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rule win_sparrow_door_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.sparrow_door." 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.sparrow_door" 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 = { 51 c644245000 e8???????? 6803010000 8d942459010000 6a00 } // n = 6, score = 100 // 51 | push ecx // c644245000 | mov byte ptr [esp + 0x50], 0 // e8???????? | // 6803010000 | push 0x103 // 8d942459010000 | lea edx, dword ptr [esp + 0x159] // 6a00 | push 0 $sequence_1 = { 896c2448 c684249000000000 e8???????? 6882050000 8d9424d4000000 6a00 } // n = 6, score = 100 // 896c2448 | mov dword ptr [esp + 0x48], ebp // c684249000000000 | mov byte ptr [esp + 0x90], 0 // e8???????? | // 6882050000 | push 0x582 // 8d9424d4000000 | lea edx, dword ptr [esp + 0xd4] // 6a00 | push 0 $sequence_2 = { 53 6a01 52 ffd7 53 8d442418 50 } // n = 7, score = 100 // 53 | push ebx // 6a01 | push 1 // 52 | push edx // ffd7 | call edi // 53 | push ebx // 8d442418 | lea eax, dword ptr [esp + 0x18] // 50 | push eax $sequence_3 = { 33c9 3b04cd48e02a00 7413 41 } // n = 4, score = 100 // 33c9 | xor ecx, ecx // 3b04cd48e02a00 | cmp eax, dword ptr [ecx*8 + 0x2ae048] // 7413 | je 0x15 // 41 | inc ecx $sequence_4 = { 8b542418 e8???????? 8b442410 83c408 50 ff15???????? 53 } // n = 7, score = 100 // 8b542418 | mov edx, dword ptr [esp + 0x18] // e8???????? | // 8b442410 | mov eax, dword ptr [esp + 0x10] // 83c408 | add esp, 8 // 50 | push eax // ff15???????? | // 53 | push ebx $sequence_5 = { 897d00 e8???????? 8b742424 83c410 8d442450 50 } // n = 6, score = 100 // 897d00 | mov dword ptr [ebp], edi // e8???????? | // 8b742424 | mov esi, dword ptr [esp + 0x24] // 83c410 | add esp, 0x10 // 8d442450 | lea eax, dword ptr [esp + 0x50] // 50 | push eax $sequence_6 = { 83c408 c3 833d????????00 7505 e8???????? 8d3c1b 57 } // n = 7, score = 100 // 83c408 | add esp, 8 // c3 | ret // 833d????????00 | // 7505 | jne 7 // e8???????? | // 8d3c1b | lea edi, dword ptr [ebx + ebx] // 57 | push edi $sequence_7 = { 51 ffd6 8d94243e010000 52 8d8302010000 } // n = 5, score = 100 // 51 | push ecx // ffd6 | call esi // 8d94243e010000 | lea edx, dword ptr [esp + 0x13e] // 52 | push edx // 8d8302010000 | lea eax, dword ptr [ebx + 0x102] $sequence_8 = { 52 8bd8 8d042b 6a00 50 e8???????? 83c414 } // n = 7, score = 100 // 52 | push edx // 8bd8 | mov ebx, eax // 8d042b | lea eax, dword ptr [ebx + ebp] // 6a00 | push 0 // 50 | push eax // e8???????? | // 83c414 | add esp, 0x14 $sequence_9 = { 6689942454070000 e8???????? 83c40c 68e8030000 8d8c244c070000 51 } // n = 6, score = 100 // 6689942454070000 | mov word ptr [esp + 0x754], dx // e8???????? | // 83c40c | add esp, 0xc // 68e8030000 | push 0x3e8 // 8d8c244c070000 | lea ecx, dword ptr [esp + 0x74c] // 51 | push ecx condition: 7 of them and filesize < 155648 }
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