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rule win_webc2_rave_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { b900010000 8dbc24b0040000 f3ab 8d4c241c 53 } // n = 5, score = 100 // b900010000 | mov ecx, 0x100 // 8dbc24b0040000 | lea edi, [esp + 0x4b0] // f3ab | rep stosd dword ptr es:[edi], eax // 8d4c241c | lea ecx, [esp + 0x1c] // 53 | push ebx $sequence_1 = { ff15???????? 83c410 3dffff0000 7f11 } // n = 4, score = 100 // ff15???????? | // 83c410 | add esp, 0x10 // 3dffff0000 | cmp eax, 0xffff // 7f11 | jg 0x13 $sequence_2 = { 33c0 8d7c2450 895c244c 8bb424b8080000 } // n = 4, score = 100 // 33c0 | xor eax, eax // 8d7c2450 | lea edi, [esp + 0x50] // 895c244c | mov dword ptr [esp + 0x4c], ebx // 8bb424b8080000 | mov esi, dword ptr [esp + 0x8b8] $sequence_3 = { 3bdd 57 0f845d010000 8b7c2420 3bfd 0f8451010000 396c2424 } // n = 7, score = 100 // 3bdd | cmp ebx, ebp // 57 | push edi // 0f845d010000 | je 0x163 // 8b7c2420 | mov edi, dword ptr [esp + 0x20] // 3bfd | cmp edi, ebp // 0f8451010000 | je 0x157 // 396c2424 | cmp dword ptr [esp + 0x24], ebp $sequence_4 = { 51 ffd7 8b4608 3bc3 7409 50 } // n = 6, score = 100 // 51 | push ecx // ffd7 | call edi // 8b4608 | mov eax, dword ptr [esi + 8] // 3bc3 | cmp eax, ebx // 7409 | je 0xb // 50 | push eax $sequence_5 = { a1???????? 83f805 7d27 8bd0 8d4c2410 42 } // n = 6, score = 100 // a1???????? | // 83f805 | cmp eax, 5 // 7d27 | jge 0x29 // 8bd0 | mov edx, eax // 8d4c2410 | lea ecx, [esp + 0x10] // 42 | inc edx $sequence_6 = { 6a00 51 56 53 ffd5 8bf8 } // n = 6, score = 100 // 6a00 | push 0 // 51 | push ecx // 56 | push esi // 53 | push ebx // ffd5 | call ebp // 8bf8 | mov edi, eax $sequence_7 = { 8bf3 8a5c3410 885c0c10 88443410 8a5c0c10 } // n = 5, score = 100 // 8bf3 | mov esi, ebx // 8a5c3410 | mov bl, byte ptr [esp + esi + 0x10] // 885c0c10 | mov byte ptr [esp + ecx + 0x10], bl // 88443410 | mov byte ptr [esp + esi + 0x10], al // 8a5c0c10 | mov bl, byte ptr [esp + ecx + 0x10] $sequence_8 = { f3a5 8bcd 83e103 f3a4 8b742410 2bf2 } // n = 6, score = 100 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bcd | mov ecx, ebp // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8b742410 | mov esi, dword ptr [esp + 0x10] // 2bf2 | sub esi, edx $sequence_9 = { ff15???????? 83f8ff 746d 8b9424d4010000 66c74424140200 } // n = 5, score = 100 // ff15???????? | // 83f8ff | cmp eax, -1 // 746d | je 0x6f // 8b9424d4010000 | mov edx, dword ptr [esp + 0x1d4] // 66c74424140200 | mov word ptr [esp + 0x14], 2 condition: 7 of them and filesize < 57344 }
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