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rule win_fakerean_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.fakerean." 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.fakerean" 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 = { 752e 8945fc eb29 395dfc 7524 57 8bce } // n = 7, score = 300 // 752e | jne 0x30 // 8945fc | mov dword ptr [ebp - 4], eax // eb29 | jmp 0x2b // 395dfc | cmp dword ptr [ebp - 4], ebx // 7524 | jne 0x26 // 57 | push edi // 8bce | mov ecx, esi $sequence_1 = { 49 6a01 ff750c 50 57 ff7514 40 } // n = 7, score = 300 // 49 | dec ecx // 6a01 | push 1 // ff750c | push dword ptr [ebp + 0xc] // 50 | push eax // 57 | push edi // ff7514 | push dword ptr [ebp + 0x14] // 40 | inc eax $sequence_2 = { ff15???????? 3d14050000 74e5 ff7508 56 57 ff15???????? } // n = 7, score = 300 // ff15???????? | // 3d14050000 | cmp eax, 0x514 // 74e5 | je 0xffffffe7 // ff7508 | push dword ptr [ebp + 8] // 56 | push esi // 57 | push edi // ff15???????? | $sequence_3 = { ff7508 ff15???????? 3bc3 0f8495000000 8b400c 8b00 } // n = 6, score = 300 // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 3bc3 | cmp eax, ebx // 0f8495000000 | je 0x9b // 8b400c | mov eax, dword ptr [eax + 0xc] // 8b00 | mov eax, dword ptr [eax] $sequence_4 = { 59 3bc3 7419 8d5010 e8???????? 8945e0 3bc3 } // n = 7, score = 300 // 59 | pop ecx // 3bc3 | cmp eax, ebx // 7419 | je 0x1b // 8d5010 | lea edx, [eax + 0x10] // e8???????? | // 8945e0 | mov dword ptr [ebp - 0x20], eax // 3bc3 | cmp eax, ebx $sequence_5 = { ff35???????? ff15???????? 6800000500 6aec ff35???????? ff15???????? 680000cf06 } // n = 7, score = 300 // ff35???????? | // ff15???????? | // 6800000500 | push 0x50000 // 6aec | push -0x14 // ff35???????? | // ff15???????? | // 680000cf06 | push 0x6cf0000 $sequence_6 = { 741a 81fe00020000 7d12 56 8bc7 e8???????? } // n = 6, score = 300 // 741a | je 0x1c // 81fe00020000 | cmp esi, 0x200 // 7d12 | jge 0x14 // 56 | push esi // 8bc7 | mov eax, edi // e8???????? | $sequence_7 = { 8b4df0 6bc018 6bc918 8b4c190c 2b4c1804 f7df } // n = 6, score = 300 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 6bc018 | imul eax, eax, 0x18 // 6bc918 | imul ecx, ecx, 0x18 // 8b4c190c | mov ecx, dword ptr [ecx + ebx + 0xc] // 2b4c1804 | sub ecx, dword ptr [eax + ebx + 4] // f7df | neg edi $sequence_8 = { f7d8 1bc0 25bfe0ffff 05401f0000 50 ff35???????? ff15???????? } // n = 7, score = 300 // f7d8 | neg eax // 1bc0 | sbb eax, eax // 25bfe0ffff | and eax, 0xffffe0bf // 05401f0000 | add eax, 0x1f40 // 50 | push eax // ff35???????? | // ff15???????? | $sequence_9 = { 8d45f0 50 8d450c 50 ff15???????? 85c0 7431 } // n = 7, score = 300 // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // 8d450c | lea eax, [ebp + 0xc] // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 7431 | je 0x33 condition: 7 of them and filesize < 4071424 }
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