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rule win_concealment_troy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 6a00 6a04 6a00 6aff ff15???????? e8???????? 50 } // n = 7, score = 100 // 6a00 | push 0 // 6a04 | push 4 // 6a00 | push 0 // 6aff | push -1 // ff15???????? | // e8???????? | // 50 | push eax $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 = { 894d80 c7458410000000 33c0 88440590 40 3d00010000 } // n = 6, score = 100 // 894d80 | mov dword ptr [ebp - 0x80], ecx // c7458410000000 | mov dword ptr [ebp - 0x7c], 0x10 // 33c0 | xor eax, eax // 88440590 | mov byte ptr [ebp + eax - 0x70], al // 40 | inc eax // 3d00010000 | cmp eax, 0x100 $sequence_3 = { 50 8d8c2438050000 51 e8???????? 8d942434030000 } // n = 5, score = 100 // 50 | push eax // 8d8c2438050000 | lea ecx, [esp + 0x538] // 51 | push ecx // e8???????? | // 8d942434030000 | lea edx, [esp + 0x334] $sequence_4 = { 75f6 80bc242001000022 0f854e040000 6808020000 8d942434090000 } // n = 5, score = 100 // 75f6 | jne 0xfffffff8 // 80bc242001000022 | cmp byte ptr [esp + 0x120], 0x22 // 0f854e040000 | jne 0x454 // 6808020000 | push 0x208 // 8d942434090000 | lea edx, [esp + 0x934] $sequence_5 = { 51 e8???????? 8bf0 83c408 85f6 7523 } // n = 6, score = 100 // 51 | push ecx // e8???????? | // 8bf0 | mov esi, eax // 83c408 | add esp, 8 // 85f6 | test esi, esi // 7523 | jne 0x25 $sequence_6 = { e8???????? 8d8c243c030000 68???????? 51 e8???????? } // n = 5, score = 100 // e8???????? | // 8d8c243c030000 | lea ecx, [esp + 0x33c] // 68???????? | // 51 | push ecx // e8???????? | $sequence_7 = { 50 ffd5 bb???????? 8bf8 e8???????? 8b35???????? 50 } // n = 7, score = 100 // 50 | push eax // ffd5 | call ebp // bb???????? | // 8bf8 | mov edi, eax // e8???????? | // 8b35???????? | // 50 | push eax $sequence_8 = { 55 8bec 83e4f8 b834130000 e8???????? a1???????? 33c4 } // n = 7, score = 100 // 55 | push ebp // 8bec | mov ebp, esp // 83e4f8 | and esp, 0xfffffff8 // b834130000 | mov eax, 0x1334 // e8???????? | // a1???????? | // 33c4 | xor eax, esp $sequence_9 = { 8b1495a0774100 c1e006 8d440224 802080 884dfd 8065fd48 884dff } // n = 7, score = 100 // 8b1495a0774100 | mov edx, dword ptr [edx*4 + 0x4177a0] // c1e006 | shl eax, 6 // 8d440224 | lea eax, [edx + eax + 0x24] // 802080 | and byte ptr [eax], 0x80 // 884dfd | mov byte ptr [ebp - 3], cl // 8065fd48 | and byte ptr [ebp - 3], 0x48 // 884dff | mov byte ptr [ebp - 1], cl condition: 7 of them and filesize < 229376 }
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