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rule win_unidentified_071_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.unidentified_071." 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.unidentified_071" 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 = { c9 c20400 53 8b5c2408 55 8b6c2414 56 } // n = 7, score = 400 // c9 | leave // c20400 | ret 4 // 53 | push ebx // 8b5c2408 | mov ebx, dword ptr [esp + 8] // 55 | push ebp // 8b6c2414 | mov ebp, dword ptr [esp + 0x14] // 56 | push esi $sequence_1 = { 7474 40 50 8945f8 e8???????? 8bc8 } // n = 6, score = 400 // 7474 | je 0x76 // 40 | inc eax // 50 | push eax // 8945f8 | mov dword ptr [ebp - 8], eax // e8???????? | // 8bc8 | mov ecx, eax $sequence_2 = { c20400 53 8b5c240c 55 8b6c2418 56 8b742410 } // n = 7, score = 400 // c20400 | ret 4 // 53 | push ebx // 8b5c240c | mov ebx, dword ptr [esp + 0xc] // 55 | push ebp // 8b6c2418 | mov ebp, dword ptr [esp + 0x18] // 56 | push esi // 8b742410 | mov esi, dword ptr [esp + 0x10] $sequence_3 = { 8b44242c 8b742428 59 59 } // n = 4, score = 400 // 8b44242c | mov eax, dword ptr [esp + 0x2c] // 8b742428 | mov esi, dword ptr [esp + 0x28] // 59 | pop ecx // 59 | pop ecx $sequence_4 = { c9 c3 55 8b6c2408 56 8b742410 57 } // n = 7, score = 400 // c9 | leave // c3 | ret // 55 | push ebp // 8b6c2408 | mov ebp, dword ptr [esp + 8] // 56 | push esi // 8b742410 | mov esi, dword ptr [esp + 0x10] // 57 | push edi $sequence_5 = { 59 c3 8b0d???????? 53 8b1d???????? } // n = 5, score = 400 // 59 | pop ecx // c3 | ret // 8b0d???????? | // 53 | push ebx // 8b1d???????? | $sequence_6 = { c20400 8b542404 56 57 83ca07 bffeffff7f 3bd7 } // n = 7, score = 400 // c20400 | ret 4 // 8b542404 | mov edx, dword ptr [esp + 4] // 56 | push esi // 57 | push edi // 83ca07 | or edx, 7 // bffeffff7f | mov edi, 0x7ffffffe // 3bd7 | cmp edx, edi $sequence_7 = { 6b44242018 59 ff742420 89442418 03c7 8bc8 } // n = 6, score = 400 // 6b44242018 | imul eax, dword ptr [esp + 0x20], 0x18 // 59 | pop ecx // ff742420 | push dword ptr [esp + 0x20] // 89442418 | mov dword ptr [esp + 0x18], eax // 03c7 | add eax, edi // 8bc8 | mov ecx, eax $sequence_8 = { 66890e 85c0 75ec 8bc6 5e c3 8b5104 } // n = 7, score = 400 // 66890e | mov word ptr [esi], cx // 85c0 | test eax, eax // 75ec | jne 0xffffffee // 8bc6 | mov eax, esi // 5e | pop esi // c3 | ret // 8b5104 | mov edx, dword ptr [ecx + 4] $sequence_9 = { 55 e8???????? 33c0 83c410 6689042e 8b442414 83f808 } // n = 7, score = 400 // 55 | push ebp // e8???????? | // 33c0 | xor eax, eax // 83c410 | add esp, 0x10 // 6689042e | mov word ptr [esi + ebp], ax // 8b442414 | mov eax, dword ptr [esp + 0x14] // 83f808 | cmp eax, 8 condition: 7 of them and filesize < 1220608 }
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