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rule win_manitsme_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.manitsme." 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.manitsme" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 3c3b 750b 56 e8???????? 83c404 8be8 } // n = 6, score = 100 // 3c3b | cmp al, 0x3b // 750b | jne 0xd // 56 | push esi // e8???????? | // 83c404 | add esp, 4 // 8be8 | mov ebp, eax $sequence_1 = { 7404 3c3b 750b 56 e8???????? 83c404 8be8 } // n = 7, score = 100 // 7404 | je 6 // 3c3b | cmp al, 0x3b // 750b | jne 0xd // 56 | push esi // e8???????? | // 83c404 | add esp, 4 // 8be8 | mov ebp, eax $sequence_2 = { 83c404 52 ffd5 e9???????? 68bb010000 66c74424180200 } // n = 6, score = 100 // 83c404 | add esp, 4 // 52 | push edx // ffd5 | call ebp // e9???????? | // 68bb010000 | push 0x1bb // 66c74424180200 | mov word ptr [esp + 0x18], 2 $sequence_3 = { ff15???????? a1???????? 6a01 50 8bf0 } // n = 5, score = 100 // ff15???????? | // a1???????? | // 6a01 | push 1 // 50 | push eax // 8bf0 | mov esi, eax $sequence_4 = { 6a02 68???????? be07000000 e8???????? } // n = 4, score = 100 // 6a02 | push 2 // 68???????? | // be07000000 | mov esi, 7 // e8???????? | $sequence_5 = { 74e8 8a17 0fb6ca 0fbe8960420110 85c9 750d } // n = 6, score = 100 // 74e8 | je 0xffffffea // 8a17 | mov dl, byte ptr [edi] // 0fb6ca | movzx ecx, dl // 0fbe8960420110 | movsx ecx, byte ptr [ecx + 0x10014260] // 85c9 | test ecx, ecx // 750d | jne 0xf $sequence_6 = { 83c404 6868010000 e8???????? 83c404 68407e0500 e8???????? } // n = 6, score = 100 // 83c404 | add esp, 4 // 6868010000 | push 0x168 // e8???????? | // 83c404 | add esp, 4 // 68407e0500 | push 0x57e40 // e8???????? | $sequence_7 = { 52 ff15???????? 8b8c242c020000 5f 5e } // n = 5, score = 100 // 52 | push edx // ff15???????? | // 8b8c242c020000 | mov ecx, dword ptr [esp + 0x22c] // 5f | pop edi // 5e | pop esi $sequence_8 = { ffd3 85c0 7586 50 ff15???????? } // n = 5, score = 100 // ffd3 | call ebx // 85c0 | test eax, eax // 7586 | jne 0xffffff88 // 50 | push eax // ff15???????? | $sequence_9 = { 8bc7 c1f805 8bcf 83e11f 6bc928 8b048540580110 } // n = 6, score = 100 // 8bc7 | mov eax, edi // c1f805 | sar eax, 5 // 8bcf | mov ecx, edi // 83e11f | and ecx, 0x1f // 6bc928 | imul ecx, ecx, 0x28 // 8b048540580110 | mov eax, dword ptr [eax*4 + 0x10015840] condition: 7 of them and filesize < 212992 }
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