Actor(s): Energetic Bear
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rule win_heriplor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.heriplor." 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.heriplor" 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 = { c20c00 55 89e5 56 57 33c9 648b4130 } // n = 7, score = 300 // c20c00 | ret 0xc // 55 | push ebp // 89e5 | mov ebp, esp // 56 | push esi // 57 | push edi // 33c9 | xor ecx, ecx // 648b4130 | mov eax, dword ptr fs:[ecx + 0x30] $sequence_1 = { 40 5b 59 89ec } // n = 4, score = 300 // 40 | inc eax // 5b | pop ebx // 59 | pop ecx // 89ec | mov esp, ebp $sequence_2 = { 8a08 84c9 740d 80c960 01cb c1e301 } // n = 6, score = 300 // 8a08 | mov cl, byte ptr [eax] // 84c9 | test cl, cl // 740d | je 0xf // 80c960 | or cl, 0x60 // 01cb | add ebx, ecx // c1e301 | shl ebx, 1 $sequence_3 = { 668b13 8b0491 01f8 5f 5e 89ec 5d } // n = 7, score = 300 // 668b13 | mov dx, word ptr [ebx] // 8b0491 | mov eax, dword ptr [ecx + edx*4] // 01f8 | add eax, edi // 5f | pop edi // 5e | pop esi // 89ec | mov esp, ebp // 5d | pop ebp $sequence_4 = { 89e5 51 53 33db 33c9 8b4508 } // n = 6, score = 300 // 89e5 | mov ebp, esp // 51 | push ecx // 53 | push ebx // 33db | xor ebx, ebx // 33c9 | xor ecx, ecx // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_5 = { 85ff 7420 46 46 } // n = 4, score = 300 // 85ff | test edi, edi // 7420 | je 0x22 // 46 | inc esi // 46 | inc esi $sequence_6 = { 7407 83c204 43 43 ebe6 33d2 668b13 } // n = 7, score = 300 // 7407 | je 9 // 83c204 | add edx, 4 // 43 | inc ebx // 43 | inc ebx // ebe6 | jmp 0xffffffe8 // 33d2 | xor edx, edx // 668b13 | mov dx, word ptr [ebx] $sequence_7 = { 01fb 8b32 01fe 6a01 ff750c } // n = 5, score = 300 // 01fb | add ebx, edi // 8b32 | mov esi, dword ptr [edx] // 01fe | add esi, edi // 6a01 | push 1 // ff750c | push dword ptr [ebp + 0xc] $sequence_8 = { 3b5d0c 7401 40 5b } // n = 4, score = 300 // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 7401 | je 3 // 40 | inc eax // 5b | pop ebx $sequence_9 = { 01f9 01fa 01fb 8b32 01fe 6a01 ff750c } // n = 7, score = 300 // 01f9 | add ecx, edi // 01fa | add edx, edi // 01fb | add ebx, edi // 8b32 | mov esi, dword ptr [edx] // 01fe | add esi, edi // 6a01 | push 1 // ff750c | push dword ptr [ebp + 0xc] condition: 7 of them and filesize < 49152 }
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