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rule win_webc2_rave_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 8b4c2410 6a00 51 56 53 } // n = 5, score = 100 // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 6a00 | push 0 // 51 | push ecx // 56 | push esi // 53 | push ebx $sequence_1 = { 7e14 55 8be9 8d7c240c c1e902 f3a5 8bcd } // n = 7, score = 100 // 7e14 | jle 0x16 // 55 | push ebp // 8be9 | mov ebp, ecx // 8d7c240c | lea edi, [esp + 0xc] // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bcd | mov ecx, ebp $sequence_2 = { 57 33f6 33ff 33c0 8844040c 40 } // n = 6, score = 100 // 57 | push edi // 33f6 | xor esi, esi // 33ff | xor edi, edi // 33c0 | xor eax, eax // 8844040c | mov byte ptr [esp + eax + 0xc], al // 40 | inc eax $sequence_3 = { ff15???????? 8dbc24b0040000 83c9ff 33c0 f2ae } // n = 5, score = 100 // ff15???????? | // 8dbc24b0040000 | lea edi, [esp + 0x4b0] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // f2ae | repne scasb al, byte ptr es:[edi] $sequence_4 = { ffd5 8b442410 85c0 7529 6a32 } // n = 5, score = 100 // ffd5 | call ebp // 8b442410 | mov eax, dword ptr [esp + 0x10] // 85c0 | test eax, eax // 7529 | jne 0x2b // 6a32 | push 0x32 $sequence_5 = { 83c004 c20400 83f82d 7508 b83e000000 c20400 } // n = 6, score = 100 // 83c004 | add eax, 4 // c20400 | ret 4 // 83f82d | cmp eax, 0x2d // 7508 | jne 0xa // b83e000000 | mov eax, 0x3e // c20400 | ret 4 $sequence_6 = { 40 3d00010000 7cf4 8b8c2410020000 } // n = 4, score = 100 // 40 | inc eax // 3d00010000 | cmp eax, 0x100 // 7cf4 | jl 0xfffffff6 // 8b8c2410020000 | mov ecx, dword ptr [esp + 0x210] $sequence_7 = { 49 742e 8b942430020000 8d7c2424 2bfa 897c2410 eb04 } // n = 7, score = 100 // 49 | dec ecx // 742e | je 0x30 // 8b942430020000 | mov edx, dword ptr [esp + 0x230] // 8d7c2424 | lea edi, [esp + 0x24] // 2bfa | sub edi, edx // 897c2410 | mov dword ptr [esp + 0x10], edi // eb04 | jmp 6 $sequence_8 = { 56 50 e8???????? 83c408 8944241c 881c30 } // n = 6, score = 100 // 56 | push esi // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // 8944241c | mov dword ptr [esp + 0x1c], eax // 881c30 | mov byte ptr [eax + esi], bl $sequence_9 = { 51 ff15???????? 83c408 e9???????? 8d54244c } // n = 5, score = 100 // 51 | push ecx // ff15???????? | // 83c408 | add esp, 8 // e9???????? | // 8d54244c | lea edx, [esp + 0x4c] condition: 7 of them and filesize < 57344 }
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