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rule win_kelihos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { f357 0010 865300 10d7 57 0010 015300 } // n = 7, score = 300 // f357 | push edi // 0010 | add byte ptr [eax], dl // 865300 | xchg byte ptr [ebx], dl // 10d7 | adc bh, dl // 57 | push edi // 0010 | add byte ptr [eax], dl // 015300 | add dword ptr [ebx], edx $sequence_1 = { e8???????? 68???????? 8d8d60ffffff e8???????? 68???????? 8d8d7cffffff c745fc09000000 } // n = 7, score = 300 // e8???????? | // 68???????? | // 8d8d60ffffff | lea ecx, [ebp - 0xa0] // e8???????? | // 68???????? | // 8d8d7cffffff | lea ecx, [ebp - 0x84] // c745fc09000000 | mov dword ptr [ebp - 4], 9 $sequence_2 = { c20800 55 8bec 83ec14 53 56 8b37 } // n = 7, score = 300 // c20800 | ret 8 // 55 | push ebp // 8bec | mov ebp, esp // 83ec14 | sub esp, 0x14 // 53 | push ebx // 56 | push esi // 8b37 | mov esi, dword ptr [edi] $sequence_3 = { c9 c20400 833d????????00 53 56 57 8b7c2418 } // n = 7, score = 300 // c9 | leave // c20400 | ret 4 // 833d????????00 | // 53 | push ebx // 56 | push esi // 57 | push edi // 8b7c2418 | mov edi, dword ptr [esp + 0x18] $sequence_4 = { eb02 33f6 e8???????? 8b0d???????? 8b15???????? 8b0491 8b4810 } // n = 7, score = 300 // eb02 | jmp 4 // 33f6 | xor esi, esi // e8???????? | // 8b0d???????? | // 8b15???????? | // 8b0491 | mov eax, dword ptr [ecx + edx*4] // 8b4810 | mov ecx, dword ptr [eax + 0x10] $sequence_5 = { e8???????? 8b4614 8b00 8b0e 57 ff7508 ff75fc } // n = 7, score = 300 // e8???????? | // 8b4614 | mov eax, dword ptr [esi + 0x14] // 8b00 | mov eax, dword ptr [eax] // 8b0e | mov ecx, dword ptr [esi] // 57 | push edi // ff7508 | push dword ptr [ebp + 8] // ff75fc | push dword ptr [ebp - 4] $sequence_6 = { ff15???????? 8bf0 83c408 85f6 7447 56 56 } // n = 7, score = 300 // ff15???????? | // 8bf0 | mov esi, eax // 83c408 | add esp, 8 // 85f6 | test esi, esi // 7447 | je 0x49 // 56 | push esi // 56 | push esi $sequence_7 = { ff742408 51 e8???????? b001 c3 32c0 c3 } // n = 7, score = 300 // ff742408 | push dword ptr [esp + 8] // 51 | push ecx // e8???????? | // b001 | mov al, 1 // c3 | ret // 32c0 | xor al, al // c3 | ret $sequence_8 = { e8???????? 8d8de8fdffff e8???????? 8d85e8fdffff 50 c645fc02 e8???????? } // n = 7, score = 300 // e8???????? | // 8d8de8fdffff | lea ecx, [ebp - 0x218] // e8???????? | // 8d85e8fdffff | lea eax, [ebp - 0x218] // 50 | push eax // c645fc02 | mov byte ptr [ebp - 4], 2 // e8???????? | $sequence_9 = { ff55e8 8b4d10 83c410 3bf7 8b3d???????? 8901 7403 } // n = 7, score = 300 // ff55e8 | call dword ptr [ebp - 0x18] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 83c410 | add esp, 0x10 // 3bf7 | cmp esi, edi // 8b3d???????? | // 8901 | mov dword ptr [ecx], eax // 7403 | je 5 condition: 7 of them and filesize < 4702208 }
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