Malicious Office (OLE) / .DOCX — malware analysis report

Static analysis result for SHA-256 9cafe1ff820182f2…

MALICIOUS

Office (OLE) / .DOCX

43.0 KB Created: 2021-09-18 12:02:00 Authoring application: Microsoft Office Word
MD5: 167949ba90da85c8b56878d95be19c1a SHA-1: d9d0e6f1f0d368d77897c784faf73019b36fbbe9 SHA-256: 9cafe1ff820182f2d33d662bc3b4018caf27c49d50242573f9620f06001c582f
540 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1053.005 Scheduled Task/Job

The document contains VBA macros, including AutoOpen and Document_Open, which are designed to execute automatically when the document is opened. Heuristics indicate the use of WScript.Shell and PowerShell, suggesting the macros attempt to download and execute a second-stage payload. The presence of the 'macros.bas' file and the ClamAV detection 'Doc.Downloader.Pwshell-10001336-0' further support this conclusion. The document body uses a COVID-19 survey as a lure to encourage macro execution.

Heuristics 13

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c56c374a4330f4d042fe01ece399dc177e499a42838e533bf04f98c79fa175f4		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6055 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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