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rule win_kelihos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.kelihos." 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.kelihos" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { e8???????? 59 59 c644241701 84c0 7505 c644241700 } // n = 7, score = 300 // e8???????? | // 59 | pop ecx // 59 | pop ecx // c644241701 | mov byte ptr [esp + 0x17], 1 // 84c0 | test al, al // 7505 | jne 7 // c644241700 | mov byte ptr [esp + 0x17], 0 $sequence_1 = { ff7508 ff75fc ff7508 50 51 ff750c 56 } // n = 7, score = 300 // ff7508 | push dword ptr [ebp + 8] // ff75fc | push dword ptr [ebp - 4] // ff7508 | push dword ptr [ebp + 8] // 50 | push eax // 51 | push ecx // ff750c | push dword ptr [ebp + 0xc] // 56 | push esi $sequence_2 = { e8???????? 6a00 6a01 8d4dc0 e8???????? 8a45ef e8???????? } // n = 7, score = 300 // e8???????? | // 6a00 | push 0 // 6a01 | push 1 // 8d4dc0 | lea ecx, [ebp - 0x40] // e8???????? | // 8a45ef | mov al, byte ptr [ebp - 0x11] // e8???????? | $sequence_3 = { e8???????? b001 e8???????? c20800 6a18 b8???????? e8???????? } // n = 7, score = 300 // e8???????? | // b001 | mov al, 1 // e8???????? | // c20800 | ret 8 // 6a18 | push 0x18 // b8???????? | // e8???????? | $sequence_4 = { e8???????? 83c40c 53 6a01 8d8ddcfdffff e8???????? 53 } // n = 7, score = 300 // e8???????? | // 83c40c | add esp, 0xc // 53 | push ebx // 6a01 | push 1 // 8d8ddcfdffff | lea ecx, [ebp - 0x224] // e8???????? | // 53 | push ebx $sequence_5 = { e8???????? c645fc02 807dd800 0f84f7000000 8b06 8b4004 03c6 } // n = 7, score = 300 // e8???????? | // c645fc02 | mov byte ptr [ebp - 4], 2 // 807dd800 | cmp byte ptr [ebp - 0x28], 0 // 0f84f7000000 | je 0xfd // 8b06 | mov eax, dword ptr [esi] // 8b4004 | mov eax, dword ptr [eax + 4] // 03c6 | add eax, esi $sequence_6 = { ff75ac 8d7db8 895da8 e8???????? 83c40c 84c0 0f840b010000 } // n = 7, score = 300 // ff75ac | push dword ptr [ebp - 0x54] // 8d7db8 | lea edi, [ebp - 0x48] // 895da8 | mov dword ptr [ebp - 0x58], ebx // e8???????? | // 83c40c | add esp, 0xc // 84c0 | test al, al // 0f840b010000 | je 0x111 $sequence_7 = { 8b4d0c 8b5508 6a00 6a10 50 51 52 } // n = 7, score = 300 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8b5508 | mov edx, dword ptr [ebp + 8] // 6a00 | push 0 // 6a10 | push 0x10 // 50 | push eax // 51 | push ecx // 52 | push edx $sequence_8 = { c3 6a10 b8???????? e8???????? 8b7d08 33db 53 } // n = 7, score = 300 // c3 | ret // 6a10 | push 0x10 // b8???????? | // e8???????? | // 8b7d08 | mov edi, dword ptr [ebp + 8] // 33db | xor ebx, ebx // 53 | push ebx $sequence_9 = { e8???????? eb02 33c0 e8???????? c20400 83c1f8 8b01 } // n = 7, score = 300 // e8???????? | // eb02 | jmp 4 // 33c0 | xor eax, eax // e8???????? | // c20400 | ret 4 // 83c1f8 | add ecx, -8 // 8b01 | mov eax, dword ptr [ecx] condition: 7 of them and filesize < 4702208 }
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