Actor(s): Energetic Bear
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rule win_karagany_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { bb???????? 8bc7 e8???????? 85c0 } // n = 4, score = 400 // bb???????? | // 8bc7 | mov eax, edi // e8???????? | // 85c0 | test eax, eax $sequence_1 = { 8b35???????? 57 8bf8 6a03 57 ffd6 } // n = 6, score = 400 // 8b35???????? | // 57 | push edi // 8bf8 | mov edi, eax // 6a03 | push 3 // 57 | push edi // ffd6 | call esi $sequence_2 = { 56 8b35???????? 57 8bf8 6a03 } // n = 5, score = 400 // 56 | push esi // 8b35???????? | // 57 | push edi // 8bf8 | mov edi, eax // 6a03 | push 3 $sequence_3 = { 57 8bf8 6a03 57 } // n = 4, score = 400 // 57 | push edi // 8bf8 | mov edi, eax // 6a03 | push 3 // 57 | push edi $sequence_4 = { 6a64 ff15???????? 5f 5e 33c0 5b 8be5 } // n = 7, score = 400 // 6a64 | push 0x64 // ff15???????? | // 5f | pop edi // 5e | pop esi // 33c0 | xor eax, eax // 5b | pop ebx // 8be5 | mov esp, ebp $sequence_5 = { c745a444000000 e8???????? 83c40c 8d45ec } // n = 4, score = 400 // c745a444000000 | mov dword ptr [ebp - 0x5c], 0x44 // e8???????? | // 83c40c | add esp, 0xc // 8d45ec | lea eax, [ebp - 0x14] $sequence_6 = { 55 8bec 81ec60060000 53 56 57 33c0 } // n = 7, score = 400 // 55 | push ebp // 8bec | mov ebp, esp // 81ec60060000 | sub esp, 0x660 // 53 | push ebx // 56 | push esi // 57 | push edi // 33c0 | xor eax, eax $sequence_7 = { 6a03 57 ffd6 85c0 } // n = 4, score = 400 // 6a03 | push 3 // 57 | push edi // ffd6 | call esi // 85c0 | test eax, eax $sequence_8 = { 894ddc 894de4 894df0 894df8 } // n = 4, score = 400 // 894ddc | mov dword ptr [ebp - 0x24], ecx // 894de4 | mov dword ptr [ebp - 0x1c], ecx // 894df0 | mov dword ptr [ebp - 0x10], ecx // 894df8 | mov dword ptr [ebp - 8], ecx $sequence_9 = { 8945d0 8945d8 8945e0 8945e8 8945ec 8945f4 } // n = 6, score = 400 // 8945d0 | mov dword ptr [ebp - 0x30], eax // 8945d8 | mov dword ptr [ebp - 0x28], eax // 8945e0 | mov dword ptr [ebp - 0x20], eax // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8945ec | mov dword ptr [ebp - 0x14], eax // 8945f4 | mov dword ptr [ebp - 0xc], eax condition: 7 of them and filesize < 180224 }
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