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rule win_rover_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.rover." 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.rover" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 50 e8???????? 8b442430 8b542458 2beb 8d4c2801 8b44243c } // n = 7, score = 100 // 50 | push eax // e8???????? | // 8b442430 | mov eax, dword ptr [esp + 0x30] // 8b542458 | mov edx, dword ptr [esp + 0x58] // 2beb | sub ebp, ebx // 8d4c2801 | lea ecx, [eax + ebp + 1] // 8b44243c | mov eax, dword ptr [esp + 0x3c] $sequence_1 = { 8b742418 8d5001 8911 83c104 894c242c 803800 0f8549fcffff } // n = 7, score = 100 // 8b742418 | mov esi, dword ptr [esp + 0x18] // 8d5001 | lea edx, [eax + 1] // 8911 | mov dword ptr [ecx], edx // 83c104 | add ecx, 4 // 894c242c | mov dword ptr [esp + 0x2c], ecx // 803800 | cmp byte ptr [eax], 0 // 0f8549fcffff | jne 0xfffffc4f $sequence_2 = { 50 8d8c2480000000 ff15???????? 50 8d4c2478 c68424e009000003 ff15???????? } // n = 7, score = 100 // 50 | push eax // 8d8c2480000000 | lea ecx, [esp + 0x80] // ff15???????? | // 50 | push eax // 8d4c2478 | lea ecx, [esp + 0x78] // c68424e009000003 | mov byte ptr [esp + 0x9e0], 3 // ff15???????? | $sequence_3 = { 83fe63 750a 68???????? e9???????? 83fe64 750f 68???????? } // n = 7, score = 100 // 83fe63 | cmp esi, 0x63 // 750a | jne 0xc // 68???????? | // e9???????? | // 83fe64 | cmp esi, 0x64 // 750f | jne 0x11 // 68???????? | $sequence_4 = { 837e1400 7423 8bc6 e8???????? 8bf8 85ff 7431 } // n = 7, score = 100 // 837e1400 | cmp dword ptr [esi + 0x14], 0 // 7423 | je 0x25 // 8bc6 | mov eax, esi // e8???????? | // 8bf8 | mov edi, eax // 85ff | test edi, edi // 7431 | je 0x33 $sequence_5 = { 8bf0 85c0 746f 6a3f 50 ffd3 8bf8 } // n = 7, score = 100 // 8bf0 | mov esi, eax // 85c0 | test eax, eax // 746f | je 0x71 // 6a3f | push 0x3f // 50 | push eax // ffd3 | call ebx // 8bf8 | mov edi, eax $sequence_6 = { 50 51 ffd5 8b4c241c 83c40c 3b4c2414 7409 } // n = 7, score = 100 // 50 | push eax // 51 | push ecx // ffd5 | call ebp // 8b4c241c | mov ecx, dword ptr [esp + 0x1c] // 83c40c | add esp, 0xc // 3b4c2414 | cmp ecx, dword ptr [esp + 0x14] // 7409 | je 0xb $sequence_7 = { eb7c 8bd5 0b542414 744c 55 68???????? 53 } // n = 7, score = 100 // eb7c | jmp 0x7e // 8bd5 | mov edx, ebp // 0b542414 | or edx, dword ptr [esp + 0x14] // 744c | je 0x4e // 55 | push ebp // 68???????? | // 53 | push ebx $sequence_8 = { 81ec14010000 a1???????? 33c4 89842410010000 56 57 6803010000 } // n = 7, score = 100 // 81ec14010000 | sub esp, 0x114 // a1???????? | // 33c4 | xor eax, esp // 89842410010000 | mov dword ptr [esp + 0x110], eax // 56 | push esi // 57 | push edi // 6803010000 | push 0x103 $sequence_9 = { 894c2458 8954245c e8???????? 8bf0 8bfa 83feff 7451 } // n = 7, score = 100 // 894c2458 | mov dword ptr [esp + 0x58], ecx // 8954245c | mov dword ptr [esp + 0x5c], edx // e8???????? | // 8bf0 | mov esi, eax // 8bfa | mov edi, edx // 83feff | cmp esi, -1 // 7451 | je 0x53 condition: 7 of them and filesize < 704512 }
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