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

Static analysis result for SHA-256 989ecb06781cffce…

MALICIOUS

Office (OLE) / .DOC

86.0 KB Created: 2021-08-27 10:57:00 Authoring application: Microsoft Office Word
MD5: 89b5f91af14e08271e75349b3464961b SHA-1: 4095425b32ce302e805e4780f47435866d459b29 SHA-256: 989ecb06781cffce6474ee082975c309da2d4f6a020d1a19060cafe51cbc157f
182 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The 'autoOpen' macro is triggered upon opening the document, which then calls the 'startDate' subroutine. This subroutine constructs a filename by concatenating a dot, an empty string, and 'HTA', resulting in the filename '.HTA'. It then writes the content of the document (after removing '8s3i') to this file and executes it using WshShell.run. This indicates a downloader functionality, likely to fetch and execute a second-stage payload.

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
d1ce7f54d157dc93f4362b370dd4665bb47703adaca4c8dd7dcc07f35bca8971		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 873 bytes

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