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rule win_rektloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.rektloader." 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.rektloader" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8b45ec 0fb648ff 85c9 750b 8b55ec 83ea01 } // n = 6, score = 100 // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 0fb648ff | movzx ecx, byte ptr [eax - 1] // 85c9 | test ecx, ecx // 750b | jne 0xd // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 83ea01 | sub edx, 1 $sequence_1 = { 52 8b8d74ffffff e8???????? 8d8550ffffff 50 8b4d18 } // n = 6, score = 100 // 52 | push edx // 8b8d74ffffff | mov ecx, dword ptr [ebp - 0x8c] // e8???????? | // 8d8550ffffff | lea eax, [ebp - 0xb0] // 50 | push eax // 8b4d18 | mov ecx, dword ptr [ebp + 0x18] $sequence_2 = { 50 8b4de0 51 8b550c 52 8b4d88 e8???????? } // n = 7, score = 100 // 50 | push eax // 8b4de0 | mov ecx, dword ptr [ebp - 0x20] // 51 | push ecx // 8b550c | mov edx, dword ptr [ebp + 0xc] // 52 | push edx // 8b4d88 | mov ecx, dword ptr [ebp - 0x78] // e8???????? | $sequence_3 = { 8955b0 8b45b0 3b45e4 7c28 7f08 8b4dac 3b4de0 } // n = 7, score = 100 // 8955b0 | mov dword ptr [ebp - 0x50], edx // 8b45b0 | mov eax, dword ptr [ebp - 0x50] // 3b45e4 | cmp eax, dword ptr [ebp - 0x1c] // 7c28 | jl 0x2a // 7f08 | jg 0xa // 8b4dac | mov ecx, dword ptr [ebp - 0x54] // 3b4de0 | cmp ecx, dword ptr [ebp - 0x20] $sequence_4 = { 51 e8???????? 83c404 8ad8 8b4dd4 e8???????? 8818 } // n = 7, score = 100 // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // 8ad8 | mov bl, al // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // e8???????? | // 8818 | mov byte ptr [eax], bl $sequence_5 = { 8b4df4 0fbe11 83fa22 7509 8b45f0 83c001 8945f0 } // n = 7, score = 100 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 0fbe11 | movsx edx, byte ptr [ecx] // 83fa22 | cmp edx, 0x22 // 7509 | jne 0xb // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 83c001 | add eax, 1 // 8945f0 | mov dword ptr [ebp - 0x10], eax $sequence_6 = { ebb6 8b45f8 83c001 8945f8 68ba020000 68???????? 6a02 } // n = 7, score = 100 // ebb6 | jmp 0xffffffb8 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 83c001 | add eax, 1 // 8945f8 | mov dword ptr [ebp - 8], eax // 68ba020000 | push 0x2ba // 68???????? | // 6a02 | push 2 $sequence_7 = { 8955fc 741b 6a00 8d45f0 50 8b4dfc 894df8 } // n = 7, score = 100 // 8955fc | mov dword ptr [ebp - 4], edx // 741b | je 0x1d // 6a00 | push 0 // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 894df8 | mov dword ptr [ebp - 8], ecx $sequence_8 = { c745dc00000000 8b55dc 895590 c745fcffffffff 8b4594 50 8b4d90 } // n = 7, score = 100 // c745dc00000000 | mov dword ptr [ebp - 0x24], 0 // 8b55dc | mov edx, dword ptr [ebp - 0x24] // 895590 | mov dword ptr [ebp - 0x70], edx // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // 8b4594 | mov eax, dword ptr [ebp - 0x6c] // 50 | push eax // 8b4d90 | mov ecx, dword ptr [ebp - 0x70] $sequence_9 = { 0fb6d0 85d2 740a 668b4508 668945ce eb09 } // n = 6, score = 100 // 0fb6d0 | movzx edx, al // 85d2 | test edx, edx // 740a | je 0xc // 668b4508 | mov ax, word ptr [ebp + 8] // 668945ce | mov word ptr [ebp - 0x32], ax // eb09 | jmp 0xb condition: 7 of them and filesize < 3080192 }
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