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rule win_rover_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 897e1c 897e18 897e10 897e08 897e04 897e0c 897e14 } // n = 7, score = 100 // 897e1c | mov dword ptr [esi + 0x1c], edi // 897e18 | mov dword ptr [esi + 0x18], edi // 897e10 | mov dword ptr [esi + 0x10], edi // 897e08 | mov dword ptr [esi + 8], edi // 897e04 | mov dword ptr [esi + 4], edi // 897e0c | mov dword ptr [esi + 0xc], edi // 897e14 | mov dword ptr [esi + 0x14], edi $sequence_1 = { 8b542414 56 68???????? 52 e8???????? 53 ff15???????? } // n = 7, score = 100 // 8b542414 | mov edx, dword ptr [esp + 0x14] // 56 | push esi // 68???????? | // 52 | push edx // e8???????? | // 53 | push ebx // ff15???????? | $sequence_2 = { 8bf0 a1???????? 8b4810 8d542438 52 ffd1 } // n = 6, score = 100 // 8bf0 | mov esi, eax // a1???????? | // 8b4810 | mov ecx, dword ptr [eax + 0x10] // 8d542438 | lea edx, [esp + 0x38] // 52 | push edx // ffd1 | call ecx $sequence_3 = { 8d54247c 52 50 e8???????? 83c408 85c0 0f85bc010000 } // n = 7, score = 100 // 8d54247c | lea edx, [esp + 0x7c] // 52 | push edx // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax // 0f85bc010000 | jne 0x1c2 $sequence_4 = { eba5 6800010000 8d8c24b4000000 51 55 e8???????? 83c40c } // n = 7, score = 100 // eba5 | jmp 0xffffffa7 // 6800010000 | push 0x100 // 8d8c24b4000000 | lea ecx, [esp + 0xb4] // 51 | push ecx // 55 | push ebp // e8???????? | // 83c40c | add esp, 0xc $sequence_5 = { 83c40c 8d4d88 885dfc ff15???????? 8b0d???????? 68???????? 51 } // n = 7, score = 100 // 83c40c | add esp, 0xc // 8d4d88 | lea ecx, [ebp - 0x78] // 885dfc | mov byte ptr [ebp - 4], bl // ff15???????? | // 8b0d???????? | // 68???????? | // 51 | push ecx $sequence_6 = { 8d7c2440 e8???????? 8bf0 8d8c24cc000000 51 8d542460 68???????? } // n = 7, score = 100 // 8d7c2440 | lea edi, [esp + 0x40] // e8???????? | // 8bf0 | mov esi, eax // 8d8c24cc000000 | lea ecx, [esp + 0xcc] // 51 | push ecx // 8d542460 | lea edx, [esp + 0x60] // 68???????? | $sequence_7 = { 0fb7442418 e9???????? 8bf3 eb49 0fb7442430 6801040000 } // n = 6, score = 100 // 0fb7442418 | movzx eax, word ptr [esp + 0x18] // e9???????? | // 8bf3 | mov esi, ebx // eb49 | jmp 0x4b // 0fb7442430 | movzx eax, word ptr [esp + 0x30] // 6801040000 | push 0x401 $sequence_8 = { 3bf0 7629 8b442428 5f 5e 5d c700ffffff7f } // n = 7, score = 100 // 3bf0 | cmp esi, eax // 7629 | jbe 0x2b // 8b442428 | mov eax, dword ptr [esp + 0x28] // 5f | pop edi // 5e | pop esi // 5d | pop ebp // c700ffffff7f | mov dword ptr [eax], 0x7fffffff $sequence_9 = { b855000000 5b 83c438 c3 68???????? 57 e8???????? } // n = 7, score = 100 // b855000000 | mov eax, 0x55 // 5b | pop ebx // 83c438 | add esp, 0x38 // c3 | ret // 68???????? | // 57 | push edi // e8???????? | condition: 7 of them and filesize < 704512 }
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