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rule win_webc2_rave_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.webc2_rave." 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_rave" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 0f8454010000 8b35???????? 8d542414 6a00 } // n = 4, score = 100 // 0f8454010000 | je 0x15a // 8b35???????? | // 8d542414 | lea edx, [esp + 0x14] // 6a00 | push 0 $sequence_1 = { 0f84ea000000 8d542414 6a00 52 8d44241a 6a01 } // n = 6, score = 100 // 0f84ea000000 | je 0xf0 // 8d542414 | lea edx, [esp + 0x14] // 6a00 | push 0 // 52 | push edx // 8d44241a | lea eax, [esp + 0x1a] // 6a01 | push 1 $sequence_2 = { 56 68???????? 53 52 ffd7 3bc3 894614 } // n = 7, score = 100 // 56 | push esi // 68???????? | // 53 | push ebx // 52 | push edx // ffd7 | call edi // 3bc3 | cmp eax, ebx // 894614 | mov dword ptr [esi + 0x14], eax $sequence_3 = { f7d1 49 3bd9 72e5 } // n = 4, score = 100 // f7d1 | not ecx // 49 | dec ecx // 3bd9 | cmp ebx, ecx // 72e5 | jb 0xffffffe7 $sequence_4 = { 8d442418 50 51 e8???????? 85c0 74b1 } // n = 6, score = 100 // 8d442418 | lea eax, [esp + 0x18] // 50 | push eax // 51 | push ecx // e8???????? | // 85c0 | test eax, eax // 74b1 | je 0xffffffb3 $sequence_5 = { 895c2448 ffd7 3bc3 894610 7517 } // n = 5, score = 100 // 895c2448 | mov dword ptr [esp + 0x48], ebx // ffd7 | call edi // 3bc3 | cmp eax, ebx // 894610 | mov dword ptr [esi + 0x10], eax // 7517 | jne 0x19 $sequence_6 = { 7418 8b742418 46 4f } // n = 4, score = 100 // 7418 | je 0x1a // 8b742418 | mov esi, dword ptr [esp + 0x18] // 46 | inc esi // 4f | dec edi $sequence_7 = { 33c9 33f6 85ed 7e45 8b942414020000 53 } // n = 6, score = 100 // 33c9 | xor ecx, ecx // 33f6 | xor esi, esi // 85ed | test ebp, ebp // 7e45 | jle 0x47 // 8b942414020000 | mov edx, dword ptr [esp + 0x214] // 53 | push ebx $sequence_8 = { 03d1 8bca 894c2414 7872 } // n = 4, score = 100 // 03d1 | add edx, ecx // 8bca | mov ecx, edx // 894c2414 | mov dword ptr [esp + 0x14], ecx // 7872 | js 0x74 $sequence_9 = { e8???????? 83c404 ff15???????? 85ff } // n = 4, score = 100 // e8???????? | // 83c404 | add esp, 4 // ff15???????? | // 85ff | test edi, edi condition: 7 of them and filesize < 57344 }
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