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rule win_dinodas_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.dinodas_rat." 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.dinodas_rat" 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 = { 85c9 743b 8b10 8b04b2 8b400c 85c0 7409 } // n = 7, score = 100 // 85c9 | test ecx, ecx // 743b | je 0x3d // 8b10 | mov edx, dword ptr [eax] // 8b04b2 | mov eax, dword ptr [edx + esi*4] // 8b400c | mov eax, dword ptr [eax + 0xc] // 85c0 | test eax, eax // 7409 | je 0xb $sequence_1 = { 6a18 c705????????acff4300 c705????????00000000 e8???????? 83c404 85c0 } // n = 6, score = 100 // 6a18 | push 0x18 // c705????????acff4300 | // c705????????00000000 | // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax $sequence_2 = { 50 51 ffd3 83bdb85fffff00 75af 837e2c00 } // n = 6, score = 100 // 50 | push eax // 51 | push ecx // ffd3 | call ebx // 83bdb85fffff00 | cmp dword ptr [ebp - 0xa048], 0 // 75af | jne 0xffffffb1 // 837e2c00 | cmp dword ptr [esi + 0x2c], 0 $sequence_3 = { 833c0e00 755b 8b5dd4 8b4304 80781500 8bd3 7522 } // n = 7, score = 100 // 833c0e00 | cmp dword ptr [esi + ecx], 0 // 755b | jne 0x5d // 8b5dd4 | mov ebx, dword ptr [ebp - 0x2c] // 8b4304 | mov eax, dword ptr [ebx + 4] // 80781500 | cmp byte ptr [eax + 0x15], 0 // 8bd3 | mov edx, ebx // 7522 | jne 0x24 $sequence_4 = { df6df8 df6de0 def9 dc0d???????? dd45d8 d8d9 dfe0 } // n = 7, score = 100 // df6df8 | fild qword ptr [ebp - 8] // df6de0 | fild qword ptr [ebp - 0x20] // def9 | fdivp st(1) // dc0d???????? | // dd45d8 | fld qword ptr [ebp - 0x28] // d8d9 | fcomp st(1) // dfe0 | fnstsw ax $sequence_5 = { 83bdd4c3ffff10 7306 8d85c0c3ffff 56 50 57 e8???????? } // n = 7, score = 100 // 83bdd4c3ffff10 | cmp dword ptr [ebp - 0x3c2c], 0x10 // 7306 | jae 8 // 8d85c0c3ffff | lea eax, [ebp - 0x3c40] // 56 | push esi // 50 | push eax // 57 | push edi // e8???????? | $sequence_6 = { 8344241408 894c2420 83e908 89542434 8b542430 33db 8bf7 } // n = 7, score = 100 // 8344241408 | add dword ptr [esp + 0x14], 8 // 894c2420 | mov dword ptr [esp + 0x20], ecx // 83e908 | sub ecx, 8 // 89542434 | mov dword ptr [esp + 0x34], edx // 8b542430 | mov edx, dword ptr [esp + 0x30] // 33db | xor ebx, ebx // 8bf7 | mov esi, edi $sequence_7 = { 8b55d0 8b45cc 8b4dec 2bd0 41 c1fa02 894dec } // n = 7, score = 100 // 8b55d0 | mov edx, dword ptr [ebp - 0x30] // 8b45cc | mov eax, dword ptr [ebp - 0x34] // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 2bd0 | sub edx, eax // 41 | inc ecx // c1fa02 | sar edx, 2 // 894dec | mov dword ptr [ebp - 0x14], ecx $sequence_8 = { e8???????? 8b8d6cffffff 8bb568ffffff 2bce b893244992 f7e9 03d1 } // n = 7, score = 100 // e8???????? | // 8b8d6cffffff | mov ecx, dword ptr [ebp - 0x94] // 8bb568ffffff | mov esi, dword ptr [ebp - 0x98] // 2bce | sub ecx, esi // b893244992 | mov eax, 0x92492493 // f7e9 | imul ecx // 03d1 | add edx, ecx $sequence_9 = { 7546 8b15???????? 6aff 52 ffd7 8d5d08 8d45f8 } // n = 7, score = 100 // 7546 | jne 0x48 // 8b15???????? | // 6aff | push -1 // 52 | push edx // ffd7 | call edi // 8d5d08 | lea ebx, [ebp + 8] // 8d45f8 | lea eax, [ebp - 8] condition: 7 of them and filesize < 638976 }
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