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rule win_cherry_picker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { ffd6 68???????? 6800010000 68???????? 68???????? } // n = 5, score = 300 // ffd6 | call esi // 68???????? | // 6800010000 | push 0x100 // 68???????? | // 68???????? | $sequence_1 = { 68???????? 6a3c 68???????? 68???????? a3???????? } // n = 5, score = 300 // 68???????? | // 6a3c | push 0x3c // 68???????? | // 68???????? | // a3???????? | $sequence_2 = { 8bf0 0fbec9 81e6ff000000 33f1 8a4a01 42 c1f808 } // n = 7, score = 300 // 8bf0 | mov esi, eax // 0fbec9 | movsx ecx, cl // 81e6ff000000 | and esi, 0xff // 33f1 | xor esi, ecx // 8a4a01 | mov cl, byte ptr [edx + 1] // 42 | inc edx // c1f808 | sar eax, 8 $sequence_3 = { 8bd1 83c408 2bf2 8a11 88140e } // n = 5, score = 300 // 8bd1 | mov edx, ecx // 83c408 | add esp, 8 // 2bf2 | sub esi, edx // 8a11 | mov dl, byte ptr [ecx] // 88140e | mov byte ptr [esi + ecx], dl $sequence_4 = { 8817 47 41 81fefa000000 } // n = 4, score = 300 // 8817 | mov byte ptr [edi], dl // 47 | inc edi // 41 | inc ecx // 81fefa000000 | cmp esi, 0xfa $sequence_5 = { 57 6aff 50 ffd3 6a00 6a00 } // n = 6, score = 300 // 57 | push edi // 6aff | push -1 // 50 | push eax // ffd3 | call ebx // 6a00 | push 0 // 6a00 | push 0 $sequence_6 = { 68???????? 68???????? 68???????? 68???????? ffd6 68???????? 6800010000 } // n = 7, score = 300 // 68???????? | // 68???????? | // 68???????? | // 68???????? | // ffd6 | call esi // 68???????? | // 6800010000 | push 0x100 $sequence_7 = { 893d???????? e8???????? a1???????? 50 ff15???????? } // n = 5, score = 300 // 893d???????? | // e8???????? | // a1???????? | // 50 | push eax // ff15???????? | $sequence_8 = { 6a64 68???????? 68???????? a3???????? ffd6 68???????? 6a3c } // n = 7, score = 300 // 6a64 | push 0x64 // 68???????? | // 68???????? | // a3???????? | // ffd6 | call esi // 68???????? | // 6a3c | push 0x3c $sequence_9 = { 50 ffd3 6a00 6a00 6a03 } // n = 5, score = 300 // 50 | push eax // ffd3 | call ebx // 6a00 | push 0 // 6a00 | push 0 // 6a03 | push 3 condition: 7 of them and filesize < 712704 }
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