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rule win_plurox_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.plurox." 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.plurox" 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 = { 0416 128bc606091a f6870f1a000000 e10d 21c9 8918 } // n = 6, score = 100 // 0416 | add al, 0x16 // 128bc606091a | adc cl, byte ptr [ebx + 0x1a0906c6] // f6870f1a000000 | test byte ptr [edi + 0x1a0f], 0 // e10d | loope 0xf // 21c9 | and ecx, ecx // 8918 | mov dword ptr [eax], ebx $sequence_1 = { 0a20 0816 ec bbf2000000 } // n = 4, score = 100 // 0a20 | or ah, byte ptr [eax] // 0816 | or byte ptr [esi], dl // ec | in al, dx // bbf2000000 | mov ebx, 0xf2 $sequence_2 = { 300f 353e0fee3c 031e 2200 } // n = 4, score = 100 // 300f | xor byte ptr [edi], cl // 353e0fee3c | xor eax, 0x3cee0f3e // 031e | add ebx, dword ptr [esi] // 2200 | and al, byte ptr [eax] $sequence_3 = { 624a8b 0416 128bc606091a f6870f1a000000 e10d 21c9 } // n = 6, score = 100 // 624a8b | bound ecx, qword ptr [edx - 0x75] // 0416 | add al, 0x16 // 128bc606091a | adc cl, byte ptr [ebx + 0x1a0906c6] // f6870f1a000000 | test byte ptr [edi + 0x1a0f], 0 // e10d | loope 0xf // 21c9 | and ecx, ecx $sequence_4 = { 94 f8 21480e 2a15???????? 6f } // n = 5, score = 100 // 94 | xchg eax, esp // f8 | clc // 21480e | and dword ptr [eax + 0xe], ecx // 2a15???????? | // 6f | outsd dx, dword ptr [esi] $sequence_5 = { 6808486409 58 0000 00e4 0487 58 } // n = 6, score = 100 // 6808486409 | push 0x9644808 // 58 | pop eax // 0000 | add byte ptr [eax], al // 00e4 | add ah, ah // 0487 | add al, 0x87 // 58 | pop eax $sequence_6 = { 0925???????? 0000 c48dcd713240 89f5 } // n = 4, score = 100 // 0925???????? | // 0000 | add byte ptr [eax], al // c48dcd713240 | les ecx, ptr [ebp + 0x403271cd] // 89f5 | mov ebp, esi $sequence_7 = { 0416 128bc606091a f6870f1a000000 e10d } // n = 4, score = 100 // 0416 | add al, 0x16 // 128bc606091a | adc cl, byte ptr [ebx + 0x1a0906c6] // f6870f1a000000 | test byte ptr [edi + 0x1a0f], 0 // e10d | loope 0xf $sequence_8 = { 0442 6808486409 58 0000 } // n = 4, score = 100 // 0442 | add al, 0x42 // 6808486409 | push 0x9644808 // 58 | pop eax // 0000 | add byte ptr [eax], al $sequence_9 = { 0d04b8ca08 6af3 dac9 0000 00ee } // n = 5, score = 100 // 0d04b8ca08 | or eax, 0x8cab804 // 6af3 | push -0xd // dac9 | fcmove st(0), st(1) // 0000 | add byte ptr [eax], al // 00ee | add dh, ch condition: 7 of them and filesize < 475136 }
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