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rule win_treasurehunter_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.treasurehunter." 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.treasurehunter" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { ff35???????? ff15???????? ebe5 56 } // n = 4, score = 300 // ff35???????? | // ff15???????? | // ebe5 | jmp 0xffffffe7 // 56 | push esi $sequence_1 = { 8d85e0d6ffff 50 6800142d00 53 ff15???????? 85c0 } // n = 6, score = 300 // 8d85e0d6ffff | lea eax, dword ptr [ebp - 0x2920] // 50 | push eax // 6800142d00 | push 0x2d1400 // 53 | push ebx // ff15???????? | // 85c0 | test eax, eax $sequence_2 = { 8955fc e8???????? 8bce 8bf8 e8???????? } // n = 5, score = 300 // 8955fc | mov dword ptr [ebp - 4], edx // e8???????? | // 8bce | mov ecx, esi // 8bf8 | mov edi, eax // e8???????? | $sequence_3 = { 56 50 8903 ff15???????? 8b4dfc } // n = 5, score = 300 // 56 | push esi // 50 | push eax // 8903 | mov dword ptr [ebx], eax // ff15???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_4 = { 85d2 7e0b 4a e8???????? 0fafc6 5e } // n = 6, score = 300 // 85d2 | test edx, edx // 7e0b | jle 0xd // 4a | dec edx // e8???????? | // 0fafc6 | imul eax, esi // 5e | pop esi $sequence_5 = { 41 83f921 7cf3 8b15???????? 8b0d???????? 6a07 } // n = 6, score = 300 // 41 | inc ecx // 83f921 | cmp ecx, 0x21 // 7cf3 | jl 0xfffffff5 // 8b15???????? | // 8b0d???????? | // 6a07 | push 7 $sequence_6 = { 8b4dfc 57 8901 e8???????? } // n = 4, score = 300 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 57 | push edi // 8901 | mov dword ptr [ecx], eax // e8???????? | $sequence_7 = { e8???????? 83c40c be???????? ff36 57 } // n = 5, score = 300 // e8???????? | // 83c40c | add esp, 0xc // be???????? | // ff36 | push dword ptr [esi] // 57 | push edi condition: 7 of them and filesize < 229376 }
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