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rule win_bredolab_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.bredolab." 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.bredolab" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 31d2 f775e4 890424 ffd1 } // n = 4, score = 200 // 31d2 | xor edx, edx // f775e4 | div dword ptr [ebp - 0x1c] // 890424 | mov dword ptr [esp], eax // ffd1 | call ecx $sequence_1 = { 29955cffffff 8b5d10 43 899d68ffffff } // n = 4, score = 200 // 29955cffffff | sub dword ptr [ebp - 0xa4], edx // 8b5d10 | mov ebx, dword ptr [ebp + 0x10] // 43 | inc ebx // 899d68ffffff | mov dword ptr [ebp - 0x98], ebx $sequence_2 = { e8???????? 89742404 c704241e000000 89853cfcffff e8???????? 8b4d08 } // n = 6, score = 200 // e8???????? | // 89742404 | mov dword ptr [esp + 4], esi // c704241e000000 | mov dword ptr [esp], 0x1e // 89853cfcffff | mov dword ptr [ebp - 0x3c4], eax // e8???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_3 = { 89542410 c744240c03000000 c744240800000000 895c2404 890424 e8???????? 83c430 } // n = 7, score = 200 // 89542410 | mov dword ptr [esp + 0x10], edx // c744240c03000000 | mov dword ptr [esp + 0xc], 3 // c744240800000000 | mov dword ptr [esp + 8], 0 // 895c2404 | mov dword ptr [esp + 4], ebx // 890424 | mov dword ptr [esp], eax // e8???????? | // 83c430 | add esp, 0x30 $sequence_4 = { 75f6 894d14 8b5d14 c60300 } // n = 4, score = 200 // 75f6 | jne 0xfffffff8 // 894d14 | mov dword ptr [ebp + 0x14], ecx // 8b5d14 | mov ebx, dword ptr [ebp + 0x14] // c60300 | mov byte ptr [ebx], 0 $sequence_5 = { 8b15???????? d3e2 8d0c0a 880b 43 8a08 84c9 } // n = 7, score = 200 // 8b15???????? | // d3e2 | shl edx, cl // 8d0c0a | lea ecx, [edx + ecx] // 880b | mov byte ptr [ebx], cl // 43 | inc ebx // 8a08 | mov cl, byte ptr [eax] // 84c9 | test cl, cl $sequence_6 = { 807c3da800 7412 83c308 8b03 } // n = 4, score = 200 // 807c3da800 | cmp byte ptr [ebp + edi - 0x58], 0 // 7412 | je 0x14 // 83c308 | add ebx, 8 // 8b03 | mov eax, dword ptr [ebx] $sequence_7 = { 89442410 8b4514 8944240c c744240800000000 89742404 } // n = 5, score = 200 // 89442410 | mov dword ptr [esp + 0x10], eax // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 8944240c | mov dword ptr [esp + 0xc], eax // c744240800000000 | mov dword ptr [esp + 8], 0 // 89742404 | mov dword ptr [esp + 4], esi $sequence_8 = { 83ec08 8903 83c304 8b955cffffff 83c204 46 8b8560ffffff } // n = 7, score = 200 // 83ec08 | sub esp, 8 // 8903 | mov dword ptr [ebx], eax // 83c304 | add ebx, 4 // 8b955cffffff | mov edx, dword ptr [ebp - 0xa4] // 83c204 | add edx, 4 // 46 | inc esi // 8b8560ffffff | mov eax, dword ptr [ebp - 0xa0] $sequence_9 = { e8???????? 8b4508 89442404 891c24 e8???????? 84c0 7424 } // n = 7, score = 200 // e8???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] // 89442404 | mov dword ptr [esp + 4], eax // 891c24 | mov dword ptr [esp], ebx // e8???????? | // 84c0 | test al, al // 7424 | je 0x26 condition: 7 of them and filesize < 90112 }
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