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rule win_client_maximus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 85c0 7535 c70424???????? ff15???????? 83ec04 85c0 } // n = 6, score = 300 // 85c0 | test eax, eax // 7535 | jne 0x37 // c70424???????? | // ff15???????? | // 83ec04 | sub esp, 4 // 85c0 | test eax, eax $sequence_1 = { e9???????? c704247e000000 ff15???????? 83ec04 e9???????? } // n = 5, score = 300 // e9???????? | // c704247e000000 | mov dword ptr [esp], 0x7e // ff15???????? | // 83ec04 | sub esp, 4 // e9???????? | $sequence_2 = { 5e 5f 5d c3 8b4210 85c0 } // n = 6, score = 300 // 5e | pop esi // 5f | pop edi // 5d | pop ebp // c3 | ret // 8b4210 | mov eax, dword ptr [edx + 0x10] // 85c0 | test eax, eax $sequence_3 = { 8b5330 c744240800800000 c744240400000000 890424 8954240c ff5320 ff15???????? } // n = 7, score = 300 // 8b5330 | mov edx, dword ptr [ebx + 0x30] // c744240800800000 | mov dword ptr [esp + 8], 0x8000 // c744240400000000 | mov dword ptr [esp + 4], 0 // 890424 | mov dword ptr [esp], eax // 8954240c | mov dword ptr [esp + 0xc], edx // ff5320 | call dword ptr [ebx + 0x20] // ff15???????? | $sequence_4 = { c744240800800000 c744240400000000 890424 8954240c } // n = 4, score = 300 // c744240800800000 | mov dword ptr [esp + 8], 0x8000 // c744240400000000 | mov dword ptr [esp + 4], 0 // 890424 | mov dword ptr [esp], eax // 8954240c | mov dword ptr [esp + 0xc], edx $sequence_5 = { 8b542408 8b442404 85d2 8b4004 7403 0302 } // n = 6, score = 300 // 8b542408 | mov edx, dword ptr [esp + 8] // 8b442404 | mov eax, dword ptr [esp + 4] // 85d2 | test edx, edx // 8b4004 | mov eax, dword ptr [eax + 4] // 7403 | je 5 // 0302 | add eax, dword ptr [edx] $sequence_6 = { 837c242401 7515 8b442420 c70424???????? a3???????? e8???????? b801000000 } // n = 7, score = 300 // 837c242401 | cmp dword ptr [esp + 0x24], 1 // 7515 | jne 0x17 // 8b442420 | mov eax, dword ptr [esp + 0x20] // c70424???????? | // a3???????? | // e8???????? | // b801000000 | mov eax, 1 $sequence_7 = { 85c0 7418 8b5014 85d2 7511 8b5034 85d2 } // n = 7, score = 300 // 85c0 | test eax, eax // 7418 | je 0x1a // 8b5014 | mov edx, dword ptr [eax + 0x14] // 85d2 | test edx, edx // 7511 | jne 0x13 // 8b5034 | mov edx, dword ptr [eax + 0x34] // 85d2 | test edx, edx $sequence_8 = { 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_9 = { 8b5330 890424 89542404 ff532c } // n = 4, score = 300 // 8b5330 | mov edx, dword ptr [ebx + 0x30] // 890424 | mov dword ptr [esp], eax // 89542404 | mov dword ptr [esp + 4], edx // ff532c | call dword ptr [ebx + 0x2c] condition: 7 of them and filesize < 106496 }
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