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rule win_linseningsvr_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.linseningsvr." 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.linseningsvr" 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 = { 7355 8bc1 8bf1 c1f805 83e61f 8d3c85c08d4000 } // n = 6, score = 100 // 7355 | jae 0x57 // 8bc1 | mov eax, ecx // 8bf1 | mov esi, ecx // c1f805 | sar eax, 5 // 83e61f | and esi, 0x1f // 8d3c85c08d4000 | lea edi, [eax*4 + 0x408dc0] $sequence_1 = { f682818c400004 7403 40 ff01 ff01 } // n = 5, score = 100 // f682818c400004 | test byte ptr [edx + 0x408c81], 4 // 7403 | je 5 // 40 | inc eax // ff01 | inc dword ptr [ecx] // ff01 | inc dword ptr [ecx] $sequence_2 = { 8b4c2418 85c9 7e16 8b742414 } // n = 4, score = 100 // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] // 85c9 | test ecx, ecx // 7e16 | jle 0x18 // 8b742414 | mov esi, dword ptr [esp + 0x14] $sequence_3 = { 8d1c85c08d4000 8b0485c08d4000 03c6 8a5004 } // n = 4, score = 100 // 8d1c85c08d4000 | lea ebx, [eax*4 + 0x408dc0] // 8b0485c08d4000 | mov eax, dword ptr [eax*4 + 0x408dc0] // 03c6 | add eax, esi // 8a5004 | mov dl, byte ptr [eax + 4] $sequence_4 = { 52 53 ffd5 3d10010000 75e7 b904000000 } // n = 6, score = 100 // 52 | push edx // 53 | push ebx // ffd5 | call ebp // 3d10010000 | cmp eax, 0x110 // 75e7 | jne 0xffffffe9 // b904000000 | mov ecx, 4 $sequence_5 = { 68???????? 50 e8???????? ffb6fc874000 8d8560ffffff } // n = 5, score = 100 // 68???????? | // 50 | push eax // e8???????? | // ffb6fc874000 | push dword ptr [esi + 0x4087fc] // 8d8560ffffff | lea eax, [ebp - 0xa0] $sequence_6 = { 8bf8 83c408 85ff 750a 6a64 ff15???????? ebdd } // n = 7, score = 100 // 8bf8 | mov edi, eax // 83c408 | add esp, 8 // 85ff | test edi, edi // 750a | jne 0xc // 6a64 | push 0x64 // ff15???????? | // ebdd | jmp 0xffffffdf $sequence_7 = { 8bcb 0c01 c1f905 83e61f 88450b 8d3c8dc08d4000 c1e603 } // n = 7, score = 100 // 8bcb | mov ecx, ebx // 0c01 | or al, 1 // c1f905 | sar ecx, 5 // 83e61f | and esi, 0x1f // 88450b | mov byte ptr [ebp + 0xb], al // 8d3c8dc08d4000 | lea edi, [ecx*4 + 0x408dc0] // c1e603 | shl esi, 3 $sequence_8 = { 7718 c705????????0d000000 c3 8b04d5cc834000 a3???????? } // n = 5, score = 100 // 7718 | ja 0x1a // c705????????0d000000 | // c3 | ret // 8b04d5cc834000 | mov eax, dword ptr [edx*8 + 0x4083cc] // a3???????? | $sequence_9 = { 83c408 55 6800010000 8d942464040000 6a01 } // n = 5, score = 100 // 83c408 | add esp, 8 // 55 | push ebp // 6800010000 | push 0x100 // 8d942464040000 | lea edx, [esp + 0x464] // 6a01 | push 1 condition: 7 of them and filesize < 81360 }
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