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rule win_mortalkombat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.mortalkombat." 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.mortalkombat" 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 = { ff7508 6a17 681d010000 6a14 6a05 68???????? } // n = 6, score = 100 // ff7508 | push dword ptr [ebp + 8] // 6a17 | push 0x17 // 681d010000 | push 0x11d // 6a14 | push 0x14 // 6a05 | push 5 // 68???????? | $sequence_1 = { 8945f0 50 6a00 e8???????? 0bc0 7502 c9 } // n = 7, score = 100 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 50 | push eax // 6a00 | push 0 // e8???????? | // 0bc0 | or eax, eax // 7502 | jne 4 // c9 | leave $sequence_2 = { 803d????????01 7519 68???????? 68???????? 68???????? 6802000080 e8???????? } // n = 7, score = 100 // 803d????????01 | // 7519 | jne 0x1b // 68???????? | // 68???????? | // 68???????? | // 6802000080 | push 0x80000002 // e8???????? | $sequence_3 = { 55 8bec 6a00 ff35???????? ff7520 ff751c } // n = 6, score = 100 // 55 | push ebp // 8bec | mov ebp, esp // 6a00 | push 0 // ff35???????? | // ff7520 | push dword ptr [ebp + 0x20] // ff751c | push dword ptr [ebp + 0x1c] $sequence_4 = { 6a02 6800000040 68???????? e8???????? a3???????? ff35???????? e8???????? } // n = 7, score = 100 // 6a02 | push 2 // 6800000040 | push 0x40000000 // 68???????? | // e8???????? | // a3???????? | // ff35???????? | // e8???????? | $sequence_5 = { a3???????? 6a0a ff35???????? 6a00 ff35???????? e8???????? 55 } // n = 7, score = 100 // a3???????? | // 6a0a | push 0xa // ff35???????? | // 6a00 | push 0 // ff35???????? | // e8???????? | // 55 | push ebp $sequence_6 = { 85c0 0f8432030000 8d85e8feffff 50 68???????? e8???????? } // n = 6, score = 100 // 85c0 | test eax, eax // 0f8432030000 | je 0x338 // 8d85e8feffff | lea eax, [ebp - 0x118] // 50 | push eax // 68???????? | // e8???????? | $sequence_7 = { e9???????? e8???????? 8d85e8feffff 50 68???????? e8???????? } // n = 6, score = 100 // e9???????? | // e8???????? | // 8d85e8feffff | lea eax, [ebp - 0x118] // 50 | push eax // 68???????? | // e8???????? | $sequence_8 = { c6805044400000 8d85e8feffff 50 68???????? e8???????? 68???????? } // n = 6, score = 100 // c6805044400000 | mov byte ptr [eax + 0x404450], 0 // 8d85e8feffff | lea eax, [ebp - 0x118] // 50 | push eax // 68???????? | // e8???????? | // 68???????? | $sequence_9 = { 8915???????? 8b4808 8b500c 0fc9 0fca 890d???????? 8915???????? } // n = 7, score = 100 // 8915???????? | // 8b4808 | mov ecx, dword ptr [eax + 8] // 8b500c | mov edx, dword ptr [eax + 0xc] // 0fc9 | bswap ecx // 0fca | bswap edx // 890d???????? | // 8915???????? | condition: 7 of them and filesize < 1224704 }
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