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rule win_darkloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { e8???????? 8bb42434020000 c1e607 68???????? 89b42438020000 8dbe10a10010 } // n = 6, score = 100 // e8???????? | // 8bb42434020000 | mov esi, dword ptr [esp + 0x234] // c1e607 | shl esi, 7 // 68???????? | // 89b42438020000 | mov dword ptr [esp + 0x238], esi // 8dbe10a10010 | lea edi, [esi + 0x1000a110] $sequence_1 = { c70424???????? e8???????? c70424???????? 8bf8 56 e8???????? } // n = 6, score = 100 // c70424???????? | // e8???????? | // c70424???????? | // 8bf8 | mov edi, eax // 56 | push esi // e8???????? | $sequence_2 = { 51 ff36 8b00 8b00 8986b0010000 ff96bc010000 } // n = 6, score = 100 // 51 | push ecx // ff36 | push dword ptr [esi] // 8b00 | mov eax, dword ptr [eax] // 8b00 | mov eax, dword ptr [eax] // 8986b0010000 | mov dword ptr [esi + 0x1b0], eax // ff96bc010000 | call dword ptr [esi + 0x1bc] $sequence_3 = { 57 ff74241c e8???????? 03c3 0fb73470 } // n = 5, score = 100 // 57 | push edi // ff74241c | push dword ptr [esp + 0x1c] // e8???????? | // 03c3 | add eax, ebx // 0fb73470 | movzx esi, word ptr [eax + esi*2] $sequence_4 = { 3c5f 7447 3c2e 7443 3c7e } // n = 5, score = 100 // 3c5f | cmp al, 0x5f // 7447 | je 0x49 // 3c2e | cmp al, 0x2e // 7443 | je 0x45 // 3c7e | cmp al, 0x7e $sequence_5 = { 8b7c240c 8bcf 8906 8d5101 8a01 41 84c0 } // n = 7, score = 100 // 8b7c240c | mov edi, dword ptr [esp + 0xc] // 8bcf | mov ecx, edi // 8906 | mov dword ptr [esi], eax // 8d5101 | lea edx, [ecx + 1] // 8a01 | mov al, byte ptr [ecx] // 41 | inc ecx // 84c0 | test al, al $sequence_6 = { 84c0 740b 80f90d 7519 } // n = 4, score = 100 // 84c0 | test al, al // 740b | je 0xd // 80f90d | cmp cl, 0xd // 7519 | jne 0x1b $sequence_7 = { 894c241c 85c9 0f84b3000000 8b4020 } // n = 4, score = 100 // 894c241c | mov dword ptr [esp + 0x1c], ecx // 85c9 | test ecx, ecx // 0f84b3000000 | je 0xb9 // 8b4020 | mov eax, dword ptr [eax + 0x20] $sequence_8 = { 6bc503 40 50 e8???????? be???????? 8d7c2418 } // n = 6, score = 100 // 6bc503 | imul eax, ebp, 3 // 40 | inc eax // 50 | push eax // e8???????? | // be???????? | // 8d7c2418 | lea edi, [esp + 0x18] $sequence_9 = { 83c428 50 6a40 6a05 53 ffd6 } // n = 6, score = 100 // 83c428 | add esp, 0x28 // 50 | push eax // 6a40 | push 0x40 // 6a05 | push 5 // 53 | push ebx // ffd6 | call esi condition: 7 of them and filesize < 124928 }
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