Actor(s): Silent Chollima
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rule win_andardoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.andardoor." 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.andardoor" 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 = { 4c8d8c2400020000 33d2 0f1f8000000000 410fb60c11 880c10 488d5201 84c9 } // n = 7, score = 200 // 4c8d8c2400020000 | mov dword ptr [esp + 0x10], esi // 33d2 | dec eax // 0f1f8000000000 | mov dword ptr [esp + 0x18], edi // 410fb60c11 | push ebp // 880c10 | dec eax // 488d5201 | lea ebp, [esp - 0x17c0] // 84c9 | mov eax, 0x18c0 $sequence_1 = { 6690 488bcb ff15???????? a810 741f 40383d???????? 0f84d0000000 } // n = 7, score = 200 // 6690 | xor eax, esp // 488bcb | dec eax // ff15???????? | // a810 | mov dword ptr [ebp + 0x250], eax // 741f | movsd qword ptr [esp + 0x50], xmm2 // 40383d???????? | // 0f84d0000000 | dec eax $sequence_2 = { 48895c2458 ff15???????? 85c0 752b 488b0d???????? 4885c9 7406 } // n = 7, score = 200 // 48895c2458 | lea ebx, [0x1595b] // ff15???????? | // 85c0 | dec eax // 752b | test eax, eax // 488b0d???????? | // 4885c9 | je 0x1912 // 7406 | dec eax $sequence_3 = { 4881ecf0030000 0f2970d8 0f2978c8 488b05???????? } // n = 4, score = 200 // 4881ecf0030000 | cmp byte ptr [eax], dh // 0f2970d8 | jne 0x282 // 0f2978c8 | dec eax // 488b05???????? | $sequence_4 = { 0f2970d8 0f2978c8 488b05???????? 4833c4 488985c0020000 } // n = 5, score = 200 // 0f2970d8 | lea edx, [eax + 0x208] // 0f2978c8 | dec eax // 488b05???????? | // 4833c4 | mov dword ptr [esp + 0x30], ecx // 488985c0020000 | dec ebp $sequence_5 = { 41b880000000 e8???????? 4533c9 4c8d442430 } // n = 4, score = 200 // 41b880000000 | mov eax, ebx // e8???????? | // 4533c9 | dec eax // 4c8d442430 | lea edx, [ebp - 0x38] $sequence_6 = { b943150000 6689742468 ff15???????? 668944246a 41b810000000 } // n = 5, score = 200 // b943150000 | mov ecx, esi // 6689742468 | dec eax // ff15???????? | // 668944246a | lea ecx, [esi + 1] // 41b810000000 | dec eax $sequence_7 = { 488bf8 4885c0 0f84ed000000 b943150000 6689742468 ff15???????? } // n = 6, score = 200 // 488bf8 | mulsd xmm2, xmm7 // 4885c0 | mulsd xmm2, xmm7 // 0f84ed000000 | xorps xmm2, xmm2 // b943150000 | dec eax // 6689742468 | lea edx, [0x1c074] // ff15???????? | $sequence_8 = { 488bf9 33d2 33c9 498bf0 ff15???????? 85c0 7407 } // n = 7, score = 200 // 488bf9 | lea eax, [0x1a4ed] // 33d2 | dec eax // 33c9 | mov ecx, dword ptr [ebp - 0x51] // 498bf0 | xor eax, eax // ff15???????? | // 85c0 | dec ecx // 7407 | mov ebp, eax $sequence_9 = { 488bcf ff15???????? 488bf8 488d4ffe } // n = 4, score = 200 // 488bcf | dec eax // ff15???????? | // 488bf8 | test eax, eax // 488d4ffe | je 0x4a6 condition: 7 of them and filesize < 339968 }
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