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rule win_dircrypt_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.dircrypt." 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.dircrypt" 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 = { 7531 c705????????01000000 e8???????? e8???????? 833d????????00 7514 68???????? } // n = 7, score = 900 // 7531 | jne 0x33 // c705????????01000000 | // e8???????? | // e8???????? | // 833d????????00 | // 7514 | jne 0x16 // 68???????? | $sequence_1 = { e8???????? e8???????? 68???????? ff15???????? 833d????????00 751a } // n = 6, score = 900 // e8???????? | // e8???????? | // 68???????? | // ff15???????? | // 833d????????00 | // 751a | jne 0x1c $sequence_2 = { 68???????? e8???????? 05d2070000 50 e8???????? a3???????? 6a13 } // n = 7, score = 900 // 68???????? | // e8???????? | // 05d2070000 | add eax, 0x7d2 // 50 | push eax // e8???????? | // a3???????? | // 6a13 | push 0x13 $sequence_3 = { 8bec 51 6a00 6a00 8d45fc 50 68???????? } // n = 7, score = 900 // 8bec | mov ebp, esp // 51 | push ecx // 6a00 | push 0 // 6a00 | push 0 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 68???????? | $sequence_4 = { 68???????? 8d45dc 50 e8???????? 6a00 e8???????? } // n = 6, score = 900 // 68???????? | // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax // e8???????? | // 6a00 | push 0 // e8???????? | $sequence_5 = { 6801000080 e8???????? e8???????? e8???????? e8???????? } // n = 5, score = 900 // 6801000080 | push 0x80000001 // e8???????? | // e8???????? | // e8???????? | // e8???????? | $sequence_6 = { e8???????? 05d5070000 50 6a01 6a02 6a08 } // n = 6, score = 900 // e8???????? | // 05d5070000 | add eax, 0x7d5 // 50 | push eax // 6a01 | push 1 // 6a02 | push 2 // 6a08 | push 8 $sequence_7 = { 68???????? 8d45dc 50 e8???????? 6a00 e8???????? 05d6070000 } // n = 7, score = 900 // 68???????? | // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax // e8???????? | // 6a00 | push 0 // e8???????? | // 05d6070000 | add eax, 0x7d6 $sequence_8 = { 833d????????00 7514 68???????? 68???????? e8???????? a3???????? 833d????????00 } // n = 7, score = 900 // 833d????????00 | // 7514 | jne 0x16 // 68???????? | // 68???????? | // e8???????? | // a3???????? | // 833d????????00 | $sequence_9 = { 51 6a00 6a00 8d45fc 50 68???????? 6802000080 } // n = 7, score = 900 // 51 | push ecx // 6a00 | push 0 // 6a00 | push 0 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 68???????? | // 6802000080 | push 0x80000002 condition: 7 of them and filesize < 671744 }
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