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rule win_dnschanger_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.dnschanger." 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.dnschanger" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 742e a1???????? 85c0 751c 68???????? } // n = 5, score = 100 // 742e | je 0x30 // a1???????? | // 85c0 | test eax, eax // 751c | jne 0x1e // 68???????? | $sequence_1 = { 89442414 8bf8 68???????? 57 56 e8???????? 57 } // n = 7, score = 100 // 89442414 | mov dword ptr [esp + 0x14], eax // 8bf8 | mov edi, eax // 68???????? | // 57 | push edi // 56 | push esi // e8???????? | // 57 | push edi $sequence_2 = { 85c0 59 740f 80781000 7509 } // n = 5, score = 100 // 85c0 | test eax, eax // 59 | pop ecx // 740f | je 0x11 // 80781000 | cmp byte ptr [eax + 0x10], 0 // 7509 | jne 0xb $sequence_3 = { 8b7c240c 85ff 741e 57 e8???????? } // n = 5, score = 100 // 8b7c240c | mov edi, dword ptr [esp + 0xc] // 85ff | test edi, edi // 741e | je 0x20 // 57 | push edi // e8???????? | $sequence_4 = { 52 6a08 ffd5 50 ffd6 8bf8 } // n = 6, score = 100 // 52 | push edx // 6a08 | push 8 // ffd5 | call ebp // 50 | push eax // ffd6 | call esi // 8bf8 | mov edi, eax $sequence_5 = { 8845ff 84c0 5f 7409 } // n = 4, score = 100 // 8845ff | mov byte ptr [ebp - 1], al // 84c0 | test al, al // 5f | pop edi // 7409 | je 0xb $sequence_6 = { 83c408 ffd6 bf05000000 e8???????? 4f 75f8 } // n = 6, score = 100 // 83c408 | add esp, 8 // ffd6 | call esi // bf05000000 | mov edi, 5 // e8???????? | // 4f | dec edi // 75f8 | jne 0xfffffffa $sequence_7 = { 8b2d???????? 6880020000 6a08 c744241880020000 33db ffd5 } // n = 6, score = 100 // 8b2d???????? | // 6880020000 | push 0x280 // 6a08 | push 8 // c744241880020000 | mov dword ptr [esp + 0x18], 0x280 // 33db | xor ebx, ebx // ffd5 | call ebp $sequence_8 = { eb05 a1???????? 8b0e 85c9 7430 } // n = 5, score = 100 // eb05 | jmp 7 // a1???????? | // 8b0e | mov ecx, dword ptr [esi] // 85c9 | test ecx, ecx // 7430 | je 0x32 $sequence_9 = { e8???????? 83c408 81c604020000 4b 75e7 8b35???????? ffd6 } // n = 7, score = 100 // e8???????? | // 83c408 | add esp, 8 // 81c604020000 | add esi, 0x204 // 4b | dec ebx // 75e7 | jne 0xffffffe9 // 8b35???????? | // ffd6 | call esi condition: 7 of them and filesize < 49152 }
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