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rule win_webc2_bolid_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8801 eb09 51 e8???????? 83c404 8b442450 899c2480000000 } // n = 7, score = 100 // 8801 | mov byte ptr [ecx], al // eb09 | jmp 0xb // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // 8b442450 | mov eax, dword ptr [esp + 0x50] // 899c2480000000 | mov dword ptr [esp + 0x80], ebx $sequence_1 = { 8bcd e8???????? c644245405 bf???????? 83cdff 33c0 } // n = 6, score = 100 // 8bcd | mov ecx, ebp // e8???????? | // c644245405 | mov byte ptr [esp + 0x54], 5 // bf???????? | // 83cdff | or ebp, 0xffffffff // 33c0 | xor eax, eax $sequence_2 = { c1f905 83e61f 88450b 8d3c8dc01f4100 c1e603 8b0f 80650b48 } // n = 7, score = 100 // c1f905 | sar ecx, 5 // 83e61f | and esi, 0x1f // 88450b | mov byte ptr [ebp + 0xb], al // 8d3c8dc01f4100 | lea edi, [ecx*4 + 0x411fc0] // c1e603 | shl esi, 3 // 8b0f | mov ecx, dword ptr [edi] // 80650b48 | and byte ptr [ebp + 0xb], 0x48 $sequence_3 = { 83ec10 8a45f3 53 8bd9 } // n = 4, score = 100 // 83ec10 | sub esp, 0x10 // 8a45f3 | mov al, byte ptr [ebp - 0xd] // 53 | push ebx // 8bd9 | mov ebx, ecx $sequence_4 = { 85c0 763e 8a536c 8d7b6c 83ec10 } // n = 5, score = 100 // 85c0 | test eax, eax // 763e | jbe 0x40 // 8a536c | mov dl, byte ptr [ebx + 0x6c] // 8d7b6c | lea edi, [ebx + 0x6c] // 83ec10 | sub esp, 0x10 $sequence_5 = { 0fb641ff 0fb6d2 3bc2 0f8793000000 80880132410004 } // n = 5, score = 100 // 0fb641ff | movzx eax, byte ptr [ecx - 1] // 0fb6d2 | movzx edx, dl // 3bc2 | cmp eax, edx // 0f8793000000 | ja 0x99 // 80880132410004 | or byte ptr [eax + 0x413201], 4 $sequence_6 = { e8???????? c645fc0f 6a01 8d4da0 } // n = 4, score = 100 // e8???????? | // c645fc0f | mov byte ptr [ebp - 4], 0xf // 6a01 | push 1 // 8d4da0 | lea ecx, [ebp - 0x60] $sequence_7 = { 6a01 8d8d34ffffff c645fc16 e8???????? 8b45a4 85c0 } // n = 6, score = 100 // 6a01 | push 1 // 8d8d34ffffff | lea ecx, [ebp - 0xcc] // c645fc16 | mov byte ptr [ebp - 4], 0x16 // e8???????? | // 8b45a4 | mov eax, dword ptr [ebp - 0x5c] // 85c0 | test eax, eax $sequence_8 = { 8b4f04 8b5508 03ca 2bc6 50 } // n = 5, score = 100 // 8b4f04 | mov ecx, dword ptr [edi + 4] // 8b5508 | mov edx, dword ptr [ebp + 8] // 03ca | add ecx, edx // 2bc6 | sub eax, esi // 50 | push eax $sequence_9 = { c7851cffffff01010000 ff15???????? 8a4d1b 53 884d88 8d4d88 8bf0 } // n = 7, score = 100 // c7851cffffff01010000 | mov dword ptr [ebp - 0xe4], 0x101 // ff15???????? | // 8a4d1b | mov cl, byte ptr [ebp + 0x1b] // 53 | push ebx // 884d88 | mov byte ptr [ebp - 0x78], cl // 8d4d88 | lea ecx, [ebp - 0x78] // 8bf0 | mov esi, eax condition: 7 of them and filesize < 163840 }
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