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rule win_concealment_troy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { e8???????? 56 8d4c2430 68???????? } // n = 4, score = 100 // e8???????? | // 56 | push esi // 8d4c2430 | lea ecx, [esp + 0x30] // 68???????? | $sequence_1 = { 56 57 b900000000 8b7508 0fb68600010000 0fb69e01010000 33d2 } // n = 7, score = 100 // 56 | push esi // 57 | push edi // b900000000 | mov ecx, 0 // 8b7508 | mov esi, dword ptr [ebp + 8] // 0fb68600010000 | movzx eax, byte ptr [esi + 0x100] // 0fb69e01010000 | movzx ebx, byte ptr [esi + 0x101] // 33d2 | xor edx, edx $sequence_2 = { e8???????? 8d542420 8a08 880a 40 42 } // n = 6, score = 100 // e8???????? | // 8d542420 | lea edx, [esp + 0x20] // 8a08 | mov cl, byte ptr [eax] // 880a | mov byte ptr [edx], cl // 40 | inc eax // 42 | inc edx $sequence_3 = { 50 e8???????? 83c418 8d942458010000 e8???????? 8d542420 8a08 } // n = 7, score = 100 // 50 | push eax // e8???????? | // 83c418 | add esp, 0x18 // 8d942458010000 | lea edx, [esp + 0x158] // e8???????? | // 8d542420 | lea edx, [esp + 0x20] // 8a08 | mov cl, byte ptr [eax] $sequence_4 = { 59 85c0 7456 8b4de0 8d0c8da0774100 8901 8305????????20 } // n = 7, score = 100 // 59 | pop ecx // 85c0 | test eax, eax // 7456 | je 0x58 // 8b4de0 | mov ecx, dword ptr [ebp - 0x20] // 8d0c8da0774100 | lea ecx, [ecx*4 + 0x4177a0] // 8901 | mov dword ptr [ecx], eax // 8305????????20 | $sequence_5 = { 7525 57 ff15???????? 53 ff15???????? 33c0 } // n = 6, score = 100 // 7525 | jne 0x27 // 57 | push edi // ff15???????? | // 53 | push ebx // ff15???????? | // 33c0 | xor eax, eax $sequence_6 = { 53 52 885c2424 e8???????? 83c40c 6803010000 } // n = 6, score = 100 // 53 | push ebx // 52 | push edx // 885c2424 | mov byte ptr [esp + 0x24], bl // e8???????? | // 83c40c | add esp, 0xc // 6803010000 | push 0x103 $sequence_7 = { ff34c518554100 ff15???????? 5d c3 } // n = 4, score = 100 // ff34c518554100 | push dword ptr [eax*8 + 0x415518] // ff15???????? | // 5d | pop ebp // c3 | ret $sequence_8 = { 8d4c2428 33c0 33f6 8d7901 8d642400 8a11 } // n = 6, score = 100 // 8d4c2428 | lea ecx, [esp + 0x28] // 33c0 | xor eax, eax // 33f6 | xor esi, esi // 8d7901 | lea edi, [ecx + 1] // 8d642400 | lea esp, [esp] // 8a11 | mov dl, byte ptr [ecx] $sequence_9 = { e8???????? 8be5 5d c3 8b4c2414 83c107 68???????? } // n = 7, score = 100 // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 83c107 | add ecx, 7 // 68???????? | condition: 7 of them and filesize < 229376 }
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