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rule win_webc2_bolid_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.webc2_bolid." 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.webc2_bolid" 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 = { 741e 8b4c240c 51 ff15???????? 56 68???????? e8???????? } // n = 7, score = 100 // 741e | je 0x20 // 8b4c240c | mov ecx, dword ptr [esp + 0xc] // 51 | push ecx // ff15???????? | // 56 | push esi // 68???????? | // e8???????? | $sequence_1 = { e8???????? 8d8c24d4000000 c684242c02000004 51 8bcd e8???????? 8b15???????? } // n = 7, score = 100 // e8???????? | // 8d8c24d4000000 | lea ecx, [esp + 0xd4] // c684242c02000004 | mov byte ptr [esp + 0x22c], 4 // 51 | push ecx // 8bcd | mov ecx, ebp // e8???????? | // 8b15???????? | $sequence_2 = { 8bcb e8???????? 85c0 0f84fa000000 8b550c 42 } // n = 6, score = 100 // 8bcb | mov ecx, ebx // e8???????? | // 85c0 | test eax, eax // 0f84fa000000 | je 0x100 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 42 | inc edx $sequence_3 = { 49 885c2454 51 68???????? 8d4c2444 } // n = 5, score = 100 // 49 | dec ecx // 885c2454 | mov byte ptr [esp + 0x54], bl // 51 | push ecx // 68???????? | // 8d4c2444 | lea ecx, [esp + 0x44] $sequence_4 = { 83c40c 8b15???????? 8d4de4 52 } // n = 4, score = 100 // 83c40c | add esp, 0xc // 8b15???????? | // 8d4de4 | lea ecx, [ebp - 0x1c] // 52 | push edx $sequence_5 = { e8???????? 6a01 8d4c2440 c644245800 e8???????? 8b4c2460 } // n = 6, score = 100 // e8???????? | // 6a01 | push 1 // 8d4c2440 | lea ecx, [esp + 0x40] // c644245800 | mov byte ptr [esp + 0x58], 0 // e8???????? | // 8b4c2460 | mov ecx, dword ptr [esp + 0x60] $sequence_6 = { f3a4 8b35???????? 8d4c2410 51 6a26 52 89442420 } // n = 7, score = 100 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8b35???????? | // 8d4c2410 | lea ecx, [esp + 0x10] // 51 | push ecx // 6a26 | push 0x26 // 52 | push edx // 89442420 | mov dword ptr [esp + 0x20], eax $sequence_7 = { 8b458c 3bc3 7505 b8???????? } // n = 4, score = 100 // 8b458c | mov eax, dword ptr [ebp - 0x74] // 3bc3 | cmp eax, ebx // 7505 | jne 7 // b8???????? | $sequence_8 = { 50 ff5104 33db 6a01 } // n = 4, score = 100 // 50 | push eax // ff5104 | call dword ptr [ecx + 4] // 33db | xor ebx, ebx // 6a01 | push 1 $sequence_9 = { 53 880e 8bce e8???????? 8b15???????? 8d44245c } // n = 6, score = 100 // 53 | push ebx // 880e | mov byte ptr [esi], cl // 8bce | mov ecx, esi // e8???????? | // 8b15???????? | // 8d44245c | lea eax, [esp + 0x5c] condition: 7 of them and filesize < 163840 }
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