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rule win_unidentified_074_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.unidentified_074." 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_074" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 ffb578dfffff e8???????? 33c0 c7858cdfffff07000000 c78588dfffff00000000 66898578dfffff } // n = 7, score = 200 // 50 | push eax // ffb578dfffff | push dword ptr [ebp - 0x2088] // e8???????? | // 33c0 | xor eax, eax // c7858cdfffff07000000 | mov dword ptr [ebp - 0x2074], 7 // c78588dfffff00000000 | mov dword ptr [ebp - 0x2078], 0 // 66898578dfffff | mov word ptr [ebp - 0x2088], ax $sequence_1 = { 50 e8???????? 6aff 6a01 83ec08 c745fc00000000 8d4dd8 } // n = 7, score = 200 // 50 | push eax // e8???????? | // 6aff | push -1 // 6a01 | push 1 // 83ec08 | sub esp, 8 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8d4dd8 | lea ecx, [ebp - 0x28] $sequence_2 = { 3bc1 7432 8b4d08 8d041e 8a0408 3a02 7516 } // n = 7, score = 200 // 3bc1 | cmp eax, ecx // 7432 | je 0x34 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8d041e | lea eax, [esi + ebx] // 8a0408 | mov al, byte ptr [eax + ecx] // 3a02 | cmp al, byte ptr [edx] // 7516 | jne 0x18 $sequence_3 = { 50 ff15???????? 8bf0 85f6 0f84c4010000 837f1000 } // n = 6, score = 200 // 50 | push eax // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 0f84c4010000 | je 0x1ca // 837f1000 | cmp dword ptr [edi + 0x10], 0 $sequence_4 = { 50 899d6cdfffff c78568dfffff00000000 660fd645e4 e8???????? } // n = 5, score = 200 // 50 | push eax // 899d6cdfffff | mov dword ptr [ebp - 0x2094], ebx // c78568dfffff00000000 | mov dword ptr [ebp - 0x2098], 0 // 660fd645e4 | movq qword ptr [ebp - 0x1c], xmm0 // e8???????? | $sequence_5 = { c78524e7ffff07000000 66898510e7ffff 8d85f8e6ffff 50 8d8540e7ffff c78520e7ffff00000000 50 } // n = 7, score = 200 // c78524e7ffff07000000 | mov dword ptr [ebp - 0x18dc], 7 // 66898510e7ffff | mov word ptr [ebp - 0x18f0], ax // 8d85f8e6ffff | lea eax, [ebp - 0x1908] // 50 | push eax // 8d8540e7ffff | lea eax, [ebp - 0x18c0] // c78520e7ffff00000000 | mov dword ptr [ebp - 0x18e0], 0 // 50 | push eax $sequence_6 = { 8d4e01 8a06 46 84c0 75f9 8d4588 } // n = 6, score = 200 // 8d4e01 | lea ecx, [esi + 1] // 8a06 | mov al, byte ptr [esi] // 46 | inc esi // 84c0 | test al, al // 75f9 | jne 0xfffffffb // 8d4588 | lea eax, [ebp - 0x78] $sequence_7 = { e8???????? 83c40c 019dc4feffff 8b85c4feffff } // n = 4, score = 200 // e8???????? | // 83c40c | add esp, 0xc // 019dc4feffff | add dword ptr [ebp - 0x13c], ebx // 8b85c4feffff | mov eax, dword ptr [ebp - 0x13c] $sequence_8 = { 83ec08 8845f0 8d45f0 50 e8???????? 884435e8 } // n = 6, score = 200 // 83ec08 | sub esp, 8 // 8845f0 | mov byte ptr [ebp - 0x10], al // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // e8???????? | // 884435e8 | mov byte ptr [ebp + esi - 0x18], al $sequence_9 = { 8d8d70e7ffff 6a12 33c0 c78584e7ffff07000000 } // n = 4, score = 200 // 8d8d70e7ffff | lea ecx, [ebp - 0x1890] // 6a12 | push 0x12 // 33c0 | xor eax, eax // c78584e7ffff07000000 | mov dword ptr [ebp - 0x187c], 7 condition: 7 of them and filesize < 335872 }
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