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rule win_webc2_bolid_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 68???????? 64a100000000 50 64892500000000 83ec10 8a45f3 } // n = 6, score = 100 // 68???????? | // 64a100000000 | mov eax, dword ptr fs:[0] // 50 | push eax // 64892500000000 | mov dword ptr fs:[0], esp // 83ec10 | sub esp, 0x10 // 8a45f3 | mov al, byte ptr [ebp - 0xd] $sequence_1 = { 83c40c 2bc6 8bcf 6a00 50 894508 e8???????? } // n = 7, score = 100 // 83c40c | add esp, 0xc // 2bc6 | sub eax, esi // 8bcf | mov ecx, edi // 6a00 | push 0 // 50 | push eax // 894508 | mov dword ptr [ebp + 8], eax // e8???????? | $sequence_2 = { f2ae f7d1 49 8bf1 8d8bdc000000 56 8975e8 } // n = 7, score = 100 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // 8bf1 | mov esi, ecx // 8d8bdc000000 | lea ecx, [ebx + 0xdc] // 56 | push esi // 8975e8 | mov dword ptr [ebp - 0x18], esi $sequence_3 = { 83c314 f2ae f7d1 49 6a01 8be9 } // n = 6, score = 100 // 83c314 | add ebx, 0x14 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // 6a01 | push 1 // 8be9 | mov ebp, ecx $sequence_4 = { 7509 ff15???????? 89432c 8b8394000000 } // n = 4, score = 100 // 7509 | jne 0xb // ff15???????? | // 89432c | mov dword ptr [ebx + 0x2c], eax // 8b8394000000 | mov eax, dword ptr [ebx + 0x94] $sequence_5 = { 895c242c 895c2430 6a01 895c2438 c68424000200000a } // n = 5, score = 100 // 895c242c | mov dword ptr [esp + 0x2c], ebx // 895c2430 | mov dword ptr [esp + 0x30], ebx // 6a01 | push 1 // 895c2438 | mov dword ptr [esp + 0x38], ebx // c68424000200000a | mov byte ptr [esp + 0x200], 0xa $sequence_6 = { 8d442424 52 53 50 8bce e8???????? 8bcd } // n = 7, score = 100 // 8d442424 | lea eax, [esp + 0x24] // 52 | push edx // 53 | push ebx // 50 | push eax // 8bce | mov ecx, esi // e8???????? | // 8bcd | mov ecx, ebp $sequence_7 = { 8a4c2413 53 884c2460 8d4c2460 c684240002000001 e8???????? 8a542413 } // n = 7, score = 100 // 8a4c2413 | mov cl, byte ptr [esp + 0x13] // 53 | push ebx // 884c2460 | mov byte ptr [esp + 0x60], cl // 8d4c2460 | lea ecx, [esp + 0x60] // c684240002000001 | mov byte ptr [esp + 0x200], 1 // e8???????? | // 8a542413 | mov dl, byte ptr [esp + 0x13] $sequence_8 = { 897598 f7d1 49 51 68???????? 50 56 } // n = 7, score = 100 // 897598 | mov dword ptr [ebp - 0x68], esi // f7d1 | not ecx // 49 | dec ecx // 51 | push ecx // 68???????? | // 50 | push eax // 56 | push esi $sequence_9 = { c745e801000000 ffd7 8bf0 85f6 0f8e08010000 } // n = 5, score = 100 // c745e801000000 | mov dword ptr [ebp - 0x18], 1 // ffd7 | call edi // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 0f8e08010000 | jle 0x10e condition: 7 of them and filesize < 163840 }
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