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rule win_dnschanger_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { ff15???????? 8bf0 8b442414 6800010000 } // n = 4, score = 100 // ff15???????? | // 8bf0 | mov esi, eax // 8b442414 | mov eax, dword ptr [esp + 0x14] // 6800010000 | push 0x100 $sequence_1 = { b301 57 ff15???????? 85f6 740c 56 6a00 } // n = 7, score = 100 // b301 | mov bl, 1 // 57 | push edi // ff15???????? | // 85f6 | test esi, esi // 740c | je 0xe // 56 | push esi // 6a00 | push 0 $sequence_2 = { 8bc2 03c7 eb02 8bc7 5f } // n = 5, score = 100 // 8bc2 | mov eax, edx // 03c7 | add eax, edi // eb02 | jmp 4 // 8bc7 | mov eax, edi // 5f | pop edi $sequence_3 = { be04000000 5f 8bc6 5e 81c494000000 } // n = 5, score = 100 // be04000000 | mov esi, 4 // 5f | pop edi // 8bc6 | mov eax, esi // 5e | pop esi // 81c494000000 | add esp, 0x94 $sequence_4 = { ff7508 66ab aa ff15???????? } // n = 4, score = 100 // ff7508 | push dword ptr [ebp + 8] // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // ff15???????? | $sequence_5 = { 8b542408 53 8a1a 8819 41 42 84db } // n = 7, score = 100 // 8b542408 | mov edx, dword ptr [esp + 8] // 53 | push ebx // 8a1a | mov bl, byte ptr [edx] // 8819 | mov byte ptr [ecx], bl // 41 | inc ecx // 42 | inc edx // 84db | test bl, bl $sequence_6 = { 3b0e 72f2 57 57 57 } // n = 5, score = 100 // 3b0e | cmp ecx, dword ptr [esi] // 72f2 | jb 0xfffffff4 // 57 | push edi // 57 | push edi // 57 | push edi $sequence_7 = { 57 57 56 57 ff75fc ff15???????? } // n = 6, score = 100 // 57 | push edi // 57 | push edi // 56 | push esi // 57 | push edi // ff75fc | push dword ptr [ebp - 4] // ff15???????? | $sequence_8 = { 5e 81c494000000 c3 83f806 } // n = 4, score = 100 // 5e | pop esi // 81c494000000 | add esp, 0x94 // c3 | ret // 83f806 | cmp eax, 6 $sequence_9 = { f3aa 8bc6 5f 5e c3 } // n = 5, score = 100 // f3aa | rep stosb byte ptr es:[edi], al // 8bc6 | mov eax, esi // 5f | pop edi // 5e | pop esi // c3 | ret condition: 7 of them and filesize < 49152 }
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