There is no description at this point.
rule win_darkrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.darkrat." 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.darkrat" 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 = { 837de810 895510 8b4804 8d45d4 0f4345d4 2975b4 } // n = 6, score = 200 // 837de810 | cmp dword ptr [ebp - 0x18], 0x10 // 895510 | mov dword ptr [ebp + 0x10], edx // 8b4804 | mov ecx, dword ptr [eax + 4] // 8d45d4 | lea eax, [ebp - 0x2c] // 0f4345d4 | cmovae eax, dword ptr [ebp - 0x2c] // 2975b4 | sub dword ptr [ebp - 0x4c], esi $sequence_1 = { 51 03f8 52 57 e8???????? 8b45c8 83c40c } // n = 7, score = 200 // 51 | push ecx // 03f8 | add edi, eax // 52 | push edx // 57 | push edi // e8???????? | // 8b45c8 | mov eax, dword ptr [ebp - 0x38] // 83c40c | add esp, 0xc $sequence_2 = { 51 56 e8???????? 83c40c c6043e00 eb17 57 } // n = 7, score = 200 // 51 | push ecx // 56 | push esi // e8???????? | // 83c40c | add esp, 0xc // c6043e00 | mov byte ptr [esi + edi], 0 // eb17 | jmp 0x19 // 57 | push edi $sequence_3 = { 8b7dd4 0f8514ffffff 8b55ec 83fa10 } // n = 4, score = 200 // 8b7dd4 | mov edi, dword ptr [ebp - 0x2c] // 0f8514ffffff | jne 0xffffff1a // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 83fa10 | cmp edx, 0x10 $sequence_4 = { 8bd0 b805000000 2bd6 8a0e 8d7601 884c32ff 83e801 } // n = 7, score = 200 // 8bd0 | mov edx, eax // b805000000 | mov eax, 5 // 2bd6 | sub edx, esi // 8a0e | mov cl, byte ptr [esi] // 8d7601 | lea esi, [esi + 1] // 884c32ff | mov byte ptr [edx + esi - 1], cl // 83e801 | sub eax, 1 $sequence_5 = { e8???????? 83c408 c745e800000000 8d4dd8 } // n = 4, score = 200 // e8???????? | // 83c408 | add esp, 8 // c745e800000000 | mov dword ptr [ebp - 0x18], 0 // 8d4dd8 | lea ecx, [ebp - 0x28] $sequence_6 = { 0b510c 52 e8???????? c745fc04000000 e8???????? 84c0 7507 } // n = 7, score = 200 // 0b510c | or edx, dword ptr [ecx + 0xc] // 52 | push edx // e8???????? | // c745fc04000000 | mov dword ptr [ebp - 4], 4 // e8???????? | // 84c0 | test al, al // 7507 | jne 9 $sequence_7 = { 83c408 c745e800000000 8d4dd8 c745ec0f000000 c645d800 } // n = 5, score = 200 // 83c408 | add esp, 8 // c745e800000000 | mov dword ptr [ebp - 0x18], 0 // 8d4dd8 | lea ecx, [ebp - 0x28] // c745ec0f000000 | mov dword ptr [ebp - 0x14], 0xf // c645d800 | mov byte ptr [ebp - 0x28], 0 $sequence_8 = { ff75d0 51 8bcb e8???????? 8b75b8 c645fc01 } // n = 6, score = 200 // ff75d0 | push dword ptr [ebp - 0x30] // 51 | push ecx // 8bcb | mov ecx, ebx // e8???????? | // 8b75b8 | mov esi, dword ptr [ebp - 0x48] // c645fc01 | mov byte ptr [ebp - 4], 1 $sequence_9 = { 895510 8b4804 8d45d4 0f4345d4 2975b4 03c6 ff75b4 } // n = 7, score = 200 // 895510 | mov dword ptr [ebp + 0x10], edx // 8b4804 | mov ecx, dword ptr [eax + 4] // 8d45d4 | lea eax, [ebp - 0x2c] // 0f4345d4 | cmovae eax, dword ptr [ebp - 0x2c] // 2975b4 | sub dword ptr [ebp - 0x4c], esi // 03c6 | add eax, esi // ff75b4 | push dword ptr [ebp - 0x4c] condition: 7 of them and filesize < 884736 }
rule win_darkrat_w0 { meta: author = "Albert Zsigovits" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.darkrat" malpedia_version = "20191012" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $pdb = "C:\\Users\\darkspider" ascii wide $cmd = "cmd.exe /C ping 127.0.0.1 -n 1 -w 3000 > Nul & Del /f /q \"%s\"" ascii wide $guid1 = "SOFTWARE\\Microsoft\\Cryptography" ascii wide $guid2 = "MachineGuid" ascii wide $persi1 = "Software\\Microsoft\\Windows\\CurrentVersion\\Run" ascii wide $persi2 = "WinSystem32" ascii wide $bin = "pastebin.com/raw/" ascii wide $import0 = "NtUnmapViewOfSection" ascii wide $import1 = "WriteProcessMemory" ascii wide $import2 = "ResumeThread" ascii wide $import3 = "GetNativeSystemInfo" ascii wide $import4 = "URLOpenBlockingStream" ascii wide $import5 = "VirtualFree" ascii wide $import6 = "VirtualAlloc" ascii wide $import7 = "GetModuleHandle" ascii wide $import8 = "LoadLibrary" ascii wide $import9 = "CreateMutex" ascii wide $vbs0 = "Set objShell = WScript.CreateObject(\"WScript.Shell\")" ascii wide $vbs1 = "Set objWMIService = GetObject(\"winmgmts:\\\\\" & sComputerName & \"\\root\\cimv2\")" ascii wide $vbs2 = "Set objItems = objWMIService.ExecQuery(sQuery)" ascii wide $vbs3 = "sQuery = \"SELECT * FROM Win32_Process\"" ascii wide $vbs4 = "wscript.exe" ascii wide $net0 = "POST" ascii wide $net1 = "&taskid=" ascii wide $net2 = "&taskstatus=" ascii wide $net3 = "&spreadtag=" ascii wide $net4 = "&operingsystem=" ascii wide $net5 = "&arch=" ascii wide $net6 = "&cpuName=" ascii wide $net7 = "&gpuName=" ascii wide $net8 = "&botversion=" ascii wide $net9 = "&antivirus=" ascii wide $net10 = "&netFramework4=" ascii wide $net11 = "&netFramework35=" ascii wide $net12 = "&netFramework3=" ascii wide $net13 = "&netFramework2=" ascii wide $net14 = "&installedRam=" ascii wide $net15 = "&aornot=" ascii wide $net16 = "&computername=" ascii wide $net17 = "hwid=" ascii wide $net18 = "request=" ascii wide condition: $pdb or $cmd or ( all of ($guid*) and all of ($persi*) ) or ( 3 of ($vbs*) ) or ( all of ($import*) and $bin ) or ( all of ($net*) ) }
rule win_darkrat_w1 { meta: description = "Darkrat" author = "James_inthe_box" reference = "https://github.com/albertzsigovits/malware-writeups/tree/master/DarkRATv2" date = "2019/08" maltype = "RAT" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.darkrat" malpedia_version = "20191012" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $string1 = "Set objShell = WScript.CreateObject(\"WScript.Shell\")" $string2 = "&taskstatus=" $string3 = "network reset" $string4 = "text/plain" $string5 = "&antivirus=" $string6 = "request=" $string7 = "&arch=" condition: all of ($string*) }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below. Changes regarding references should be proposed on the Malpedia library page.
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY