Actor(s): Tonto Team
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rule win_dexbia_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.dexbia." 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.dexbia" 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 = { 8bfd b908000000 be???????? 83c520 83c320 } // n = 5, score = 200 // 8bfd | mov edi, ebp // b908000000 | mov ecx, 8 // be???????? | // 83c520 | add ebp, 0x20 // 83c320 | add ebx, 0x20 $sequence_1 = { a3???????? e8???????? 8db6ec894000 bf???????? } // n = 4, score = 200 // a3???????? | // e8???????? | // 8db6ec894000 | lea esi, [esi + 0x4089ec] // bf???????? | $sequence_2 = { ff15???????? 85c0 740c 8b442414 85c0 742a } // n = 6, score = 200 // ff15???????? | // 85c0 | test eax, eax // 740c | je 0xe // 8b442414 | mov eax, dword ptr [esp + 0x14] // 85c0 | test eax, eax // 742a | je 0x2c $sequence_3 = { 5b 81c4e81b0000 c20400 57 ff15???????? b97f000000 33c0 } // n = 7, score = 200 // 5b | pop ebx // 81c4e81b0000 | add esp, 0x1be8 // c20400 | ret 4 // 57 | push edi // ff15???????? | // b97f000000 | mov ecx, 0x7f // 33c0 | xor eax, eax $sequence_4 = { f3a5 8bcb 8d442410 83e103 50 f3a4 68???????? } // n = 7, score = 200 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bcb | mov ecx, ebx // 8d442410 | lea eax, [esp + 0x10] // 83e103 | and ecx, 3 // 50 | push eax // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 68???????? | $sequence_5 = { 5e 5d 33c0 5b 81c408100000 c3 68???????? } // n = 7, score = 200 // 5e | pop esi // 5d | pop ebp // 33c0 | xor eax, eax // 5b | pop ebx // 81c408100000 | add esp, 0x1008 // c3 | ret // 68???????? | $sequence_6 = { 50 ffd5 a1???????? 85c0 0f841dffffff e8???????? 5f } // n = 7, score = 200 // 50 | push eax // ffd5 | call ebp // a1???????? | // 85c0 | test eax, eax // 0f841dffffff | je 0xffffff23 // e8???????? | // 5f | pop edi $sequence_7 = { 80e920 ebe0 80a0a09e400000 40 } // n = 4, score = 200 // 80e920 | sub cl, 0x20 // ebe0 | jmp 0xffffffe2 // 80a0a09e400000 | and byte ptr [eax + 0x409ea0], 0 // 40 | inc eax $sequence_8 = { 81c408100000 c3 ff15???????? 6a00 ff15???????? 5f 5e } // n = 7, score = 200 // 81c408100000 | add esp, 0x1008 // c3 | ret // ff15???????? | // 6a00 | push 0 // ff15???????? | // 5f | pop edi // 5e | pop esi $sequence_9 = { 83c404 8bf0 33c0 89442414 8944241c } // n = 5, score = 200 // 83c404 | add esp, 4 // 8bf0 | mov esi, eax // 33c0 | xor eax, eax // 89442414 | mov dword ptr [esp + 0x14], eax // 8944241c | mov dword ptr [esp + 0x1c], eax condition: 7 of them and filesize < 106496 }
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