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rule win_darkloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.darkloader." 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.darkloader" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 68???????? e8???????? 8bf0 e8???????? 50 56 e8???????? } // n = 7, score = 100 // 68???????? | // e8???????? | // 8bf0 | mov esi, eax // e8???????? | // 50 | push eax // 56 | push esi // e8???????? | $sequence_1 = { 0f44c6 89442414 80f90a 7506 807b010d } // n = 5, score = 100 // 0f44c6 | cmove eax, esi // 89442414 | mov dword ptr [esp + 0x14], eax // 80f90a | cmp cl, 0xa // 7506 | jne 8 // 807b010d | cmp byte ptr [ebx + 1], 0xd $sequence_2 = { c705????????01000000 6a04 58 6bc000 c7804ce1001002000000 6a04 } // n = 6, score = 100 // c705????????01000000 | // 6a04 | push 4 // 58 | pop eax // 6bc000 | imul eax, eax, 0 // c7804ce1001002000000 | mov dword ptr [eax + 0x1000e14c], 2 // 6a04 | push 4 $sequence_3 = { 68???????? 50 ff15???????? 83c40c 8d8500fcffff } // n = 5, score = 100 // 68???????? | // 50 | push eax // ff15???????? | // 83c40c | add esp, 0xc // 8d8500fcffff | lea eax, dword ptr [ebp - 0x400] $sequence_4 = { ffd6 68???????? ffb7dc010000 89470c ffd6 8987a8010000 } // n = 6, score = 100 // ffd6 | call esi // 68???????? | // ffb7dc010000 | push dword ptr [edi + 0x1dc] // 89470c | mov dword ptr [edi + 0xc], eax // ffd6 | call esi // 8987a8010000 | mov dword ptr [edi + 0x1a8], eax $sequence_5 = { ffd6 68???????? ffb7dc010000 8987bc010000 ffd6 68???????? } // n = 6, score = 100 // ffd6 | call esi // 68???????? | // ffb7dc010000 | push dword ptr [edi + 0x1dc] // 8987bc010000 | mov dword ptr [edi + 0x1bc], eax // ffd6 | call esi // 68???????? | $sequence_6 = { 88040a 41 84c0 75f6 ff742410 46 83ef80 } // n = 7, score = 100 // 88040a | mov byte ptr [edx + ecx], al // 41 | inc ecx // 84c0 | test al, al // 75f6 | jne 0xfffffff8 // ff742410 | push dword ptr [esp + 0x10] // 46 | inc esi // 83ef80 | sub edi, -0x80 $sequence_7 = { 8a043e 3c2d 744b 3c5f 7447 } // n = 5, score = 100 // 8a043e | mov al, byte ptr [esi + edi] // 3c2d | cmp al, 0x2d // 744b | je 0x4d // 3c5f | cmp al, 0x5f // 7447 | je 0x49 $sequence_8 = { 6a08 8bf8 be???????? 59 8d442414 f3a5 } // n = 6, score = 100 // 6a08 | push 8 // 8bf8 | mov edi, eax // be???????? | // 59 | pop ecx // 8d442414 | lea eax, dword ptr [esp + 0x14] // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] $sequence_9 = { e8???????? 8bd8 59 8bd3 } // n = 4, score = 100 // e8???????? | // 8bd8 | mov ebx, eax // 59 | pop ecx // 8bd3 | mov edx, ebx condition: 7 of them and filesize < 124928 }
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