, dword ptr [ebp - 0x46c] // 50 | push eax // 8d858cf9ffff | lea eax, dword ptr [ebp - 0x674] // 68???????? | $sequence_9 = { 83650800 33c0 663b4706 733c 8b4df8 eb03 } // n = 6, score = 200 // 83650800 | and dword ptr [ebp + 8], 0 // 33c0 | xor eax, eax // 663b4706 | cmp ax, word ptr [edi + 6] // 733c | jae 0x3e // 8b4df8 | mov ecx, dword ptr [ebp - 8] // eb03 | jmp 5 condition: 7 of them and filesize < 41024 }
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