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rule win_manitsme_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 57 6a5a e8???????? 83c404 68905f0100 } // n = 5, score = 100 // 57 | push edi // 6a5a | push 0x5a // e8???????? | // 83c404 | add esp, 4 // 68905f0100 | push 0x15f90 $sequence_1 = { 51 52 ff15???????? 85c0 0f855effffff 8b8c242c080000 } // n = 6, score = 100 // 51 | push ecx // 52 | push edx // ff15???????? | // 85c0 | test eax, eax // 0f855effffff | jne 0xffffff64 // 8b8c242c080000 | mov ecx, dword ptr [esp + 0x82c] $sequence_2 = { ff75e4 ff75e0 ff15???????? c9 c20800 57 } // n = 6, score = 100 // ff75e4 | push dword ptr [ebp - 0x1c] // ff75e0 | push dword ptr [ebp - 0x20] // ff15???????? | // c9 | leave // c20800 | ret 8 // 57 | push edi $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 = { 8944242c e8???????? 8be8 83c410 3bef } // n = 5, score = 100 // 8944242c | mov dword ptr [esp + 0x2c], eax // e8???????? | // 8be8 | mov ebp, eax // 83c410 | add esp, 0x10 // 3bef | cmp ebp, edi $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 = { 8b15???????? 8b35???????? 33ff 8d442408 50 57 68???????? } // n = 7, score = 100 // 8b15???????? | // 8b35???????? | // 33ff | xor edi, edi // 8d442408 | lea eax, [esp + 8] // 50 | push eax // 57 | push edi // 68???????? | $sequence_7 = { ffd6 8b442408 3bc7 0f8483000000 50 } // n = 5, score = 100 // ffd6 | call esi // 8b442408 | mov eax, dword ptr [esp + 8] // 3bc7 | cmp eax, edi // 0f8483000000 | je 0x89 // 50 | push eax $sequence_8 = { 8844244f ff15???????? 83f8ff a3???????? 0f843c020000 8b3d???????? } // n = 6, score = 100 // 8844244f | mov byte ptr [esp + 0x4f], al // ff15???????? | // 83f8ff | cmp eax, -1 // a3???????? | // 0f843c020000 | je 0x242 // 8b3d???????? | $sequence_9 = { 50 ff15???????? ff15???????? 68dc050000 ff15???????? } // n = 5, score = 100 // 50 | push eax // ff15???????? | // ff15???????? | // 68dc050000 | push 0x5dc // ff15???????? | condition: 7 of them and filesize < 212992 }
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