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rule win_batchwiper_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.batchwiper." 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.batchwiper" 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 = { 83c001 8bce c1e908 330c9de8904000 } // n = 4, score = 100 // 83c001 | add eax, 1 // 8bce | mov ecx, esi // c1e908 | shr ecx, 8 // 330c9de8904000 | xor ecx, dword ptr [ebx*4 + 0x4090e8] $sequence_1 = { 8b0424 894510 8b442408 894514 8b442404 } // n = 5, score = 100 // 8b0424 | mov eax, dword ptr [esp] // 894510 | mov dword ptr [ebp + 0x10], eax // 8b442408 | mov eax, dword ptr [esp + 8] // 894514 | mov dword ptr [ebp + 0x14], eax // 8b442404 | mov eax, dword ptr [esp + 4] $sequence_2 = { 8b442408 894514 8b442404 894518 8d44240c } // n = 5, score = 100 // 8b442408 | mov eax, dword ptr [esp + 8] // 894514 | mov dword ptr [ebp + 0x14], eax // 8b442404 | mov eax, dword ptr [esp + 4] // 894518 | mov dword ptr [ebp + 0x18], eax // 8d44240c | lea eax, [esp + 0xc] $sequence_3 = { e8???????? 50 31db 3b1c24 756b } // n = 5, score = 100 // e8???????? | // 50 | push eax // 31db | xor ebx, ebx // 3b1c24 | cmp ebx, dword ptr [esp] // 756b | jne 0x6d $sequence_4 = { 89d8 e8???????? 89c3 83fb01 7531 ff35???????? } // n = 6, score = 100 // 89d8 | mov eax, ebx // e8???????? | // 89c3 | mov ebx, eax // 83fb01 | cmp ebx, 1 // 7531 | jne 0x33 // ff35???????? | $sequence_5 = { 83fb01 7531 ff35???????? ba???????? e8???????? 8b15???????? e8???????? } // n = 7, score = 100 // 83fb01 | cmp ebx, 1 // 7531 | jne 0x33 // ff35???????? | // ba???????? | // e8???????? | // 8b15???????? | // e8???????? | $sequence_6 = { e8???????? 89c3 83fb01 7531 ff35???????? ba???????? } // n = 6, score = 100 // e8???????? | // 89c3 | mov ebx, eax // 83fb01 | cmp ebx, 1 // 7531 | jne 0x33 // ff35???????? | // ba???????? | $sequence_7 = { e8???????? 8d0d28b14000 5a e8???????? 8b15???????? ff35???????? e8???????? } // n = 7, score = 100 // e8???????? | // 8d0d28b14000 | lea ecx, [0x40b128] // 5a | pop edx // e8???????? | // 8b15???????? | // ff35???????? | // e8???????? | $sequence_8 = { ba???????? e8???????? 8d0d28b14000 5a e8???????? 8b15???????? ff35???????? } // n = 7, score = 100 // ba???????? | // e8???????? | // 8d0d28b14000 | lea ecx, [0x40b128] // 5a | pop edx // e8???????? | // 8b15???????? | // ff35???????? | $sequence_9 = { c705????????02000000 893d???????? c705????????dd424000 c705????????80464000 c705????????da464000 c705????????00474000 } // n = 6, score = 100 // c705????????02000000 | // 893d???????? | // c705????????dd424000 | // c705????????80464000 | // c705????????da464000 | // c705????????00474000 | condition: 7 of them and filesize < 270336 }
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