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rule win_bruh_wiper_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.bruh_wiper." 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.bruh_wiper" 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 = { e8???????? 83c40c be01080000 0f1f8000000000 } // n = 4, score = 100 // e8???????? | // 83c40c | add esp, 0xc // be01080000 | mov esi, 0x801 // 0f1f8000000000 | nop dword ptr [eax] $sequence_1 = { 83ee01 75e3 8b4dfc 5f 5e } // n = 5, score = 100 // 83ee01 | sub esi, 1 // 75e3 | jne 0xffffffe5 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 5f | pop edi // 5e | pop esi $sequence_2 = { 8d45f4 57 50 ff15???????? ff15???????? } // n = 5, score = 100 // 8d45f4 | lea eax, [ebp - 0xc] // 57 | push edi // 50 | push eax // ff15???????? | // ff15???????? | $sequence_3 = { 68b40200c0 ffd6 8b4dfc 5f 33cd 5e } // n = 6, score = 100 // 68b40200c0 | push 0xc00002b4 // ffd6 | call esi // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 5f | pop edi // 33cd | xor ecx, ebp // 5e | pop esi $sequence_4 = { 6a00 8d85f8fdffff 50 6800020000 8d85fcfdffff 50 } // n = 6, score = 100 // 6a00 | push 0 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax // 6800020000 | push 0x200 // 8d85fcfdffff | lea eax, [ebp - 0x204] // 50 | push eax $sequence_5 = { 68???????? 57 ffd3 6800020000 8d85fcfdffff 6a00 } // n = 6, score = 100 // 68???????? | // 57 | push edi // ffd3 | call ebx // 6800020000 | push 0x200 // 8d85fcfdffff | lea eax, [ebp - 0x204] // 6a00 | push 0 $sequence_6 = { 50 ffd6 8bf0 8d45fb 50 6a00 6a01 } // n = 7, score = 100 // 50 | push eax // ffd6 | call esi // 8bf0 | mov esi, eax // 8d45fb | lea eax, [ebp - 5] // 50 | push eax // 6a00 | push 0 // 6a01 | push 1 $sequence_7 = { 6800200000 68???????? 57 ffd3 6800020000 8d85fcfdffff } // n = 6, score = 100 // 6800200000 | push 0x2000 // 68???????? | // 57 | push edi // ffd3 | call ebx // 6800020000 | push 0x200 // 8d85fcfdffff | lea eax, [ebp - 0x204] $sequence_8 = { e8???????? 83c40c be01080000 0f1f8000000000 6a00 } // n = 5, score = 100 // e8???????? | // 83c40c | add esp, 0xc // be01080000 | mov esi, 0x801 // 0f1f8000000000 | nop dword ptr [eax] // 6a00 | push 0 $sequence_9 = { 50 ffd6 68???????? 68???????? 8bf8 } // n = 5, score = 100 // 50 | push eax // ffd6 | call esi // 68???????? | // 68???????? | // 8bf8 | mov edi, eax condition: 7 of them and filesize < 65536 }
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