Actor(s): APT34, Turla Group
There is no description at this point.
rule win_nautilus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.nautilus." 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.nautilus" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 7404 33c0 eb2b 4c8b4c2448 4c8bc3 ba01000000 488bce } // n = 7, score = 100 // 7404 | mov esp, edi // 33c0 | not eax // eb2b | inc esp // 4c8b4c2448 | xor esp, ebx // 4c8bc3 | rol edi, 7 // ba01000000 | or eax, edx // 488bce | inc esp $sequence_1 = { 8b8496d06b0800 440fa3c0 0f826cffffff e9???????? 498d4202 488903 b81c000000 } // n = 7, score = 100 // 8b8496d06b0800 | mov eax, 1 // 440fa3c0 | ret // 0f826cffffff | dec eax // e9???????? | // 498d4202 | test edx, edx // 488903 | je 0x382 // b81c000000 | test byte ptr [edx + 9], 3 $sequence_2 = { c1c804 3347fc 4433d2 448bc0 8bc8 48c1e810 83e03f } // n = 7, score = 100 // c1c804 | dec eax // 3347fc | sub esp, 0x40 // 4433d2 | dec ecx // 448bc0 | mov ebx, ecx // 8bc8 | dec eax // 48c1e810 | mov dword ptr [eax + 0x10], esi // 83e03f | dec eax $sequence_3 = { 751a 397b10 7515 44397b5c 736a 397b60 7e65 } // n = 7, score = 100 // 751a | inc esp // 397b10 | sub cl, al // 7515 | inc esp // 44397b5c | cmp eax, ecx // 736a | inc ecx // 397b60 | mov dword ptr [edx + 0xc], esi // 7e65 | setb al $sequence_4 = { eb07 8bd3 e8???????? 488be8 483bf0 7e04 33c0 } // n = 7, score = 100 // eb07 | mov dword ptr [ebx + 0x340], esp // 8bd3 | dec esp // e8???????? | // 488be8 | mov dword ptr [ebx + 0x358], esp // 483bf0 | dec esp // 7e04 | mov dword ptr [ebx + 0x350], esp // 33c0 | dec esp $sequence_5 = { 884c06ff 4c8933 4c896318 498b4608 48894310 41803f00 7519 } // n = 7, score = 100 // 884c06ff | dec ecx // 4c8933 | mov edx, esi // 4c896318 | dec eax // 498b4608 | mov ecx, esi // 48894310 | dec eax // 41803f00 | add esp, 0x20 // 7519 | inc ecx $sequence_6 = { 7416 488bcb 3d12010000 7407 e8???????? ebd0 e8???????? } // n = 7, score = 100 // 7416 | dec eax // 488bcb | mov ecx, ebx // 3d12010000 | inc esp // 7407 | cmp dword ptr [ebx + 8], ebp // e8???????? | // ebd0 | jne 0x12b1 // e8???????? | $sequence_7 = { e8???????? 81fbef030000 7515 e8???????? 488d15915f0300 488d4860 e8???????? } // n = 7, score = 100 // e8???????? | // 81fbef030000 | cmp edx, ecx // 7515 | jg 0x255 // e8???????? | // 488d15915f0300 | dec eax // 488d4860 | lea eax, [edx + 1] // e8???????? | $sequence_8 = { 743c 81e901010000 742d 83e90f 7421 83e907 7415 } // n = 7, score = 100 // 743c | dec esp // 81e901010000 | mov dword ptr [ebp - 0x49], edi // 742d | inc ebp // 83e90f | mov edx, edi // 7421 | inc esp // 83e907 | mov dword ptr [ebp - 1], edi // 7415 | inc ebp $sequence_9 = { 7407 498b06 48894830 49893e 488bcb 4c897730 e8???????? } // n = 7, score = 100 // 7407 | dec ecx // 498b06 | arpl cx, di // 48894830 | dec eax // 49893e | arpl si, ax // 488bcb | dec ecx // 4c897730 | add eax, eax // e8???????? | condition: 7 of them and filesize < 1302528 }
rule win_nautilus_w0 { meta: description = "Rule for detection of Nautilus based on assembly code for a modified RC4 loop" author = "NCSC UK" hash = "a415ab193f6cd832a0de4fcc48d5f53d6f0b06d5e13b3c359878c6c31f3e7ec3" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.nautilus" malpedia_version = "20180226" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $rc4_loop = {42 0F B6 14 04 41 FF C0 03 D7 0F B6 CA 8A 14 0C 43 32 14 13 41 88 12 49 FF C2 49 FF C9} $rc4_key = {31 42 31 34 34 30 44 39 30 46 43 39 42 43 42 34 36 41 39 41 43 39 36 34 33 38 46 45 45 41 38 42} $string_0 = "nautilus-service.dll" ascii $string_1 = "oxygen.dll" ascii $string_2 = "config_listen.system" ascii $string_3 = "ctx.system" ascii $string_4 = "3FDA3998-BEF5-426D-82D8-1A71F29ADDC3" ascii $string_5 = "C:\\ProgramData\\Microsoft\\Windows\\Caches\\{%s}.2.ver0x0000000000000001.db" condition: ($rc4_loop and $rc4_key) or (all of ($string_*)) }
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