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rule win_makloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 894df8 c745fc00000000 eb09 8b45fc 83c001 8945fc 837dfc42 } // n = 7, score = 200 // 894df8 | mov dword ptr [ebp - 8], ecx // c745fc00000000 | mov dword ptr [ebp - 4], 0 // eb09 | jmp 0xb // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 // 8945fc | mov dword ptr [ebp - 4], eax // 837dfc42 | cmp dword ptr [ebp - 4], 0x42 $sequence_1 = { eb09 8b45fc 83c001 8945fc 837dfc02 7332 8b4dfc } // n = 7, score = 200 // eb09 | jmp 0xb // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 // 8945fc | mov dword ptr [ebp - 4], eax // 837dfc02 | cmp dword ptr [ebp - 4], 2 // 7332 | jae 0x34 // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_2 = { 6bc215 8b4d08 0fb61401 52 } // n = 4, score = 200 // 6bc215 | imul eax, edx, 0x15 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 0fb61401 | movzx edx, byte ptr [ecx + eax] // 52 | push edx $sequence_3 = { e8???????? 8bca ba08000000 c1e202 898500fdffff } // n = 5, score = 200 // e8???????? | // 8bca | mov ecx, edx // ba08000000 | mov edx, 8 // c1e202 | shl edx, 2 // 898500fdffff | mov dword ptr [ebp - 0x300], eax $sequence_4 = { e8???????? 83c404 ba01000000 6bca03 8b5508 0fbe0c0a 33c1 } // n = 7, score = 200 // e8???????? | // 83c404 | add esp, 4 // ba01000000 | mov edx, 1 // 6bca03 | imul ecx, edx, 3 // 8b5508 | mov edx, dword ptr [ebp + 8] // 0fbe0c0a | movsx ecx, byte ptr [edx + ecx] // 33c1 | xor eax, ecx $sequence_5 = { 8b84d108010000 8b94d10c010000 b118 e8???????? 8b55f8 8b4d08 8844d104 } // n = 7, score = 200 // 8b84d108010000 | mov eax, dword ptr [ecx + edx*8 + 0x108] // 8b94d10c010000 | mov edx, dword ptr [ecx + edx*8 + 0x10c] // b118 | mov cl, 0x18 // e8???????? | // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8844d104 | mov byte ptr [ecx + edx*8 + 4], al $sequence_6 = { 68???????? e8???????? 83c404 83f0ff 50 0fb685ede5ffff } // n = 6, score = 200 // 68???????? | // e8???????? | // 83c404 | add esp, 4 // 83f0ff | xor eax, 0xffffffff // 50 | push eax // 0fb685ede5ffff | movzx eax, byte ptr [ebp - 0x1a13] $sequence_7 = { 03148d885d4200 8b00 894218 8a441f04 884228 8b45fc 47 } // n = 7, score = 200 // 03148d885d4200 | add edx, dword ptr [ecx*4 + 0x425d88] // 8b00 | mov eax, dword ptr [eax] // 894218 | mov dword ptr [edx + 0x18], eax // 8a441f04 | mov al, byte ptr [edi + ebx + 4] // 884228 | mov byte ptr [edx + 0x28], al // 8b45fc | mov eax, dword ptr [ebp - 4] // 47 | inc edi $sequence_8 = { 894604 c7460c000e0000 c7461078d14100 e8???????? 85c0 791c ff15???????? } // n = 7, score = 200 // 894604 | mov dword ptr [esi + 4], eax // c7460c000e0000 | mov dword ptr [esi + 0xc], 0xe00 // c7461078d14100 | mov dword ptr [esi + 0x10], 0x41d178 // e8???????? | // 85c0 | test eax, eax // 791c | jns 0x1e // ff15???????? | $sequence_9 = { 52 e8???????? 83c40c 8b450c 83c003 89450c } // n = 6, score = 200 // 52 | push edx // e8???????? | // 83c40c | add esp, 0xc // 8b450c | mov eax, dword ptr [ebp + 0xc] // 83c003 | add eax, 3 // 89450c | mov dword ptr [ebp + 0xc], eax condition: 7 of them and filesize < 335872 }
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