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rule win_treasurehunter_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-29" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 50 8903 ff15???????? 8b4dfc } // n = 4, score = 300 // 50 | push eax // 8903 | mov dword ptr [ebx], eax // ff15???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_1 = { 53 56 8b35???????? 8bd9 8b4d08 57 } // n = 6, score = 300 // 53 | push ebx // 56 | push esi // 8b35???????? | // 8bd9 | mov ebx, ecx // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 57 | push edi $sequence_2 = { 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_3 = { 8d85e0f7ffff 50 6a00 6a00 68???????? } // n = 5, score = 300 // 8d85e0f7ffff | lea eax, [ebp - 0x820] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 68???????? | $sequence_4 = { 7e0b 4a e8???????? 0fafc6 5e c3 } // n = 6, score = 300 // 7e0b | jle 0xd // 4a | dec edx // e8???????? | // 0fafc6 | imul eax, esi // 5e | pop esi // c3 | ret $sequence_5 = { e8???????? 83c40c be???????? ff36 } // n = 4, score = 300 // e8???????? | // 83c40c | add esp, 0xc // be???????? | // ff36 | push dword ptr [esi] $sequence_6 = { 51 0f47c7 50 56 53 8945fc ff15???????? } // n = 7, score = 300 // 51 | push ecx // 0f47c7 | cmova eax, edi // 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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