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rule win_helauto_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.helauto." 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.helauto" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8d85ecfeffff 50 53 53 53 52 } // n = 6, score = 100 // 8d85ecfeffff | lea eax, [ebp - 0x114] // 50 | push eax // 53 | push ebx // 53 | push ebx // 53 | push ebx // 52 | push edx $sequence_1 = { 8d8528feffff c7855cffffff01010000 50 66899d60ffffff ff15???????? 8d8528feffff 68???????? } // n = 7, score = 100 // 8d8528feffff | lea eax, [ebp - 0x1d8] // c7855cffffff01010000 | mov dword ptr [ebp - 0xa4], 0x101 // 50 | push eax // 66899d60ffffff | mov word ptr [ebp - 0xa0], bx // ff15???????? | // 8d8528feffff | lea eax, [ebp - 0x1d8] // 68???????? | $sequence_2 = { 57 50 6a1f ff75fc ffd6 } // n = 5, score = 100 // 57 | push edi // 50 | push eax // 6a1f | push 0x1f // ff75fc | push dword ptr [ebp - 4] // ffd6 | call esi $sequence_3 = { 743c 017d10 8b45f4 3b4510 75ad 395dfc } // n = 6, score = 100 // 743c | je 0x3e // 017d10 | add dword ptr [ebp + 0x10], edi // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 3b4510 | cmp eax, dword ptr [ebp + 0x10] // 75ad | jne 0xffffffaf // 395dfc | cmp dword ptr [ebp - 4], ebx $sequence_4 = { b9???????? 50 ff75fc e8???????? e9???????? } // n = 5, score = 100 // b9???????? | // 50 | push eax // ff75fc | push dword ptr [ebp - 4] // e8???????? | // e9???????? | $sequence_5 = { 59 85db 59 750c 50 ff15???????? } // n = 6, score = 100 // 59 | pop ecx // 85db | test ebx, ebx // 59 | pop ecx // 750c | jne 0xe // 50 | push eax // ff15???????? | $sequence_6 = { ff758c 8b35???????? ffd6 ff7588 } // n = 4, score = 100 // ff758c | push dword ptr [ebp - 0x74] // 8b35???????? | // ffd6 | call esi // ff7588 | push dword ptr [ebp - 0x78] $sequence_7 = { 53 50 e8???????? 56 8d85a8f3ffff 53 50 } // n = 7, score = 100 // 53 | push ebx // 50 | push eax // e8???????? | // 56 | push esi // 8d85a8f3ffff | lea eax, [ebp - 0xc58] // 53 | push ebx // 50 | push eax $sequence_8 = { e8???????? 56 8d85a8ebffff 53 50 } // n = 5, score = 100 // e8???????? | // 56 | push esi // 8d85a8ebffff | lea eax, [ebp - 0x1458] // 53 | push ebx // 50 | push eax $sequence_9 = { ffd6 ff75b0 53 53 } // n = 4, score = 100 // ffd6 | call esi // ff75b0 | push dword ptr [ebp - 0x50] // 53 | push ebx // 53 | push ebx condition: 7 of them and filesize < 57344 }
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