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

Static analysis result for SHA-256 0b5aa55d0502cae2…

MALICIOUS

Office (OLE) / .DOC

86.5 KB Created: 2021-08-25 10:04:00 Authoring application: Microsoft Office Word
MD5: 7b2cef9b301b988c8851c11f1bf6dd67 SHA-1: c1606a091bbbb013294ad896fb825df9636fd1e9 SHA-256: 0b5aa55d0502cae259a322e67efa1f55eb2a1040cad14e91f1afe961e4df674d
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains a VBA macro with an AutoOpen subroutine that writes obfuscated content from the document body to a file named '.HTA'. It then executes this file using 'scriptrunner -appvscript'. This indicates a downloader or dropper functionality, aiming to execute a second-stage payload. The use of VBA macros and the AutoOpen technique are common for initial execution in malicious documents.

Heuristics 6

  • ClamAV: Doc.Downloader.BlueOffice08210-9889818-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueOffice08210-9889818-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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
4791ab00f34cfa96c227e6fa7297e9250935f72bd5af4fc01c969ed13fc3f1ac		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 817 bytes

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