Actor(s): Energetic Bear
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rule win_karagany_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.karagany." 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.karagany" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 8b35???????? 57 8bf8 6a03 57 } // n = 5, score = 400 // 8b35???????? | // 57 | push edi // 8bf8 | mov edi, eax // 6a03 | push 3 // 57 | push edi $sequence_1 = { 56 8b35???????? 57 8bf8 6a03 57 ffd6 } // n = 7, score = 400 // 56 | push esi // 8b35???????? | // 57 | push edi // 8bf8 | mov edi, eax // 6a03 | push 3 // 57 | push edi // ffd6 | call esi $sequence_2 = { 8bec 81ec60060000 53 56 57 33c0 } // n = 6, score = 400 // 8bec | mov ebp, esp // 81ec60060000 | sub esp, 0x660 // 53 | push ebx // 56 | push esi // 57 | push edi // 33c0 | xor eax, eax $sequence_3 = { ff15???????? 6a64 ff15???????? 5f 5e 33c0 } // n = 6, score = 400 // ff15???????? | // 6a64 | push 0x64 // ff15???????? | // 5f | pop edi // 5e | pop esi // 33c0 | xor eax, eax $sequence_4 = { ff15???????? 6a00 53 68???????? } // n = 4, score = 400 // ff15???????? | // 6a00 | push 0 // 53 | push ebx // 68???????? | $sequence_5 = { 8b35???????? 57 8bf8 6a03 57 ffd6 85c0 } // n = 7, score = 400 // 8b35???????? | // 57 | push edi // 8bf8 | mov edi, eax // 6a03 | push 3 // 57 | push edi // ffd6 | call esi // 85c0 | test eax, eax $sequence_6 = { 6a03 53 ffd6 85c0 } // n = 4, score = 400 // 6a03 | push 3 // 53 | push ebx // ffd6 | call esi // 85c0 | test eax, eax $sequence_7 = { 50 ff15???????? 6a00 53 68???????? } // n = 5, score = 400 // 50 | push eax // ff15???????? | // 6a00 | push 0 // 53 | push ebx // 68???????? | $sequence_8 = { 57 8bf8 6a03 57 ffd6 85c0 } // n = 6, score = 400 // 57 | push edi // 8bf8 | mov edi, eax // 6a03 | push 3 // 57 | push edi // ffd6 | call esi // 85c0 | test eax, eax $sequence_9 = { ff15???????? 6a64 ff15???????? 5f 5e 33c0 5b } // n = 7, score = 400 // ff15???????? | // 6a64 | push 0x64 // ff15???????? | // 5f | pop edi // 5e | pop esi // 33c0 | xor eax, eax // 5b | pop ebx condition: 7 of them and filesize < 180224 }
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