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rule win_concealment_troy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.concealment_troy." 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.concealment_troy" 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 = { c1f905 8d1c8da0774100 8bf8 83e71f c1e706 8b0b } // n = 6, score = 100 // c1f905 | sar ecx, 5 // 8d1c8da0774100 | lea ebx, [ecx*4 + 0x4177a0] // 8bf8 | mov edi, eax // 83e71f | and edi, 0x1f // c1e706 | shl edi, 6 // 8b0b | mov ecx, dword ptr [ebx] $sequence_1 = { 8bc2 0aff 74df 8b8d90000000 } // n = 4, score = 100 // 8bc2 | mov eax, edx // 0aff | or bh, bh // 74df | je 0xffffffe1 // 8b8d90000000 | mov ecx, dword ptr [ebp + 0x90] $sequence_2 = { 83c40c c744240800000000 85f6 743b 8b16 } // n = 5, score = 100 // 83c40c | add esp, 0xc // c744240800000000 | mov dword ptr [esp + 8], 0 // 85f6 | test esi, esi // 743b | je 0x3d // 8b16 | mov edx, dword ptr [esi] $sequence_3 = { 33c4 89842420010000 8b842428010000 56 57 8944240c 33c0 } // n = 7, score = 100 // 33c4 | xor eax, esp // 89842420010000 | mov dword ptr [esp + 0x120], eax // 8b842428010000 | mov eax, dword ptr [esp + 0x128] // 56 | push esi // 57 | push edi // 8944240c | mov dword ptr [esp + 0xc], eax // 33c0 | xor eax, eax $sequence_4 = { 837ddc00 75e6 c6460401 830eff 2b34bda0774100 c1fe06 } // n = 6, score = 100 // 837ddc00 | cmp dword ptr [ebp - 0x24], 0 // 75e6 | jne 0xffffffe8 // c6460401 | mov byte ptr [esi + 4], 1 // 830eff | or dword ptr [esi], 0xffffffff // 2b34bda0774100 | sub esi, dword ptr [edi*4 + 0x4177a0] // c1fe06 | sar esi, 6 $sequence_5 = { 33db 83c408 3bf3 751a } // n = 4, score = 100 // 33db | xor ebx, ebx // 83c408 | add esp, 8 // 3bf3 | cmp esi, ebx // 751a | jne 0x1c $sequence_6 = { 51 ff15???????? 0fb745d8 99 b964000000 f7f9 0fb745de } // n = 7, score = 100 // 51 | push ecx // ff15???????? | // 0fb745d8 | movzx eax, word ptr [ebp - 0x28] // 99 | cdq // b964000000 | mov ecx, 0x64 // f7f9 | idiv ecx // 0fb745de | movzx eax, word ptr [ebp - 0x22] $sequence_7 = { 8d842420010000 e8???????? 8d542418 8d9b00000000 8a08 880a } // n = 6, score = 100 // 8d842420010000 | lea eax, [esp + 0x120] // e8???????? | // 8d542418 | lea edx, [esp + 0x18] // 8d9b00000000 | lea ebx, [ebx] // 8a08 | mov cl, byte ptr [eax] // 880a | mov byte ptr [edx], cl $sequence_8 = { 8d44242c 57 50 e8???????? 57 8d8c243c010000 } // n = 6, score = 100 // 8d44242c | lea eax, [esp + 0x2c] // 57 | push edi // 50 | push eax // e8???????? | // 57 | push edi // 8d8c243c010000 | lea ecx, [esp + 0x13c] $sequence_9 = { 8d942468020000 83c40c 8bc6 2bd6 } // n = 4, score = 100 // 8d942468020000 | lea edx, [esp + 0x268] // 83c40c | add esp, 0xc // 8bc6 | mov eax, esi // 2bd6 | sub edx, esi condition: 7 of them and filesize < 229376 }
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