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

Static analysis result for SHA-256 8b26c2b65753cbae…

MALICIOUS

Office (OLE) / .DOCX

68.0 KB Created: 2021-09-14 10:42:00 Authoring application: Microsoft Office Word
MD5: 20cd9c899dcde8bb326725f6faf52f21 SHA-1: 5b610b068e444b8bb73a0840f9f249a995ccdcd5 SHA-256: 8b26c2b65753cbae896c500d8745fbee672a5a6c036da3fd9eec675a3b1cac51
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros, specifically a Document_Open macro, which is designed to execute automatically when the document is opened. Heuristics indicate a lure to enable macros and that the macro executes a shell command. The script reconstructs the filename 'prevExUs.hta' and writes content to it, then executes it using 'explorer prevExUs.hta'. This suggests the macro's purpose is to download and execute a second-stage payload disguised as an HTA file.

Heuristics 6

  • ClamAV: Doc.Downloader.BluePaletteW09211-9893001-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BluePaletteW09211-9893001-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a3cc8b949d04aa661fbea04d027feabe7a9798283ed150859269a7d1d53c686b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 700 bytes

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