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rule win_helauto_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { e9???????? b902010000 33c0 8dbd9de5ffff c6859ce5ffff30 f3ab } // n = 6, score = 100 // e9???????? | // b902010000 | mov ecx, 0x102 // 33c0 | xor eax, eax // 8dbd9de5ffff | lea edi, [ebp - 0x1a63] // c6859ce5ffff30 | mov byte ptr [ebp - 0x1a64], 0x30 // f3ab | rep stosd dword ptr es:[edi], eax $sequence_1 = { 50 ff75fc e8???????? e9???????? 56 } // n = 5, score = 100 // 50 | push eax // ff75fc | push dword ptr [ebp - 4] // e8???????? | // e9???????? | // 56 | push esi $sequence_2 = { 84c0 0f8472040000 8b3d???????? 6a04 8d85a8f3ffff 68???????? } // n = 6, score = 100 // 84c0 | test al, al // 0f8472040000 | je 0x478 // 8b3d???????? | // 6a04 | push 4 // 8d85a8f3ffff | lea eax, [ebp - 0xc58] // 68???????? | $sequence_3 = { 6830750000 eb48 ff75fc 8b35???????? ffd6 } // n = 5, score = 100 // 6830750000 | push 0x7530 // eb48 | jmp 0x4a // ff75fc | push dword ptr [ebp - 4] // 8b35???????? | // ffd6 | call esi $sequence_4 = { 85c0 0f8443050000 8b45f0 3b45cc 752c 8d85a8f9ffff } // n = 6, score = 100 // 85c0 | test eax, eax // 0f8443050000 | je 0x549 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 3b45cc | cmp eax, dword ptr [ebp - 0x34] // 752c | jne 0x2e // 8d85a8f9ffff | lea eax, [ebp - 0x658] $sequence_5 = { ff15???????? 59 40 59 8945f8 } // n = 5, score = 100 // ff15???????? | // 59 | pop ecx // 40 | inc eax // 59 | pop ecx // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_6 = { e9???????? 6a06 8d4df0 58 } // n = 4, score = 100 // e9???????? | // 6a06 | push 6 // 8d4df0 | lea ecx, [ebp - 0x10] // 58 | pop eax $sequence_7 = { 83c40c 85c0 0f8593000000 50 } // n = 4, score = 100 // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 0f8593000000 | jne 0x99 // 50 | push eax $sequence_8 = { ff15???????? 53 8d85a8f8ffff 68???????? 50 e8???????? } // n = 6, score = 100 // ff15???????? | // 53 | push ebx // 8d85a8f8ffff | lea eax, [ebp - 0x758] // 68???????? | // 50 | push eax // e8???????? | $sequence_9 = { 8bec 53 8b5d0c ff7518 68ff030000 53 ff7508 } // n = 7, score = 100 // 8bec | mov ebp, esp // 53 | push ebx // 8b5d0c | mov ebx, dword ptr [ebp + 0xc] // ff7518 | push dword ptr [ebp + 0x18] // 68ff030000 | push 0x3ff // 53 | push ebx // ff7508 | push dword ptr [ebp + 8] condition: 7 of them and filesize < 57344 }
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