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rule win_client_maximus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.client_maximus." 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.client_maximus" 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 = { 89f0 0fb6c0 0fb61403 88140b 83c101 89fa 81f900010000 } // n = 7, score = 300 // 89f0 | mov eax, esi // 0fb6c0 | movzx eax, al // 0fb61403 | movzx edx, byte ptr [ebx + eax] // 88140b | mov byte ptr [ebx + ecx], dl // 83c101 | add ecx, 1 // 89fa | mov edx, edi // 81f900010000 | cmp ecx, 0x100 $sequence_1 = { 89e5 56 53 83ec10 8b1d???????? } // n = 5, score = 300 // 89e5 | mov ebp, esp // 56 | push esi // 53 | push ebx // 83ec10 | sub esp, 0x10 // 8b1d???????? | $sequence_2 = { 893424 ff15???????? 83ec08 85c0 7411 } // n = 5, score = 300 // 893424 | mov dword ptr [esp], esi // ff15???????? | // 83ec08 | sub esp, 8 // 85c0 | test eax, eax // 7411 | je 0x13 $sequence_3 = { e8???????? 8b4304 85c0 741d 8b5330 c744240800800000 c744240400000000 } // n = 7, score = 300 // e8???????? | // 8b4304 | mov eax, dword ptr [ebx + 4] // 85c0 | test eax, eax // 741d | je 0x1f // 8b5330 | mov edx, dword ptr [ebx + 0x30] // c744240800800000 | mov dword ptr [esp + 8], 0x8000 // c744240400000000 | mov dword ptr [esp + 4], 0 $sequence_4 = { 39730c 7fe1 891424 e8???????? } // n = 4, score = 300 // 39730c | cmp dword ptr [ebx + 0xc], esi // 7fe1 | jg 0xffffffe3 // 891424 | mov dword ptr [esp], edx // e8???????? | $sequence_5 = { 7429 c70424???????? ff15???????? 83ec04 a3???????? } // n = 5, score = 300 // 7429 | je 0x2b // c70424???????? | // ff15???????? | // 83ec04 | sub esp, 4 // a3???????? | $sequence_6 = { 8b4628 85c0 7535 c70424???????? } // n = 4, score = 300 // 8b4628 | mov eax, dword ptr [esi + 0x28] // 85c0 | test eax, eax // 7535 | jne 0x37 // c70424???????? | $sequence_7 = { a3???????? c7442404???????? 893424 ff15???????? 83ec08 85c0 7411 } // n = 7, score = 300 // a3???????? | // c7442404???????? | // 893424 | mov dword ptr [esp], esi // ff15???????? | // 83ec08 | sub esp, 8 // 85c0 | test eax, eax // 7411 | je 0x13 $sequence_8 = { 89c8 0fb63c0b 99 f77c241c 89f8 } // n = 5, score = 300 // 89c8 | mov eax, ecx // 0fb63c0b | movzx edi, byte ptr [ebx + ecx] // 99 | cdq // f77c241c | idiv dword ptr [esp + 0x1c] // 89f8 | mov eax, edi $sequence_9 = { 89f8 02441500 01c6 89f0 0fb6c0 } // n = 5, score = 300 // 89f8 | mov eax, edi // 02441500 | add al, byte ptr [ebp + edx] // 01c6 | add esi, eax // 89f0 | mov eax, esi // 0fb6c0 | movzx eax, al condition: 7 of them and filesize < 106496 }
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