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rule win_treasurehunter_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 83c40c be???????? ff36 57 e8???????? } // n = 5, score = 300 // 83c40c | add esp, 0xc // be???????? | // ff36 | push dword ptr [esi] // 57 | push edi // e8???????? | $sequence_1 = { e8???????? 0fafc6 5e c3 } // n = 4, score = 300 // e8???????? | // 0fafc6 | imul eax, esi // 5e | pop esi // c3 | ret $sequence_2 = { ff15???????? 8b4dfc 57 8901 e8???????? 56 } // n = 6, score = 300 // ff15???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 57 | push edi // 8901 | mov dword ptr [ecx], eax // e8???????? | // 56 | push esi $sequence_3 = { 56 8b35???????? 8bd9 8b4d08 57 8955fc } // n = 6, score = 300 // 56 | push esi // 8b35???????? | // 8bd9 | mov ebx, ecx // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 57 | push edi // 8955fc | mov dword ptr [ebp - 4], edx $sequence_4 = { 50 6a0c 8d85e0d6ffff 50 6800142d00 53 ff15???????? } // n = 7, score = 300 // 50 | push eax // 6a0c | push 0xc // 8d85e0d6ffff | lea eax, [ebp - 0x2920] // 50 | push eax // 6800142d00 | push 0x2d1400 // 53 | push ebx // ff15???????? | $sequence_5 = { 6a50 56 50 8903 ff15???????? } // n = 5, score = 300 // 6a50 | push 0x50 // 56 | push esi // 50 | push eax // 8903 | mov dword ptr [ebx], eax // ff15???????? | $sequence_6 = { 84c9 75f9 2bf0 e8???????? 8bd0 } // n = 5, score = 300 // 84c9 | test cl, cl // 75f9 | jne 0xfffffffb // 2bf0 | sub esi, eax // e8???????? | // 8bd0 | mov edx, eax $sequence_7 = { 50 56 53 8945fc ff15???????? } // n = 5, score = 300 // 50 | push eax // 56 | push esi // 53 | push ebx // 8945fc | mov dword ptr [ebp - 4], eax // ff15???????? | condition: 7 of them and filesize < 229376 }
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