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rule win_webc2_yahoo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 8b7708 83c418 3b770c 7377 8d8600010000 53 89450c } // n = 7, score = 100 // 8b7708 | mov esi, dword ptr [edi + 8] // 83c418 | add esp, 0x18 // 3b770c | cmp esi, dword ptr [edi + 0xc] // 7377 | jae 0x79 // 8d8600010000 | lea eax, [esi + 0x100] // 53 | push ebx // 89450c | mov dword ptr [ebp + 0xc], eax $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 = { 85c0 7403 50 ffd7 8bb694841e00 85f6 7403 } // n = 7, score = 100 // 85c0 | test eax, eax // 7403 | je 5 // 50 | push eax // ffd7 | call edi // 8bb694841e00 | mov esi, dword ptr [esi + 0x1e8494] // 85f6 | test esi, esi // 7403 | je 5 $sequence_3 = { 59 7637 8d0433 8945fc 56 e8???????? } // n = 6, score = 100 // 59 | pop ecx // 7637 | jbe 0x39 // 8d0433 | lea eax, [ebx + esi] // 8945fc | mov dword ptr [ebp - 4], eax // 56 | push esi // e8???????? | $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 = { 6a00 50 e8???????? 83c418 035dec } // n = 5, score = 100 // 6a00 | push 0 // 50 | push eax // e8???????? | // 83c418 | add esp, 0x18 // 035dec | add ebx, dword ptr [ebp - 0x14] $sequence_6 = { 57 898694841e00 e8???????? 399e94841e00 59 57 7517 } // n = 7, score = 100 // 57 | push edi // 898694841e00 | mov dword ptr [esi + 0x1e8494], eax // e8???????? | // 399e94841e00 | cmp dword ptr [esi + 0x1e8494], ebx // 59 | pop ecx // 57 | push edi // 7517 | jne 0x19 $sequence_7 = { 85c0 7508 83c8ff e9???????? 8d85c8fdffff 56 50 } // n = 7, score = 100 // 85c0 | test eax, eax // 7508 | jne 0xa // 83c8ff | or eax, 0xffffffff // e9???????? | // 8d85c8fdffff | lea eax, [ebp - 0x238] // 56 | push esi // 50 | push eax $sequence_8 = { 53 e8???????? 83c410 e8???????? 53 e8???????? } // n = 6, score = 100 // 53 | push ebx // e8???????? | // 83c410 | add esp, 0x10 // e8???????? | // 53 | push ebx // e8???????? | $sequence_9 = { 03c3 0345fc 50 e8???????? 6801280000 8d85d8d7ffff } // n = 6, score = 100 // 03c3 | add eax, ebx // 0345fc | add eax, dword ptr [ebp - 4] // 50 | push eax // e8???????? | // 6801280000 | push 0x2801 // 8d85d8d7ffff | lea eax, [ebp - 0x2828] condition: 7 of them and filesize < 8060928 }
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