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rule win_dexter_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.dexter." 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.dexter" 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 = { 8b0d???????? 51 e8???????? 83c40c eb1a 6a00 } // n = 6, score = 400 // 8b0d???????? | // 51 | push ecx // e8???????? | // 83c40c | add esp, 0xc // eb1a | jmp 0x1c // 6a00 | push 0 $sequence_1 = { 83f801 7411 68???????? 8b4d08 } // n = 4, score = 400 // 83f801 | cmp eax, 1 // 7411 | je 0x13 // 68???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_2 = { ff15???????? 8945fc 8b4dfc d1e1 51 6a08 8b15???????? } // n = 7, score = 400 // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // d1e1 | shl ecx, 1 // 51 | push ecx // 6a08 | push 8 // 8b15???????? | $sequence_3 = { c705????????00000000 68???????? ff15???????? 837d0801 } // n = 4, score = 400 // c705????????00000000 | // 68???????? | // ff15???????? | // 837d0801 | cmp dword ptr [ebp + 8], 1 $sequence_4 = { 6a00 6a00 6a06 8b15???????? 52 } // n = 5, score = 400 // 6a00 | push 0 // 6a00 | push 0 // 6a06 | push 6 // 8b15???????? | // 52 | push edx $sequence_5 = { 83ec0c 8b4508 0fbe08 83f928 7404 33c0 eb3e } // n = 7, score = 400 // 83ec0c | sub esp, 0xc // 8b4508 | mov eax, dword ptr [ebp + 8] // 0fbe08 | movsx ecx, byte ptr [eax] // 83f928 | cmp ecx, 0x28 // 7404 | je 6 // 33c0 | xor eax, eax // eb3e | jmp 0x40 $sequence_6 = { 50 ff15???????? 68e8030000 ff15???????? e9???????? 833d????????00 741e } // n = 7, score = 400 // 50 | push eax // ff15???????? | // 68e8030000 | push 0x3e8 // ff15???????? | // e9???????? | // 833d????????00 | // 741e | je 0x20 $sequence_7 = { eb44 8b4510 8a4dfa 8808 8b5510 } // n = 5, score = 400 // eb44 | jmp 0x46 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 8a4dfa | mov cl, byte ptr [ebp - 6] // 8808 | mov byte ptr [eax], cl // 8b5510 | mov edx, dword ptr [ebp + 0x10] $sequence_8 = { 50 ff15???????? e9???????? 6a59 ff15???????? } // n = 5, score = 400 // 50 | push eax // ff15???????? | // e9???????? | // 6a59 | push 0x59 // ff15???????? | $sequence_9 = { 51 ff15???????? 6aff 8b15???????? 52 } // n = 5, score = 400 // 51 | push ecx // ff15???????? | // 6aff | push -1 // 8b15???????? | // 52 | push edx condition: 7 of them and filesize < 98304 }
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