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rule win_kelihos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { c20c00 6a10 e8???????? 59 85c0 7402 8900 } // n = 7, score = 300 // c20c00 | ret 0xc // 6a10 | push 0x10 // e8???????? | // 59 | pop ecx // 85c0 | test eax, eax // 7402 | je 4 // 8900 | mov dword ptr [eax], eax $sequence_1 = { e8???????? 85c0 0f8572010000 ffb4b5b8feffff 8d8d30ffffff e8???????? 8d45b8 } // n = 7, score = 300 // e8???????? | // 85c0 | test eax, eax // 0f8572010000 | jne 0x178 // ffb4b5b8feffff | push dword ptr [ebp + esi*4 - 0x148] // 8d8d30ffffff | lea ecx, [ebp - 0xd0] // e8???????? | // 8d45b8 | lea eax, [ebp - 0x48] $sequence_2 = { c6414801 b001 c3 55 8bec 83e4f8 6aff } // n = 7, score = 300 // c6414801 | mov byte ptr [ecx + 0x48], 1 // b001 | mov al, 1 // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 83e4f8 | and esp, 0xfffffff8 // 6aff | push -1 $sequence_3 = { e8???????? c745e401000000 8365fc00 8b45e4 0fa2 8b7d08 8907 } // n = 7, score = 300 // e8???????? | // c745e401000000 | mov dword ptr [ebp - 0x1c], 1 // 8365fc00 | and dword ptr [ebp - 4], 0 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 0fa2 | cpuid // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8907 | mov dword ptr [edi], eax $sequence_4 = { e8???????? 83c01c 56 8bc8 e8???????? 6a00 8d4d80 } // n = 7, score = 300 // e8???????? | // 83c01c | add eax, 0x1c // 56 | push esi // 8bc8 | mov ecx, eax // e8???????? | // 6a00 | push 0 // 8d4d80 | lea ecx, [ebp - 0x80] $sequence_5 = { 8b3cbb 8b4764 85c0 7502 8bc7 894664 8b3d???????? } // n = 7, score = 300 // 8b3cbb | mov edi, dword ptr [ebx + edi*4] // 8b4764 | mov eax, dword ptr [edi + 0x64] // 85c0 | test eax, eax // 7502 | jne 4 // 8bc7 | mov eax, edi // 894664 | mov dword ptr [esi + 0x64], eax // 8b3d???????? | $sequence_6 = { e8???????? 8d45b8 50 8d45d4 50 e8???????? 59 } // n = 7, score = 300 // e8???????? | // 8d45b8 | lea eax, [ebp - 0x48] // 50 | push eax // 8d45d4 | lea eax, [ebp - 0x2c] // 50 | push eax // e8???????? | // 59 | pop ecx $sequence_7 = { 8d8d5cffffff e9???????? 8d4594 e9???????? 8d4dd0 e9???????? 8d8d5cffffff } // n = 7, score = 300 // 8d8d5cffffff | lea ecx, [ebp - 0xa4] // e9???????? | // 8d4594 | lea eax, [ebp - 0x6c] // e9???????? | // 8d4dd0 | lea ecx, [ebp - 0x30] // e9???????? | // 8d8d5cffffff | lea ecx, [ebp - 0xa4] $sequence_8 = { e8???????? 83c424 8bc8 897c245c e8???????? 834c2450ff 8d44242c } // n = 7, score = 300 // e8???????? | // 83c424 | add esp, 0x24 // 8bc8 | mov ecx, eax // 897c245c | mov dword ptr [esp + 0x5c], edi // e8???????? | // 834c2450ff | or dword ptr [esp + 0x50], 0xffffffff // 8d44242c | lea eax, [esp + 0x2c] $sequence_9 = { c20400 56 8d7204 56 e8???????? 8d4210 c6808100000001 } // n = 7, score = 300 // c20400 | ret 4 // 56 | push esi // 8d7204 | lea esi, [edx + 4] // 56 | push esi // e8???????? | // 8d4210 | lea eax, [edx + 0x10] // c6808100000001 | mov byte ptr [eax + 0x81], 1 condition: 7 of them and filesize < 4702208 }
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