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rule win_makloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.makloader." 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.makloader" 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 = { 8bf0 8bfa 8b8538fdffff 8b8d34fdffff 0fb644c106 99 } // n = 6, score = 200 // 8bf0 | mov esi, eax // 8bfa | mov edi, edx // 8b8538fdffff | mov eax, dword ptr [ebp - 0x2c8] // 8b8d34fdffff | mov ecx, dword ptr [ebp - 0x2cc] // 0fb644c106 | movzx eax, byte ptr [ecx + eax*8 + 6] // 99 | cdq $sequence_1 = { c745f800000000 c745f400000000 8b4510 8945d8 8b4d0c } // n = 5, score = 200 // c745f800000000 | mov dword ptr [ebp - 8], 0 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 8945d8 | mov dword ptr [ebp - 0x28], eax // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] $sequence_2 = { 8345f401 807dff00 75ee 8b4df4 2b4dec 894de8 8b55e8 } // n = 7, score = 200 // 8345f401 | add dword ptr [ebp - 0xc], 1 // 807dff00 | cmp byte ptr [ebp - 1], 0 // 75ee | jne 0xfffffff0 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 2b4dec | sub ecx, dword ptr [ebp - 0x14] // 894de8 | mov dword ptr [ebp - 0x18], ecx // 8b55e8 | mov edx, dword ptr [ebp - 0x18] $sequence_3 = { 894de8 8b55e8 8955f0 8b45f8 83f0ff 8945f8 837df000 } // n = 7, score = 200 // 894de8 | mov dword ptr [ebp - 0x18], ecx // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 8955f0 | mov dword ptr [ebp - 0x10], edx // 8b45f8 | mov eax, dword ptr [ebp - 8] // 83f0ff | xor eax, 0xffffffff // 8945f8 | mov dword ptr [ebp - 8], eax // 837df000 | cmp dword ptr [ebp - 0x10], 0 $sequence_4 = { c60100 b8???????? c745dc60de4100 8945bc 8945c0 } // n = 5, score = 200 // c60100 | mov byte ptr [ecx], 0 // b8???????? | // c745dc60de4100 | mov dword ptr [ebp - 0x24], 0x41de60 // 8945bc | mov dword ptr [ebp - 0x44], eax // 8945c0 | mov dword ptr [ebp - 0x40], eax $sequence_5 = { 83c001 894510 ebce 8b4df8 } // n = 4, score = 200 // 83c001 | add eax, 1 // 894510 | mov dword ptr [ebp + 0x10], eax // ebce | jmp 0xffffffd0 // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_6 = { 83c102 8801 8b45fc 8be5 } // n = 4, score = 200 // 83c102 | add ecx, 2 // 8801 | mov byte ptr [ecx], al // 8b45fc | mov eax, dword ptr [ebp - 4] // 8be5 | mov esp, ebp $sequence_7 = { 56 8b4508 50 e8???????? 83c404 8bf0 c1ee08 } // n = 7, score = 200 // 56 | push esi // 8b4508 | mov eax, dword ptr [ebp + 8] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 8bf0 | mov esi, eax // c1ee08 | shr esi, 8 $sequence_8 = { 52 8b4dfc e8???????? 8b4dfc 88413e ba01000000 6bc23e } // n = 7, score = 200 // 52 | push edx // 8b4dfc | mov ecx, dword ptr [ebp - 4] // e8???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 88413e | mov byte ptr [ecx + 0x3e], al // ba01000000 | mov edx, 1 // 6bc23e | imul eax, edx, 0x3e $sequence_9 = { 8b8538fdffff 03b4c5bcfcffff 13bcc5c0fcffff 8b8d38fdffff } // n = 4, score = 200 // 8b8538fdffff | mov eax, dword ptr [ebp - 0x2c8] // 03b4c5bcfcffff | add esi, dword ptr [ebp + eax*8 - 0x344] // 13bcc5c0fcffff | adc edi, dword ptr [ebp + eax*8 - 0x340] // 8b8d38fdffff | mov ecx, dword ptr [ebp - 0x2c8] condition: 7 of them and filesize < 335872 }
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