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rule win_darkrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 897dd8 895ddc 8b4104 8b743820 } // n = 4, score = 200 // 897dd8 | mov dword ptr [ebp - 0x28], edi // 895ddc | mov dword ptr [ebp - 0x24], ebx // 8b4104 | mov eax, dword ptr [ecx + 4] // 8b743820 | mov esi, dword ptr [eax + edi + 0x20] $sequence_1 = { 8bcb e8???????? 8b75b8 c645fc01 } // n = 4, score = 200 // 8bcb | mov ecx, ebx // e8???????? | // 8b75b8 | mov esi, dword ptr [ebp - 0x48] // c645fc01 | mov byte ptr [ebp - 4], 1 $sequence_2 = { 837de810 56 8b10 895510 8b4804 } // n = 5, score = 200 // 837de810 | cmp dword ptr [ebp - 0x18], 0x10 // 56 | push esi // 8b10 | mov edx, dword ptr [eax] // 895510 | mov dword ptr [ebp + 0x10], edx // 8b4804 | mov ecx, dword ptr [eax + 4] $sequence_3 = { e8???????? 83cf02 897dd4 c645fc02 8d55b8 837dcc10 } // n = 6, score = 200 // e8???????? | // 83cf02 | or edi, 2 // 897dd4 | mov dword ptr [ebp - 0x2c], edi // c645fc02 | mov byte ptr [ebp - 4], 2 // 8d55b8 | lea edx, [ebp - 0x48] // 837dcc10 | cmp dword ptr [ebp - 0x34], 0x10 $sequence_4 = { c60000 be???????? 6a06 894708 } // n = 4, score = 200 // c60000 | mov byte ptr [eax], 0 // be???????? | // 6a06 | push 6 // 894708 | mov dword ptr [edi + 8], eax $sequence_5 = { 897dd4 c645fc02 8d55b8 837dcc10 8b75b8 } // n = 5, score = 200 // 897dd4 | mov dword ptr [ebp - 0x2c], edi // c645fc02 | mov byte ptr [ebp - 4], 2 // 8d55b8 | lea edx, [ebp - 0x48] // 837dcc10 | cmp dword ptr [ebp - 0x34], 0x10 // 8b75b8 | mov esi, dword ptr [ebp - 0x48] $sequence_6 = { c645fc01 8b45cc 83f810 7227 8d4801 } // n = 5, score = 200 // c645fc01 | mov byte ptr [ebp - 4], 1 // 8b45cc | mov eax, dword ptr [ebp - 0x34] // 83f810 | cmp eax, 0x10 // 7227 | jb 0x29 // 8d4801 | lea ecx, [eax + 1] $sequence_7 = { 8938 e8???????? b804000000 8b4df4 } // n = 4, score = 200 // 8938 | mov dword ptr [eax], edi // e8???????? | // b804000000 | mov eax, 4 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_8 = { 8bcb e8???????? 8b75b8 c645fc01 8b45cc 83f810 7227 } // n = 7, score = 200 // 8bcb | mov ecx, ebx // e8???????? | // 8b75b8 | mov esi, dword ptr [ebp - 0x48] // c645fc01 | mov byte ptr [ebp - 4], 1 // 8b45cc | mov eax, dword ptr [ebp - 0x34] // 83f810 | cmp eax, 0x10 // 7227 | jb 0x29 $sequence_9 = { 6802000080 ff15???????? 85c0 7470 83f802 756b 6a05 } // n = 7, score = 200 // 6802000080 | push 0x80000002 // ff15???????? | // 85c0 | test eax, eax // 7470 | je 0x72 // 83f802 | cmp eax, 2 // 756b | jne 0x6d // 6a05 | push 5 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*) }
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