Actor(s): APT37
There is no description at this point.
rule win_goldbackdoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.goldbackdoor." 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.goldbackdoor" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { ff15???????? 6a20 89730c e8???????? 83c404 8945f0 8bc8 } // n = 7, score = 100 // ff15???????? | // 6a20 | push 0x20 // 89730c | mov dword ptr [ebx + 0xc], esi // e8???????? | // 83c404 | add esp, 4 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8bc8 | mov ecx, eax $sequence_1 = { ff7608 ff15???????? 8b45ec 6aff ff7008 ff15???????? 8b45ec } // n = 7, score = 100 // ff7608 | push dword ptr [esi + 8] // ff15???????? | // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 6aff | push -1 // ff7008 | push dword ptr [eax + 8] // ff15???????? | // 8b45ec | mov eax, dword ptr [ebp - 0x14] $sequence_2 = { 6812010000 68???????? 6a6b 6a79 6a0a e8???????? } // n = 6, score = 100 // 6812010000 | push 0x112 // 68???????? | // 6a6b | push 0x6b // 6a79 | push 0x79 // 6a0a | push 0xa // e8???????? | $sequence_3 = { ff15???????? 8d5508 8d4de0 e8???????? b9???????? 8bf0 e8???????? } // n = 7, score = 100 // ff15???????? | // 8d5508 | lea edx, [ebp + 8] // 8d4de0 | lea ecx, [ebp - 0x20] // e8???????? | // b9???????? | // 8bf0 | mov esi, eax // e8???????? | $sequence_4 = { ff7614 e8???????? 83c404 83f840 7e07 68b1000000 ebbc } // n = 7, score = 100 // ff7614 | push dword ptr [esi + 0x14] // e8???????? | // 83c404 | add esp, 4 // 83f840 | cmp eax, 0x40 // 7e07 | jle 9 // 68b1000000 | push 0xb1 // ebbc | jmp 0xffffffbe $sequence_5 = { ff7504 46 e8???????? 83c404 3bf0 7c9b 8b5c2418 } // n = 7, score = 100 // ff7504 | push dword ptr [ebp + 4] // 46 | inc esi // e8???????? | // 83c404 | add esp, 4 // 3bf0 | cmp esi, eax // 7c9b | jl 0xffffff9d // 8b5c2418 | mov ebx, dword ptr [esp + 0x18] $sequence_6 = { ff761c e8???????? 83c408 85c0 74d4 e8???????? 50 } // n = 7, score = 100 // ff761c | push dword ptr [esi + 0x1c] // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax // 74d4 | je 0xffffffd6 // e8???????? | // 50 | push eax $sequence_7 = { ff742430 56 e8???????? 83c418 85c0 7417 8d442408 } // n = 7, score = 100 // ff742430 | push dword ptr [esp + 0x30] // 56 | push esi // e8???????? | // 83c418 | add esp, 0x18 // 85c0 | test eax, eax // 7417 | je 0x19 // 8d442408 | lea eax, [esp + 8] $sequence_8 = { 0f8907ffffff 56 57 53 ff74244c e8???????? 33c9 } // n = 7, score = 100 // 0f8907ffffff | jns 0xffffff0d // 56 | push esi // 57 | push edi // 53 | push ebx // ff74244c | push dword ptr [esp + 0x4c] // e8???????? | // 33c9 | xor ecx, ecx $sequence_9 = { 83f810 0f82e3020000 40 8d8d60ffffff 50 ffb560ffffff e9???????? } // n = 7, score = 100 // 83f810 | cmp eax, 0x10 // 0f82e3020000 | jb 0x2e9 // 40 | inc eax // 8d8d60ffffff | lea ecx, [ebp - 0xa0] // 50 | push eax // ffb560ffffff | push dword ptr [ebp - 0xa0] // e9???????? | condition: 7 of them and filesize < 2455552 }
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