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rule win_webc2_bolid_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 6a01 8d442470 83ec10 8bcc 89642438 50 } // n = 6, score = 100 // 6a01 | push 1 // 8d442470 | lea eax, [esp + 0x70] // 83ec10 | sub esp, 0x10 // 8bcc | mov ecx, esp // 89642438 | mov dword ptr [esp + 0x38], esp // 50 | push eax $sequence_1 = { 51 8bc8 e8???????? 8b4df4 5f 8bc3 5e } // n = 7, score = 100 // 51 | push ecx // 8bc8 | mov ecx, eax // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 5f | pop edi // 8bc3 | mov eax, ebx // 5e | pop esi $sequence_2 = { 6a00 c745ec00000000 c745e801000000 ffd7 } // n = 4, score = 100 // 6a00 | push 0 // c745ec00000000 | mov dword ptr [ebp - 0x14], 0 // c745e801000000 | mov dword ptr [ebp - 0x18], 1 // ffd7 | call edi $sequence_3 = { 88442428 83c9ff 33c0 83c414 f2ae f7d1 } // n = 6, score = 100 // 88442428 | mov byte ptr [esp + 0x28], al // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // 83c414 | add esp, 0x14 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx $sequence_4 = { 3ad9 7510 8bce 8bfd 8bf0 33db } // n = 6, score = 100 // 3ad9 | cmp bl, cl // 7510 | jne 0x12 // 8bce | mov ecx, esi // 8bfd | mov edi, ebp // 8bf0 | mov esi, eax // 33db | xor ebx, ebx $sequence_5 = { e8???????? 6a01 8d8eec000000 c64424180a e8???????? } // n = 5, score = 100 // e8???????? | // 6a01 | push 1 // 8d8eec000000 | lea ecx, [esi + 0xec] // c64424180a | mov byte ptr [esp + 0x18], 0xa // e8???????? | $sequence_6 = { 8808 8b44241c 3bc6 77ac } // n = 4, score = 100 // 8808 | mov byte ptr [eax], cl // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 3bc6 | cmp eax, esi // 77ac | ja 0xffffffae $sequence_7 = { 8d4c2420 e8???????? 83f8ff 7469 8a542414 83ec10 } // n = 6, score = 100 // 8d4c2420 | lea ecx, [esp + 0x20] // e8???????? | // 83f8ff | cmp eax, -1 // 7469 | je 0x6b // 8a542414 | mov dl, byte ptr [esp + 0x14] // 83ec10 | sub esp, 0x10 $sequence_8 = { e8???????? 8a4c244c 83ec10 8bf4 } // n = 4, score = 100 // e8???????? | // 8a4c244c | mov cl, byte ptr [esp + 0x4c] // 83ec10 | sub esp, 0x10 // 8bf4 | mov esi, esp $sequence_9 = { b90f000000 33c0 8d7c2410 c784246c06000000000000 } // n = 4, score = 100 // b90f000000 | mov ecx, 0xf // 33c0 | xor eax, eax // 8d7c2410 | lea edi, [esp + 0x10] // c784246c06000000000000 | mov dword ptr [esp + 0x66c], 0 condition: 7 of them and filesize < 163840 }
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