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rule win_cherry_picker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.cherry_picker." 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.cherry_picker" 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 = { 68???????? 68???????? a3???????? ffd6 69c0e8030000 68???????? } // n = 6, score = 300 // 68???????? | // 68???????? | // a3???????? | // ffd6 | call esi // 69c0e8030000 | imul eax, eax, 0x3e8 // 68???????? | $sequence_1 = { 80fa3b 7503 83c9ff 8817 47 } // n = 5, score = 300 // 80fa3b | cmp dl, 0x3b // 7503 | jne 5 // 83c9ff | or ecx, 0xffffffff // 8817 | mov byte ptr [edi], dl // 47 | inc edi $sequence_2 = { 68???????? 56 89442420 ffd3 68???????? 56 } // n = 6, score = 300 // 68???????? | // 56 | push esi // 89442420 | mov dword ptr [esp + 0x20], eax // ffd3 | call ebx // 68???????? | // 56 | push esi $sequence_3 = { 8bf0 0fbec9 81e6ff000000 33f1 } // n = 4, score = 300 // 8bf0 | mov esi, eax // 0fbec9 | movsx ecx, cl // 81e6ff000000 | and esi, 0xff // 33f1 | xor esi, ecx $sequence_4 = { a1???????? 53 8b1d???????? 56 57 6aff } // n = 6, score = 300 // a1???????? | // 53 | push ebx // 8b1d???????? | // 56 | push esi // 57 | push edi // 6aff | push -1 $sequence_5 = { a3???????? 85c0 7512 68???????? 50 50 } // n = 6, score = 300 // a3???????? | // 85c0 | test eax, eax // 7512 | jne 0x14 // 68???????? | // 50 | push eax // 50 | push eax $sequence_6 = { ff15???????? 8bf0 68???????? 56 ffd3 68???????? 56 } // n = 7, score = 300 // ff15???????? | // 8bf0 | mov esi, eax // 68???????? | // 56 | push esi // ffd3 | call ebx // 68???????? | // 56 | push esi $sequence_7 = { 6800010000 68???????? 68???????? 68???????? 68???????? ffd6 68???????? } // n = 7, score = 300 // 6800010000 | push 0x100 // 68???????? | // 68???????? | // 68???????? | // 68???????? | // ffd6 | call esi // 68???????? | $sequence_8 = { a1???????? 56 6aff 50 8bf1 } // n = 5, score = 300 // a1???????? | // 56 | push esi // 6aff | push -1 // 50 | push eax // 8bf1 | mov esi, ecx $sequence_9 = { ffd6 68???????? 6800010000 68???????? } // n = 4, score = 300 // ffd6 | call esi // 68???????? | // 6800010000 | push 0x100 // 68???????? | condition: 7 of them and filesize < 712704 }
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