Actor(s): Energetic Bear
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rule win_karagany_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 8d85a4fdffff 50 ffd6 68???????? } // n = 4, score = 400 // 8d85a4fdffff | lea eax, [ebp - 0x25c] // 50 | push eax // ffd6 | call esi // 68???????? | $sequence_1 = { 894ddc 894de4 894df0 894df8 894dfc } // n = 5, 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 // 894dfc | mov dword ptr [ebp - 4], ecx $sequence_2 = { 57 8bf8 6a03 57 ffd6 } // n = 5, score = 400 // 57 | push edi // 8bf8 | mov edi, eax // 6a03 | push 3 // 57 | push edi // ffd6 | call esi $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 = { 6800300000 6800000300 6a00 ff15???????? } // n = 4, score = 400 // 6800300000 | push 0x3000 // 6800000300 | push 0x30000 // 6a00 | push 0 // ff15???????? | $sequence_5 = { 8bf8 6a03 57 ffd6 85c0 } // n = 5, score = 400 // 8bf8 | mov edi, eax // 6a03 | push 3 // 57 | push edi // ffd6 | call esi // 85c0 | test eax, eax $sequence_6 = { 8b35???????? 57 8bf8 6a03 } // n = 4, score = 400 // 8b35???????? | // 57 | push edi // 8bf8 | mov edi, eax // 6a03 | push 3 $sequence_7 = { 6a40 6800300000 6800000300 6a00 ff15???????? } // n = 5, score = 400 // 6a40 | push 0x40 // 6800300000 | push 0x3000 // 6800000300 | push 0x30000 // 6a00 | push 0 // ff15???????? | $sequence_8 = { 6a03 53 ffd6 85c0 } // n = 4, score = 400 // 6a03 | push 3 // 53 | push ebx // ffd6 | call esi // 85c0 | test eax, eax $sequence_9 = { 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 condition: 7 of them and filesize < 180224 }
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