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rule win_proto8_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.proto8_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.proto8_rat" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8b8b94000000 4533c0 8b8390000000 3bc1 410f95c0 488b5c2430 4d85c0 } // n = 7, score = 100 // 8b8b94000000 | dec ecx // 4533c0 | lea esi, [esi + 0x20] // 8b8390000000 | mov eax, dword ptr [edi + 0x18] // 3bc1 | add eax, dword ptr [esi] // 410f95c0 | inc esp // 488b5c2430 | cmp edi, eax // 4d85c0 | jb 0x309 $sequence_1 = { 741a 48c70000000000 8b07 41894008 418b06 4189400c eb07 } // n = 7, score = 100 // 741a | mov ebx, dword ptr [esp + 0x30] // 48c70000000000 | dec eax // 8b07 | add esp, 0x20 // 41894008 | pop edi // 418b06 | ret // 4189400c | dec eax // eb07 | mov edx, ecx $sequence_2 = { ff15???????? 413bc5 7505 488bcb ebe3 48895d00 488b8dd8000000 } // n = 7, score = 100 // ff15???????? | // 413bc5 | jmp 0x2d // 7505 | movzx eax, byte ptr [ecx] // 488bcb | inc esp // ebe3 | cmp byte ptr [esp + eax + 0x20], bh // 48895d00 | jne 0x56 // 488b8dd8000000 | jne 0x16 $sequence_3 = { e8???????? 498bc5 488b9c24880a0000 4881c4400a0000 415f 415e 415d } // n = 7, score = 100 // e8???????? | // 498bc5 | dec eax // 488b9c24880a0000 | add eax, -8 // 4881c4400a0000 | dec eax // 415f | cmp eax, 0x1f // 415e | ja 0xf1e // 415d | jb 0x21c $sequence_4 = { 7406 488bd3 ff5318 488b8ff0010000 4885c9 7406 488bd3 } // n = 7, score = 100 // 7406 | mov eax, dword ptr [esp + 0x40] // 488bd3 | dec eax // ff5318 | mov ecx, edi // 488b8ff0010000 | dec eax // 4885c9 | lea ecx, [esp + 0x50] // 7406 | dec eax // 488bd3 | lea edx, [esp + 0x50] $sequence_5 = { e8???????? 4889842420010000 4885c0 742a 488918 488d7808 488d05dddbffff } // n = 7, score = 100 // e8???????? | // 4889842420010000 | dec eax // 4885c0 | inc edx // 742a | psrldq xmm2, 8 // 488918 | dec ax // 488d7808 | movd edx, mm2 // 488d05dddbffff | dec eax $sequence_6 = { 741c 4c8d0509b20300 baf7ffffff 488bcb e8???????? 448bf0 e9???????? } // n = 7, score = 100 // 741c | lea edx, [esp + 0x30] // 4c8d0509b20300 | dec eax // baf7ffffff | cmp dword ptr [esp + 0x48], 0x10 // 488bcb | dec eax // e8???????? | // 448bf0 | cmovae edx, dword ptr [esp + 0x30] // e9???????? | $sequence_7 = { e8???????? 33c0 4883c420 5b c3 ff25???????? ff25???????? } // n = 7, score = 100 // e8???????? | // 33c0 | dec eax // 4883c420 | inc ecx // 5b | mov eax, eax // c3 | pop ebp // ff25???????? | // ff25???????? | $sequence_8 = { ff5018 84c0 7406 48893b 488bfb 488bde 4885f6 } // n = 7, score = 100 // ff5018 | test ebx, ebx // 84c0 | inc ecx // 7406 | mov eax, 1 // 48893b | dec eax // 488bfb | lea edx, [0x11db94] // 488bde | mov ecx, eax // 4885f6 | shr ecx, 0x1e $sequence_9 = { 7578 40f6c701 742e 4c8bc3 498bd7 488bce e8???????? } // n = 7, score = 100 // 7578 | dec eax // 40f6c701 | cmp edx, ebp // 742e | jb 0x468 // 4c8bc3 | dec eax // 498bd7 | add edx, 0x27 // 488bce | dec esp // e8???????? | condition: 7 of them and filesize < 2537472 }
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