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rule win_manitsme_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 8b55fc 83e61f 6bf628 c1fa05 8b149540580110 } // n = 5, score = 100 // 8b55fc | mov edx, dword ptr [ebp - 4] // 83e61f | and esi, 0x1f // 6bf628 | imul esi, esi, 0x28 // c1fa05 | sar edx, 5 // 8b149540580110 | mov edx, dword ptr [edx*4 + 0x10015840] $sequence_1 = { 68fc030000 8d4c2420 51 50 ff15???????? 8b7c2410 33c0 } // n = 7, score = 100 // 68fc030000 | push 0x3fc // 8d4c2420 | lea ecx, [esp + 0x20] // 51 | push ecx // 50 | push eax // ff15???????? | // 8b7c2410 | mov edi, dword ptr [esp + 0x10] // 33c0 | xor eax, eax $sequence_2 = { 33c0 8945e4 3d00010000 7d10 8a8c181d010000 888850330110 } // n = 6, score = 100 // 33c0 | xor eax, eax // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 3d00010000 | cmp eax, 0x100 // 7d10 | jge 0x12 // 8a8c181d010000 | mov cl, byte ptr [eax + ebx + 0x11d] // 888850330110 | mov byte ptr [eax + 0x10013350], cl $sequence_3 = { e8???????? 83c404 e8???????? 33d2 b9302a0000 f7f1 69d2e8030000 } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // e8???????? | // 33d2 | xor edx, edx // b9302a0000 | mov ecx, 0x2a30 // f7f1 | div ecx // 69d2e8030000 | imul edx, edx, 0x3e8 $sequence_4 = { 66c74424180200 ff15???????? 8d542424 52 668944241a ff15???????? 89442418 } // n = 7, score = 100 // 66c74424180200 | mov word ptr [esp + 0x18], 2 // ff15???????? | // 8d542424 | lea edx, [esp + 0x24] // 52 | push edx // 668944241a | mov word ptr [esp + 0x1a], ax // ff15???????? | // 89442418 | mov dword ptr [esp + 0x18], eax $sequence_5 = { 56 57 33f6 33ff 3b1cfdb83b0110 7406 } // n = 6, score = 100 // 56 | push esi // 57 | push edi // 33f6 | xor esi, esi // 33ff | xor edi, edi // 3b1cfdb83b0110 | cmp ebx, dword ptr [edi*8 + 0x10013bb8] // 7406 | je 8 $sequence_6 = { ff15???????? a3???????? 5e b801000000 c20c00 6a00 } // n = 6, score = 100 // ff15???????? | // a3???????? | // 5e | pop esi // b801000000 | mov eax, 1 // c20c00 | ret 0xc // 6a00 | push 0 $sequence_7 = { 5f 5b c9 c3 6a0a 6a00 ff74240c } // n = 7, score = 100 // 5f | pop edi // 5b | pop ebx // c9 | leave // c3 | ret // 6a0a | push 0xa // 6a00 | push 0 // ff74240c | push dword ptr [esp + 0xc] $sequence_8 = { 5d c3 56 57 33ff 8db7403e0110 ff36 } // n = 7, score = 100 // 5d | pop ebp // c3 | ret // 56 | push esi // 57 | push edi // 33ff | xor edi, edi // 8db7403e0110 | lea esi, [edi + 0x10013e40] // ff36 | push dword ptr [esi] $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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