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rule win_webc2_yahoo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.webc2_yahoo." 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_yahoo" 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 = { 8d4590 68???????? 50 e8???????? 59 } // n = 5, score = 100 // 8d4590 | lea eax, [ebp - 0x70] // 68???????? | // 50 | push eax // e8???????? | // 59 | pop ecx $sequence_1 = { 69c010270000 03c8 4e 8bc1 99 f7fe 8b45f4 } // n = 7, score = 100 // 69c010270000 | imul eax, eax, 0x2710 // 03c8 | add ecx, eax // 4e | dec esi // 8bc1 | mov eax, ecx // 99 | cdq // f7fe | idiv esi // 8b45f4 | mov eax, dword ptr [ebp - 0xc] $sequence_2 = { 0f84d7010000 48 0f841b010000 48 0f84bd000000 48 7458 } // n = 7, score = 100 // 0f84d7010000 | je 0x1dd // 48 | dec eax // 0f841b010000 | je 0x121 // 48 | dec eax // 0f84bd000000 | je 0xc3 // 48 | dec eax // 7458 | je 0x5a $sequence_3 = { e8???????? 8b450c 83c414 80240300 57 } // n = 5, score = 100 // e8???????? | // 8b450c | mov eax, dword ptr [ebp + 0xc] // 83c414 | add esp, 0x14 // 80240300 | and byte ptr [ebx + eax], 0 // 57 | push edi $sequence_4 = { 53 56 ff750c ff15???????? 57 } // n = 5, score = 100 // 53 | push ebx // 56 | push esi // ff750c | push dword ptr [ebp + 0xc] // ff15???????? | // 57 | push edi $sequence_5 = { 8818 8d85f4feffff 50 ff15???????? } // n = 4, score = 100 // 8818 | mov byte ptr [eax], bl // 8d85f4feffff | lea eax, [ebp - 0x10c] // 50 | push eax // ff15???????? | $sequence_6 = { 8bec b828280000 e8???????? 53 56 57 } // n = 6, score = 100 // 8bec | mov ebp, esp // b828280000 | mov eax, 0x2828 // e8???????? | // 53 | push ebx // 56 | push esi // 57 | push edi $sequence_7 = { 034510 50 e8???????? 6a64 e8???????? 011e } // n = 6, score = 100 // 034510 | add eax, dword ptr [ebp + 0x10] // 50 | push eax // e8???????? | // 6a64 | push 0x64 // e8???????? | // 011e | add dword ptr [esi], ebx $sequence_8 = { eb29 8d459c 50 ff15???????? 50 a3???????? e8???????? } // n = 7, score = 100 // eb29 | jmp 0x2b // 8d459c | lea eax, [ebp - 0x64] // 50 | push eax // ff15???????? | // 50 | push eax // a3???????? | // e8???????? | $sequence_9 = { 53 57 56 e8???????? ff7508 56 68???????? } // n = 7, score = 100 // 53 | push ebx // 57 | push edi // 56 | push esi // e8???????? | // ff7508 | push dword ptr [ebp + 8] // 56 | push esi // 68???????? | condition: 7 of them and filesize < 8060928 }
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