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rule win_wslink_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.wslink." 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.wslink" 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 = { e8???????? 85c0 750c c7430c04000000 e9???????? bab1000000 4c8d0d5eaf0700 } // n = 7, score = 100 // e8???????? | // 85c0 | jg 0xa79 // 750c | cmp eax, 0x3ec // c7430c04000000 | jne 0xa52 // e9???????? | // bab1000000 | inc esp // 4c8d0d5eaf0700 | mov ecx, ebx $sequence_1 = { 8b542430 448b442470 33c9 4183e520 e8???????? 8bf8 eb03 } // n = 7, score = 100 // 8b542430 | cmp esi, eax // 448b442470 | jl 0x10a3 // 33c9 | jmp 0x10e7 // 4183e520 | or edi, 0xffffffff // e8???????? | // 8bf8 | jmp 0x10e7 // eb03 | mov edi, 0xfffffffe $sequence_2 = { b828000000 e8???????? 482be0 488b4920 4533c0 488d05355e0600 48394210 } // n = 7, score = 100 // b828000000 | push edi // e8???????? | // 482be0 | dec esp // 488b4920 | mov ebx, dword ptr [edx] // 4533c0 | dec ebp // 488d05355e0600 | mov edx, dword ptr [eax] // 48394210 | dec eax $sequence_3 = { 7e66 488d1509cd0700 41b801000000 488bcb e8???????? 85c0 7e4d } // n = 7, score = 100 // 7e66 | dec esp // 488d1509cd0700 | mov eax, edi // 41b801000000 | dec ecx // 488bcb | mov edx, esp // e8???????? | // 85c0 | dec ecx // 7e4d | mov ecx, esp $sequence_4 = { 7e76 488b4b08 ffc6 e8???????? 3bf0 7cd0 488b03 } // n = 7, score = 100 // 7e76 | mov edi, edi // 488b4b08 | test eax, eax // ffc6 | jne 0x1c31 // e8???????? | // 3bf0 | je 0x1d07 // 7cd0 | dec eax // 488b03 | mov edx, dword ptr [esp + 0xb0] $sequence_5 = { 8d4aeb e8???????? 85db 742e 33d2 488bcf e8???????? } // n = 7, score = 100 // 8d4aeb | sub edi, esp // e8???????? | // 85db | mov dword ptr [ebx + 0x10], eax // 742e | jne 0xbae // 33d2 | cmp esi, 8 // 488bcf | jne 0xbae // e8???????? | $sequence_6 = { e8???????? 488bcf e8???????? 4c8b642478 8b9424a0000000 488bcb e8???????? } // n = 7, score = 100 // e8???????? | // 488bcf | movzx eax, byte ptr [ebp + 0x56] // e8???????? | // 4c8b642478 | inc esp // 8b9424a0000000 | or eax, eax // 488bcb | movzx eax, byte ptr [esi + 0xa] // e8???????? | $sequence_7 = { 8bd7 498bcc 4889442420 e8???????? 85c0 0f8887010000 85ff } // n = 7, score = 100 // 8bd7 | movzx ecx, bh // 498bcc | dec eax // 4889442420 | add edx, eax // e8???????? | // 85c0 | dec ebx // 0f8887010000 | lea eax, [ecx + eax] // 85ff | dec eax $sequence_8 = { 384500 7414 0f1f00 3d00000080 730a 49ffc3 ffc0 } // n = 7, score = 100 // 384500 | dec eax // 7414 | sar ecx, 0x20 // 0f1f00 | dec eax // 3d00000080 | lea edx, [ecx + eax*2] // 730a | inc ecx // 49ffc3 | mov eax, dword ptr [ebp + 0xc] // ffc0 | dec eax $sequence_9 = { 8bef e8???????? 85c0 7e33 448d6703 488b0b 8bd5 } // n = 7, score = 100 // 8bef | add eax, edi // e8???????? | // 85c0 | inc ecx // 7e33 | movzx eax, byte ptr [esi + 0x2d] // 448d6703 | rol edi, 0x1e // 488b0b | shl eax, 0x10 // 8bd5 | inc edx condition: 7 of them and filesize < 2007040 }
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