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rule win_webc2_adspace_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { ff15???????? 8d8580feffff 68???????? 50 e8???????? 8d4580 50 } // n = 7, score = 100 // ff15???????? | // 8d8580feffff | lea eax, dword ptr [ebp - 0x180] // 68???????? | // 50 | push eax // e8???????? | // 8d4580 | lea eax, dword ptr [ebp - 0x80] // 50 | push eax $sequence_1 = { ffd6 ff7508 ffd6 b8???????? 5e 5b c9 } // n = 7, score = 100 // ffd6 | call esi // ff7508 | push dword ptr [ebp + 8] // ffd6 | call esi // b8???????? | // 5e | pop esi // 5b | pop ebx // c9 | leave $sequence_2 = { 837c241001 6a00 750a 8d842420010000 50 eb01 57 } // n = 7, score = 100 // 837c241001 | cmp dword ptr [esp + 0x10], 1 // 6a00 | push 0 // 750a | jne 0xc // 8d842420010000 | lea eax, dword ptr [esp + 0x120] // 50 | push eax // eb01 | jmp 3 // 57 | push edi $sequence_3 = { 0f8570010000 be???????? 56 55 ffd3 } // n = 5, score = 100 // 0f8570010000 | jne 0x176 // be???????? | // 56 | push esi // 55 | push ebp // ffd3 | call ebx $sequence_4 = { ff15???????? 8b1d???????? 8d842428010000 50 55 ffd3 } // n = 6, score = 100 // ff15???????? | // 8b1d???????? | // 8d842428010000 | lea eax, dword ptr [esp + 0x128] // 50 | push eax // 55 | push ebp // ffd3 | call ebx $sequence_5 = { 750a 8d842420010000 50 eb01 57 55 } // n = 6, score = 100 // 750a | jne 0xc // 8d842420010000 | lea eax, dword ptr [esp + 0x120] // 50 | push eax // eb01 | jmp 3 // 57 | push edi // 55 | push ebp $sequence_6 = { eb13 8b35???????? 53 ffd6 ff7508 ffd6 } // n = 6, score = 100 // eb13 | jmp 0x15 // 8b35???????? | // 53 | push ebx // ffd6 | call esi // ff7508 | push dword ptr [ebp + 8] // ffd6 | call esi $sequence_7 = { e8???????? 6a03 e8???????? 8b35???????? 68???????? ffd6 8bf8 } // n = 7, score = 100 // e8???????? | // 6a03 | push 3 // e8???????? | // 8b35???????? | // 68???????? | // ffd6 | call esi // 8bf8 | mov edi, eax $sequence_8 = { 56 57 6a1f 59 33c0 8d7d81 } // n = 6, score = 100 // 56 | push esi // 57 | push edi // 6a1f | push 0x1f // 59 | pop ecx // 33c0 | xor eax, eax // 8d7d81 | lea edi, dword ptr [ebp - 0x7f] $sequence_9 = { c9 c3 8bc1 c3 c3 8b442404 } // n = 6, score = 100 // c9 | leave // c3 | ret // 8bc1 | mov eax, ecx // c3 | ret // c3 | ret // 8b442404 | mov eax, dword ptr [esp + 4] condition: 7 of them and filesize < 49152 }
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