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rule win_webc2_adspace_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.webc2_adspace." 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_adspace" 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 = { 8b1d???????? 8d842428010000 50 55 ffd3 83c414 } // n = 6, score = 100 // 8b1d???????? | // 8d842428010000 | lea eax, [esp + 0x128] // 50 | push eax // 55 | push ebp // ffd3 | call ebx // 83c414 | add esp, 0x14 $sequence_1 = { e8???????? 53 e8???????? 8b1d???????? 83c440 bf???????? } // n = 6, score = 100 // e8???????? | // 53 | push ebx // e8???????? | // 8b1d???????? | // 83c440 | add esp, 0x40 // bf???????? | $sequence_2 = { 83c410 8bf0 e8???????? 6a50 59 } // n = 5, score = 100 // 83c410 | add esp, 0x10 // 8bf0 | mov esi, eax // e8???????? | // 6a50 | push 0x50 // 59 | pop ecx $sequence_3 = { ffd6 b8???????? 5e 5b c9 } // n = 5, score = 100 // ffd6 | call esi // b8???????? | // 5e | pop esi // 5b | pop ebx // c9 | leave $sequence_4 = { 8be8 68???????? 55 e8???????? 83c410 85c0 0f84f8010000 } // n = 7, score = 100 // 8be8 | mov ebp, eax // 68???????? | // 55 | push ebp // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 0f84f8010000 | je 0x1fe $sequence_5 = { 57 55 e8???????? 83c40c 8bf8 57 56 } // n = 7, score = 100 // 57 | push edi // 55 | push ebp // e8???????? | // 83c40c | add esp, 0xc // 8bf8 | mov edi, eax // 57 | push edi // 56 | push esi $sequence_6 = { 85c0 0f85a7000000 8d8580feffff 68???????? 50 ffd6 } // n = 6, score = 100 // 85c0 | test eax, eax // 0f85a7000000 | jne 0xad // 8d8580feffff | lea eax, [ebp - 0x180] // 68???????? | // 50 | push eax // ffd6 | call esi $sequence_7 = { ffd3 59 85c0 59 7403 } // n = 5, score = 100 // ffd3 | call ebx // 59 | pop ecx // 85c0 | test eax, eax // 59 | pop ecx // 7403 | je 5 $sequence_8 = { 56 ff15???????? 8b45fc 56 8b35???????? 881c38 } // n = 6, score = 100 // 56 | push esi // ff15???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 56 | push esi // 8b35???????? | // 881c38 | mov byte ptr [eax + edi], bl $sequence_9 = { 59 33c0 8d7d81 6a00 } // n = 4, score = 100 // 59 | pop ecx // 33c0 | xor eax, eax // 8d7d81 | lea edi, [ebp - 0x7f] // 6a00 | push 0 condition: 7 of them and filesize < 49152 }
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