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rule win_kegotip_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 6a00 8d8dd8feffff 51 ff15???????? c745f80040e428 c745fc80050000 } // n = 6, score = 600 // 6a00 | push 0 // 8d8dd8feffff | lea ecx, [ebp - 0x128] // 51 | push ecx // ff15???????? | // c745f80040e428 | mov dword ptr [ebp - 8], 0x28e44000 // c745fc80050000 | mov dword ptr [ebp - 4], 0x580 $sequence_1 = { 8b45f8 2d???????? 8845ff 8b4d08 83c101 } // n = 5, score = 600 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 2d???????? | // 8845ff | mov byte ptr [ebp - 1], al // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 83c101 | add ecx, 1 $sequence_2 = { 3b4514 7304 33c0 eb58 c745fc00000000 c745f800000000 } // n = 6, score = 600 // 3b4514 | cmp eax, dword ptr [ebp + 0x14] // 7304 | jae 6 // 33c0 | xor eax, eax // eb58 | jmp 0x5a // c745fc00000000 | mov dword ptr [ebp - 4], 0 // c745f800000000 | mov dword ptr [ebp - 8], 0 $sequence_3 = { e8???????? 83c404 3945f4 733a } // n = 4, score = 600 // e8???????? | // 83c404 | add esp, 4 // 3945f4 | cmp dword ptr [ebp - 0xc], eax // 733a | jae 0x3c $sequence_4 = { eb05 83c8ff eb1e 6a10 } // n = 4, score = 600 // eb05 | jmp 7 // 83c8ff | or eax, 0xffffffff // eb1e | jmp 0x20 // 6a10 | push 0x10 $sequence_5 = { c785e8feffff04010000 6a00 6a00 6a00 6a00 8d95e8feffff } // n = 6, score = 600 // c785e8feffff04010000 | mov dword ptr [ebp - 0x118], 0x104 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 8d95e8feffff | lea edx, [ebp - 0x118] $sequence_6 = { 8b4508 f7400406000000 0f859e000000 8945f8 8b4510 8945fc 8d45f8 } // n = 7, score = 600 // 8b4508 | mov eax, dword ptr [ebp + 8] // f7400406000000 | test dword ptr [eax + 4], 6 // 0f859e000000 | jne 0xa4 // 8945f8 | mov dword ptr [ebp - 8], eax // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 8945fc | mov dword ptr [ebp - 4], eax // 8d45f8 | lea eax, [ebp - 8] $sequence_7 = { e8???????? 83c40c c68567feffff00 8d8578feffff } // n = 4, score = 600 // e8???????? | // 83c40c | add esp, 0xc // c68567feffff00 | mov byte ptr [ebp - 0x199], 0 // 8d8578feffff | lea eax, [ebp - 0x188] $sequence_8 = { ff15???????? c645ff01 8b45f0 50 ff15???????? } // n = 5, score = 600 // ff15???????? | // c645ff01 | mov byte ptr [ebp - 1], 1 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 50 | push eax // ff15???????? | $sequence_9 = { 6a00 8d55fc 52 e8???????? 83c40c } // n = 5, score = 600 // 6a00 | push 0 // 8d55fc | lea edx, [ebp - 4] // 52 | push edx // e8???????? | // 83c40c | add esp, 0xc condition: 7 of them and filesize < 278528 }
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