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Windows Analysis Report payment8642156.xlsb

Overview

General Information

Sample Name:payment8642156.xlsb
Analysis ID:528108
MD5:c0ba3e41c19da601eb852e9cd468012b
SHA1:151cad874dce5400b1cdb1a4f6114c296311f76a
SHA256:56e7b2005961a0726ac94e50ed03bfcad15700e3aee1be840ee2b827f7798680
Tags:xlsbxlsx
Infos:

Most interesting Screenshot:

Detection

Hidden Macro 4.0 Dridex Downloader
Score:84
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Yara detected Dridex Downloader
Creates and opens a fake document (probably a fake document to hide exploiting)
Found Excel 4.0 Macro with suspicious formulas
Sigma detected: Microsoft Office Product Spawning Windows Shell
Document exploit detected (process start blacklist hit)
Creates processes via WMI
Document exploit detected (UrlDownloadToFile)
Found protected and hidden Excel 4.0 Macro sheet
Contains functionality to create processes via WMI
Found obfuscated Excel 4.0 Macro
Found a hidden Excel 4.0 Macro sheet
Potential document exploit detected (unknown TCP traffic)
Searches for the Microsoft Outlook file path
Uses a known web browser user agent for HTTP communication
Yara detected Xls With Macro 4.0
Detected TCP or UDP traffic on non-standard ports
Sigma detected: Suspicious WMI Execution
Sample execution stops while process was sleeping (likely an evasion)
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Potential document exploit detected (performs HTTP gets)
IP address seen in connection with other malware

Classification

Process Tree

  • System is w10x64
  • EXCEL.EXE (PID: 5028 cmdline: "C:\Program Files (x86)\Microsoft Office\Office16\EXCEL.EXE" /automation -Embedding MD5: 5D6638F2C8F8571C593999C58866007E)
    • WMIC.exe (PID: 6112 cmdline: wmic process call create "mshta C:\ProgramData\XgQXeAWeoOU.rtf" MD5: 79A01FCD1C8166C5642F37D1E0FB7BA8)
      • conhost.exe (PID: 6252 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
  • mshta.exe (PID: 7096 cmdline: mshta C:\ProgramData\XgQXeAWeoOU.rtf MD5: 197FC97C6A843BEBB445C1D9C58DCBDB)
  • cleanup

Malware Configuration

No configs have been found

Yara Overview

Initial Sample

SourceRuleDescriptionAuthorStrings
app.xmlJoeSecurity_XlsWithMacro4Yara detected Xls With Macro 4.0Joe Security

    Dropped Files

    SourceRuleDescriptionAuthorStrings
    C:\ProgramData\XgQXeAWeoOU.rtfJoeSecurity_DridexDownloaderYara detected Dridex DownloaderJoe Security

      Sigma Overview

      System Summary:

      barindex
      Sigma detected: Microsoft Office Product Spawning Windows ShellShow sources
      Source: Process startedAuthor: Michael Haag, Florian Roth, Markus Neis, Elastic, FPT.EagleEye Team: Data: Command: wmic process call create "mshta C:\ProgramData\XgQXeAWeoOU.rtf", CommandLine: wmic process call create "mshta C:\ProgramData\XgQXeAWeoOU.rtf", CommandLine|base64offset|contains: h, Image: C:\Windows\SysWOW64\wbem\WMIC.exe, NewProcessName: C:\Windows\SysWOW64\wbem\WMIC.exe, OriginalFileName: C:\Windows\SysWOW64\wbem\WMIC.exe, ParentCommandLine: "C:\Program Files (x86)\Microsoft Office\Office16\EXCEL.EXE" /automation -Embedding, ParentImage: C:\Program Files (x86)\Microsoft Office\Office16\EXCEL.EXE, ParentProcessId: 5028, ProcessCommandLine: wmic process call create "mshta C:\ProgramData\XgQXeAWeoOU.rtf", ProcessId: 6112<