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rule win_bruh_wiper_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { ff15???????? 8b35???????? 50 ffd6 68???????? 68???????? 8bf8 } // n = 7, score = 100 // ff15???????? | // 8b35???????? | // 50 | push eax // ffd6 | call esi // 68???????? | // 68???????? | // 8bf8 | mov edi, eax $sequence_1 = { 33c5 8945fc 66a1???????? 668945f4 a0???????? 56 } // n = 6, score = 100 // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 66a1???????? | // 668945f4 | mov word ptr [ebp - 0xc], ax // a0???????? | // 56 | push esi $sequence_2 = { 58 6bc000 c7803450a02902000000 6a04 58 } // n = 5, score = 100 // 58 | pop eax // 6bc000 | imul eax, eax, 0 // c7803450a02902000000 | mov dword ptr [eax + 0x29a05034], 2 // 6a04 | push 4 // 58 | pop eax $sequence_3 = { ff15???????? 8b1d???????? 8bf8 6a00 8d85f8fdffff } // n = 5, score = 100 // ff15???????? | // 8b1d???????? | // 8bf8 | mov edi, eax // 6a00 | push 0 // 8d85f8fdffff | lea eax, [ebp - 0x208] $sequence_4 = { 68???????? 68???????? ff15???????? 8b35???????? 50 ffd6 68???????? } // n = 7, score = 100 // 68???????? | // 68???????? | // ff15???????? | // 8b35???????? | // 50 | push eax // ffd6 | call esi // 68???????? | $sequence_5 = { b90b010000 6639881800a029 753e 8b4508 } // n = 4, score = 100 // b90b010000 | mov ecx, 0x10b // 6639881800a029 | cmp word ptr [eax + 0x29a00018], cx // 753e | jne 0x40 // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_6 = { 7503 c1e808 e8???????? e8???????? 68???????? 68???????? ff15???????? } // n = 7, score = 100 // 7503 | jne 5 // c1e808 | shr eax, 8 // e8???????? | // e8???????? | // 68???????? | // 68???????? | // ff15???????? | $sequence_7 = { 8945fc 6800200000 8d85fcdfffff 6a00 } // n = 4, score = 100 // 8945fc | mov dword ptr [ebp - 4], eax // 6800200000 | push 0x2000 // 8d85fcdfffff | lea eax, [ebp - 0x2004] // 6a00 | push 0 $sequence_8 = { 68???????? 57 ffd3 6800020000 8d85fcfdffff 6a00 50 } // n = 7, score = 100 // 68???????? | // 57 | push edi // ffd3 | call ebx // 6800020000 | push 0x200 // 8d85fcfdffff | lea eax, [ebp - 0x204] // 6a00 | push 0 // 50 | push eax $sequence_9 = { 6800020000 8d85fcfdffff 6a00 50 e8???????? 83c40c be01080000 } // n = 7, score = 100 // 6800020000 | push 0x200 // 8d85fcfdffff | lea eax, [ebp - 0x204] // 6a00 | push 0 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // be01080000 | mov esi, 0x801 condition: 7 of them and filesize < 65536 }
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