There is no description at this point.
rule win_virdetdoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.virdetdoor." 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.virdetdoor" malpedia_rule_date = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 3bf0 7d17 8b8bac020000 2bc6 50 8d0431 50 } // n = 7, score = 100 // 3bf0 | cmp esi, eax // 7d17 | jge 0x19 // 8b8bac020000 | mov ecx, dword ptr [ebx + 0x2ac] // 2bc6 | sub eax, esi // 50 | push eax // 8d0431 | lea eax, [ecx + esi] // 50 | push eax $sequence_1 = { 8d4fc3 83f905 7760 85f6 7437 } // n = 5, score = 100 // 8d4fc3 | lea ecx, [edi - 0x3d] // 83f905 | cmp ecx, 5 // 7760 | ja 0x62 // 85f6 | test esi, esi // 7437 | je 0x39 $sequence_2 = { 7737 8b75fc 83fb03 740a 8a06 46 } // n = 6, score = 100 // 7737 | ja 0x39 // 8b75fc | mov esi, dword ptr [ebp - 4] // 83fb03 | cmp ebx, 3 // 740a | je 0xc // 8a06 | mov al, byte ptr [esi] // 46 | inc esi $sequence_3 = { 83c40c 66c70645cc 33c0 66c7460840ff 40 } // n = 5, score = 100 // 83c40c | add esp, 0xc // 66c70645cc | mov word ptr [esi], 0xcc45 // 33c0 | xor eax, eax // 66c7460840ff | mov word ptr [esi + 8], 0xff40 // 40 | inc eax $sequence_4 = { 7462 0fb7560c 8b442410 c1ea04 83e20f 8d0490 89442418 } // n = 7, score = 100 // 7462 | je 0x64 // 0fb7560c | movzx edx, word ptr [esi + 0xc] // 8b442410 | mov eax, dword ptr [esp + 0x10] // c1ea04 | shr edx, 4 // 83e20f | and edx, 0xf // 8d0490 | lea eax, [eax + edx*4] // 89442418 | mov dword ptr [esp + 0x18], eax $sequence_5 = { 8b7d10 57 7434 8b35???????? ffd6 50 8d45cc } // n = 7, score = 100 // 8b7d10 | mov edi, dword ptr [ebp + 0x10] // 57 | push edi // 7434 | je 0x36 // 8b35???????? | // ffd6 | call esi // 50 | push eax // 8d45cc | lea eax, [ebp - 0x34] $sequence_6 = { c1e808 0bd0 8a4508 884327 816324000000ff } // n = 5, score = 100 // c1e808 | shr eax, 8 // 0bd0 | or edx, eax // 8a4508 | mov al, byte ptr [ebp + 8] // 884327 | mov byte ptr [ebx + 0x27], al // 816324000000ff | and dword ptr [ebx + 0x24], 0xff000000 $sequence_7 = { 50 ffd6 83c418 803f3a } // n = 4, score = 100 // 50 | push eax // ffd6 | call esi // 83c418 | add esp, 0x18 // 803f3a | cmp byte ptr [edi], 0x3a $sequence_8 = { 56 6a28 33c0 5a } // n = 4, score = 100 // 56 | push esi // 6a28 | push 0x28 // 33c0 | xor eax, eax // 5a | pop edx $sequence_9 = { 6a44 5a 8bcb e8???????? 83c410 8bf8 85ff } // n = 7, score = 100 // 6a44 | push 0x44 // 5a | pop edx // 8bcb | mov ecx, ebx // e8???????? | // 83c410 | add esp, 0x10 // 8bf8 | mov edi, eax // 85ff | test edi, edi condition: 7 of them and filesize < 106496 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY