Actor(s): VICEROY TIGER
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rule win_backconfig_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.backconfig." 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.backconfig" 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 = { 57 33ff ffb700264100 ff15???????? 898700264100 83c704 83ff28 } // n = 7, score = 100 // 57 | push edi // 33ff | xor edi, edi // ffb700264100 | push dword ptr [edi + 0x412600] // ff15???????? | // 898700264100 | mov dword ptr [edi + 0x412600], eax // 83c704 | add edi, 4 // 83ff28 | cmp edi, 0x28 $sequence_1 = { 8d75d0 e8???????? 837de410 8b45d0 7302 8bc6 } // n = 6, score = 100 // 8d75d0 | lea esi, [ebp - 0x30] // e8???????? | // 837de410 | cmp dword ptr [ebp - 0x1c], 0x10 // 8b45d0 | mov eax, dword ptr [ebp - 0x30] // 7302 | jae 4 // 8bc6 | mov eax, esi $sequence_2 = { c1f805 8b0485c0504100 83e61f c1e606 8d443004 8020fe ff15???????? } // n = 7, score = 100 // c1f805 | sar eax, 5 // 8b0485c0504100 | mov eax, dword ptr [eax*4 + 0x4150c0] // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 8d443004 | lea eax, [eax + esi + 4] // 8020fe | and byte ptr [eax], 0xfe // ff15???????? | $sequence_3 = { 68???????? 52 e8???????? 83c408 6a00 89850cfdffff 6a00 } // n = 7, score = 100 // 68???????? | // 52 | push edx // e8???????? | // 83c408 | add esp, 8 // 6a00 | push 0 // 89850cfdffff | mov dword ptr [ebp - 0x2f4], eax // 6a00 | push 0 $sequence_4 = { 57 56 e8???????? c1f805 56 8d3c85c0504100 } // n = 6, score = 100 // 57 | push edi // 56 | push esi // e8???????? | // c1f805 | sar eax, 5 // 56 | push esi // 8d3c85c0504100 | lea edi, [eax*4 + 0x4150c0] $sequence_5 = { 68???????? 50 c78504fdffff0031a004 ff15???????? 8bf8 6a05 } // n = 6, score = 100 // 68???????? | // 50 | push eax // c78504fdffff0031a004 | mov dword ptr [ebp - 0x2fc], 0x4a03100 // ff15???????? | // 8bf8 | mov edi, eax // 6a05 | push 5 $sequence_6 = { 8975e0 8db1682a4100 8975e4 eb2b 8a4601 84c0 } // n = 6, score = 100 // 8975e0 | mov dword ptr [ebp - 0x20], esi // 8db1682a4100 | lea esi, [ecx + 0x412a68] // 8975e4 | mov dword ptr [ebp - 0x1c], esi // eb2b | jmp 0x2d // 8a4601 | mov al, byte ptr [esi + 1] // 84c0 | test al, al $sequence_7 = { 85c0 7538 8bff ff15???????? 83f87a } // n = 5, score = 100 // 85c0 | test eax, eax // 7538 | jne 0x3a // 8bff | mov edi, edi // ff15???????? | // 83f87a | cmp eax, 0x7a condition: 7 of them and filesize < 217088 }
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