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rule win_bredolab_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 31db ff15???????? 88d8 8d65f4 } // n = 4, score = 200 // 31db | xor ebx, ebx // ff15???????? | // 88d8 | mov al, bl // 8d65f4 | lea esp, [ebp - 0xc] $sequence_1 = { e8???????? 8d45e0 89442420 8d45e4 } // n = 4, score = 200 // e8???????? | // 8d45e0 | lea eax, [ebp - 0x20] // 89442420 | mov dword ptr [esp + 0x20], eax // 8d45e4 | lea eax, [ebp - 0x1c] $sequence_2 = { 741f 3b5510 7310 89d6 8b4510 } // n = 5, score = 200 // 741f | je 0x21 // 3b5510 | cmp edx, dword ptr [ebp + 0x10] // 7310 | jae 0x12 // 89d6 | mov esi, edx // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_3 = { 8b45c8 89442404 891c24 ff15???????? 83ec28 85c0 } // n = 6, score = 200 // 8b45c8 | mov eax, dword ptr [ebp - 0x38] // 89442404 | mov dword ptr [esp + 4], eax // 891c24 | mov dword ptr [esp], ebx // ff15???????? | // 83ec28 | sub esp, 0x28 // 85c0 | test eax, eax $sequence_4 = { 890424 ff15???????? 83ec08 43 89d8 83fb50 75dc } // n = 7, score = 200 // 890424 | mov dword ptr [esp], eax // ff15???????? | // 83ec08 | sub esp, 8 // 43 | inc ebx // 89d8 | mov eax, ebx // 83fb50 | cmp ebx, 0x50 // 75dc | jne 0xffffffde $sequence_5 = { 8b35???????? 897c2404 c704241b000000 e8???????? c744241404000000 8b955cfeffff } // n = 6, score = 200 // 8b35???????? | // 897c2404 | mov dword ptr [esp + 4], edi // c704241b000000 | mov dword ptr [esp], 0x1b // e8???????? | // c744241404000000 | mov dword ptr [esp + 0x14], 4 // 8b955cfeffff | mov edx, dword ptr [ebp - 0x1a4] $sequence_6 = { 8b0d???????? 8b8584fdffff d3e0 89442404 893c24 ff15???????? } // n = 6, score = 200 // 8b0d???????? | // 8b8584fdffff | mov eax, dword ptr [ebp - 0x27c] // d3e0 | shl eax, cl // 89442404 | mov dword ptr [esp + 4], eax // 893c24 | mov dword ptr [esp], edi // ff15???????? | $sequence_7 = { 31d2 f7b544ffffff 8d0c08 884de4 8b15???????? 85d2 } // n = 6, score = 200 // 31d2 | xor edx, edx // f7b544ffffff | div dword ptr [ebp - 0xbc] // 8d0c08 | lea ecx, [eax + ecx] // 884de4 | mov byte ptr [ebp - 0x1c], cl // 8b15???????? | // 85d2 | test edx, edx $sequence_8 = { c744240c00000000 c744240801000000 c744240400000040 8b5514 891424 ff15???????? 83ec1c } // n = 7, score = 200 // c744240c00000000 | mov dword ptr [esp + 0xc], 0 // c744240801000000 | mov dword ptr [esp + 8], 1 // c744240400000040 | mov dword ptr [esp + 4], 0x40000000 // 8b5514 | mov edx, dword ptr [ebp + 0x14] // 891424 | mov dword ptr [esp], edx // ff15???????? | // 83ec1c | sub esp, 0x1c $sequence_9 = { 89442414 8b4518 89442410 8d4514 8944240c } // n = 5, score = 200 // 89442414 | mov dword ptr [esp + 0x14], eax // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 89442410 | mov dword ptr [esp + 0x10], eax // 8d4514 | lea eax, [ebp + 0x14] // 8944240c | mov dword ptr [esp + 0xc], eax condition: 7 of them and filesize < 90112 }
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