Actor(s): Energetic Bear
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rule win_heriplor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 91 3b5d0c 7401 40 } // n = 4, score = 300 // 91 | xchg eax, ecx // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 7401 | je 3 // 40 | inc eax $sequence_1 = { ff7508 50 e8???????? 85c0 7404 89d1 ebe8 } // n = 7, score = 300 // ff7508 | push dword ptr [ebp + 8] // 50 | push eax // e8???????? | // 85c0 | test eax, eax // 7404 | je 6 // 89d1 | mov ecx, edx // ebe8 | jmp 0xffffffea $sequence_2 = { 85c0 7404 89d1 ebe8 8b7918 8b5f3c } // n = 6, score = 300 // 85c0 | test eax, eax // 7404 | je 6 // 89d1 | mov ecx, edx // ebe8 | jmp 0xffffffea // 8b7918 | mov edi, dword ptr [ecx + 0x18] // 8b5f3c | mov ebx, dword ptr [edi + 0x3c] $sequence_3 = { 6a01 ff750c 56 e8???????? 85c0 7407 } // n = 6, score = 300 // 6a01 | push 1 // ff750c | push dword ptr [ebp + 0xc] // 56 | push esi // e8???????? | // 85c0 | test eax, eax // 7407 | je 9 $sequence_4 = { e8???????? 85c0 7407 83c204 43 } // n = 5, score = 300 // e8???????? | // 85c0 | test eax, eax // 7407 | je 9 // 83c204 | add edx, 4 // 43 | inc ebx $sequence_5 = { 01f8 5f 5e 89ec 5d c20800 } // n = 6, score = 300 // 01f8 | add eax, edi // 5f | pop edi // 5e | pop esi // 89ec | mov esp, ebp // 5d | pop ebp // c20800 | ret 8 $sequence_6 = { ebed 91 3b5d0c 7401 40 5b } // n = 6, score = 300 // ebed | jmp 0xffffffef // 91 | xchg eax, ecx // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 7401 | je 3 // 40 | inc eax // 5b | pop ebx $sequence_7 = { 85ff 7420 46 46 46 46 } // n = 6, score = 300 // 85ff | test edi, edi // 7420 | je 0x22 // 46 | inc esi // 46 | inc esi // 46 | inc esi // 46 | inc esi $sequence_8 = { 56 57 33c9 648b4130 8b400c } // n = 5, score = 300 // 56 | push esi // 57 | push edi // 33c9 | xor ecx, ecx // 648b4130 | mov eax, dword ptr fs:[ecx + 0x30] // 8b400c | mov eax, dword ptr [eax + 0xc] $sequence_9 = { 83c204 43 43 ebe6 33d2 668b13 } // n = 6, score = 300 // 83c204 | add edx, 4 // 43 | inc ebx // 43 | inc ebx // ebe6 | jmp 0xffffffe8 // 33d2 | xor edx, edx // 668b13 | mov dx, word ptr [ebx] condition: 7 of them and filesize < 49152 }
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