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rule win_fakerean_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 83c40c 6a07 05???????? 59 ba30f8ffff } // n = 5, score = 300 // 83c40c | add esp, 0xc // 6a07 | push 7 // 05???????? | // 59 | pop ecx // ba30f8ffff | mov edx, 0xfffff830 $sequence_1 = { ab ab ab ab 6a08 59 } // n = 6, score = 300 // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // 6a08 | push 8 // 59 | pop ecx $sequence_2 = { ff37 ff15???????? ff45fc 837dfc04 7cb7 53 ff15???????? } // n = 7, score = 300 // ff37 | push dword ptr [edi] // ff15???????? | // ff45fc | inc dword ptr [ebp - 4] // 837dfc04 | cmp dword ptr [ebp - 4], 4 // 7cb7 | jl 0xffffffb9 // 53 | push ebx // ff15???????? | $sequence_3 = { 8d45e4 50 6a00 56 ff15???????? } // n = 5, score = 300 // 8d45e4 | lea eax, [ebp - 0x1c] // 50 | push eax // 6a00 | push 0 // 56 | push esi // ff15???????? | $sequence_4 = { 742c 8b11 33db 83f81b 0f95c3 8d5c1b02 53 } // n = 7, score = 300 // 742c | je 0x2e // 8b11 | mov edx, dword ptr [ecx] // 33db | xor ebx, ebx // 83f81b | cmp eax, 0x1b // 0f95c3 | setne bl // 8d5c1b02 | lea ebx, [ebx + ebx + 2] // 53 | push ebx $sequence_5 = { 52 50 53 51 e8???????? 3bd7 } // n = 6, score = 300 // 52 | push edx // 50 | push eax // 53 | push ebx // 51 | push ecx // e8???????? | // 3bd7 | cmp edx, edi $sequence_6 = { 83c11a ffb48ef0000000 50 ff15???????? 33c0 399e88040000 } // n = 6, score = 300 // 83c11a | add ecx, 0x1a // ffb48ef0000000 | push dword ptr [esi + ecx*4 + 0xf0] // 50 | push eax // ff15???????? | // 33c0 | xor eax, eax // 399e88040000 | cmp dword ptr [esi + 0x488], ebx $sequence_7 = { 83c40c 83f801 7419 57 6a3c 68???????? e8???????? } // n = 7, score = 300 // 83c40c | add esp, 0xc // 83f801 | cmp eax, 1 // 7419 | je 0x1b // 57 | push edi // 6a3c | push 0x3c // 68???????? | // e8???????? | $sequence_8 = { c9 c21c00 55 8bec 53 56 8b7510 } // n = 7, score = 300 // c9 | leave // c21c00 | ret 0x1c // 55 | push ebp // 8bec | mov ebp, esp // 53 | push ebx // 56 | push esi // 8b7510 | mov esi, dword ptr [ebp + 0x10] $sequence_9 = { ff33 ff15???????? 56 ff33 ff15???????? 897df8 8b45f0 } // n = 7, score = 300 // ff33 | push dword ptr [ebx] // ff15???????? | // 56 | push esi // ff33 | push dword ptr [ebx] // ff15???????? | // 897df8 | mov dword ptr [ebp - 8], edi // 8b45f0 | mov eax, dword ptr [ebp - 0x10] condition: 7 of them and filesize < 4071424 }
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