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rule win_kegotip_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.kegotip." 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.kegotip" 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 = { 83f80a 7502 eb2a 8b4d20 038d3cf9ffff 8b9540f9ffff 039538f9ffff } // n = 7, score = 600 // 83f80a | cmp eax, 0xa // 7502 | jne 4 // eb2a | jmp 0x2c // 8b4d20 | mov ecx, dword ptr [ebp + 0x20] // 038d3cf9ffff | add ecx, dword ptr [ebp - 0x6c4] // 8b9540f9ffff | mov edx, dword ptr [ebp - 0x6c0] // 039538f9ffff | add edx, dword ptr [ebp - 0x6c8] $sequence_1 = { 7324 8b5510 0355e4 8b45f4 } // n = 4, score = 600 // 7324 | jae 0x26 // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 0355e4 | add edx, dword ptr [ebp - 0x1c] // 8b45f4 | mov eax, dword ptr [ebp - 0xc] $sequence_2 = { ebba 8b55d8 0355d4 8955d8 } // n = 4, score = 600 // ebba | jmp 0xffffffbc // 8b55d8 | mov edx, dword ptr [ebp - 0x28] // 0355d4 | add edx, dword ptr [ebp - 0x2c] // 8955d8 | mov dword ptr [ebp - 0x28], edx $sequence_3 = { 03550c 0fb642ff 50 e8???????? 83c404 0fb6c8 85c9 } // n = 7, score = 600 // 03550c | add edx, dword ptr [ebp + 0xc] // 0fb642ff | movzx eax, byte ptr [edx - 1] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 0fb6c8 | movzx ecx, al // 85c9 | test ecx, ecx $sequence_4 = { 8b450c 8b4dfc 8908 6a00 8b55f4 } // n = 5, score = 600 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 8908 | mov dword ptr [eax], ecx // 6a00 | push 0 // 8b55f4 | mov edx, dword ptr [ebp - 0xc] $sequence_5 = { eb09 8b55fc 83c201 8955fc 837dfc04 7d37 8b45f8 } // n = 7, score = 600 // eb09 | jmp 0xb // 8b55fc | mov edx, dword ptr [ebp - 4] // 83c201 | add edx, 1 // 8955fc | mov dword ptr [ebp - 4], edx // 837dfc04 | cmp dword ptr [ebp - 4], 4 // 7d37 | jge 0x39 // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_6 = { 734e ff15???????? 33d2 b9fa000000 } // n = 4, score = 600 // 734e | jae 0x50 // ff15???????? | // 33d2 | xor edx, edx // b9fa000000 | mov ecx, 0xfa $sequence_7 = { c745fc00000000 c745f800000000 eb09 8b4df8 83c101 894df8 8b5510 } // n = 7, score = 600 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // c745f800000000 | mov dword ptr [ebp - 8], 0 // eb09 | jmp 0xb // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 83c101 | add ecx, 1 // 894df8 | mov dword ptr [ebp - 8], ecx // 8b5510 | mov edx, dword ptr [ebp + 0x10] $sequence_8 = { 7619 8b8554fdffff 8945fc 8b4d10 898d58feffff } // n = 5, score = 600 // 7619 | jbe 0x1b // 8b8554fdffff | mov eax, dword ptr [ebp - 0x2ac] // 8945fc | mov dword ptr [ebp - 4], eax // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 898d58feffff | mov dword ptr [ebp - 0x1a8], ecx $sequence_9 = { 2b4d84 790c c7856cffffff00000000 eb0c } // n = 4, score = 600 // 2b4d84 | sub ecx, dword ptr [ebp - 0x7c] // 790c | jns 0xe // c7856cffffff00000000 | mov dword ptr [ebp - 0x94], 0 // eb0c | jmp 0xe condition: 7 of them and filesize < 278528 }
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