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rule win_rektloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 83bd68ffffff00 742e 8b9568ffffff 52 8d4d98 e8???????? 0fbe00 } // n = 7, score = 100 // 83bd68ffffff00 | cmp dword ptr [ebp - 0x98], 0 // 742e | je 0x30 // 8b9568ffffff | mov edx, dword ptr [ebp - 0x98] // 52 | push edx // 8d4d98 | lea ecx, [ebp - 0x68] // e8???????? | // 0fbe00 | movsx eax, byte ptr [eax] $sequence_1 = { 8b4d14 0fb73441 8b4d08 e8???????? 0fb7d0 3bf2 } // n = 6, score = 100 // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // 0fb73441 | movzx esi, word ptr [ecx + eax*2] // 8b4d08 | mov ecx, dword ptr [ebp + 8] // e8???????? | // 0fb7d0 | movzx edx, ax // 3bf2 | cmp esi, edx $sequence_2 = { 83c41c 89856cfeffff 8b856cfeffff 8b08 8b5004 894d0c 895510 } // n = 7, score = 100 // 83c41c | add esp, 0x1c // 89856cfeffff | mov dword ptr [ebp - 0x194], eax // 8b856cfeffff | mov eax, dword ptr [ebp - 0x194] // 8b08 | mov ecx, dword ptr [eax] // 8b5004 | mov edx, dword ptr [eax + 4] // 894d0c | mov dword ptr [ebp + 0xc], ecx // 895510 | mov dword ptr [ebp + 0x10], edx $sequence_3 = { 51 8b5508 52 8b45f8 8945fc 8b4dfc ff15???????? } // n = 7, score = 100 // 51 | push ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8945fc | mov dword ptr [ebp - 4], eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // ff15???????? | $sequence_4 = { 8b8514faffff f7d8 83e801 898528faffff 8b8d28faffff 898d10faffff 8b550c } // n = 7, score = 100 // 8b8514faffff | mov eax, dword ptr [ebp - 0x5ec] // f7d8 | neg eax // 83e801 | sub eax, 1 // 898528faffff | mov dword ptr [ebp - 0x5d8], eax // 8b8d28faffff | mov ecx, dword ptr [ebp - 0x5d8] // 898d10faffff | mov dword ptr [ebp - 0x5f0], ecx // 8b550c | mov edx, dword ptr [ebp + 0xc] $sequence_5 = { 8b4520 8b08 83c902 8b5520 890a eb35 8b45f0 } // n = 7, score = 100 // 8b4520 | mov eax, dword ptr [ebp + 0x20] // 8b08 | mov ecx, dword ptr [eax] // 83c902 | or ecx, 2 // 8b5520 | mov edx, dword ptr [ebp + 0x20] // 890a | mov dword ptr [edx], ecx // eb35 | jmp 0x37 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_6 = { c6002d 8b4d90 83c101 894d90 } // n = 4, score = 100 // c6002d | mov byte ptr [eax], 0x2d // 8b4d90 | mov ecx, dword ptr [ebp - 0x70] // 83c101 | add ecx, 1 // 894d90 | mov dword ptr [ebp - 0x70], ecx $sequence_7 = { 50 8d4dd4 e8???????? 8945b0 8b4db0 0fbe11 0355cc } // n = 7, score = 100 // 50 | push eax // 8d4dd4 | lea ecx, [ebp - 0x2c] // e8???????? | // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8b4db0 | mov ecx, dword ptr [ebp - 0x50] // 0fbe11 | movsx edx, byte ptr [ecx] // 0355cc | add edx, dword ptr [ebp - 0x34] $sequence_8 = { b8ffff0000 e9???????? 6a01 8d4df8 e8???????? 8845ff 6a04 } // n = 7, score = 100 // b8ffff0000 | mov eax, 0xffff // e9???????? | // 6a01 | push 1 // 8d4df8 | lea ecx, [ebp - 8] // e8???????? | // 8845ff | mov byte ptr [ebp - 1], al // 6a04 | push 4 $sequence_9 = { e8???????? 83c404 33c9 8945e0 894de4 8b5508 } // n = 6, score = 100 // e8???????? | // 83c404 | add esp, 4 // 33c9 | xor ecx, ecx // 8945e0 | mov dword ptr [ebp - 0x20], eax // 894de4 | mov dword ptr [ebp - 0x1c], ecx // 8b5508 | mov edx, dword ptr [ebp + 8] condition: 7 of them and filesize < 3080192 }
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