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

Static analysis result for SHA-256 66d95a630376c2ac…

MALICIOUS

Office (OLE) / .DOCX

174.9 KB Created: 2020-09-17 20:07:00 Authoring application: Microsoft Office Word
MD5: d6c87b0a5960f6db4efb85d0583b5b98 SHA-1: 0ef3bb8e0481ab44835786f690910df863d72e0a SHA-256: 66d95a630376c2acfd2946fcec3ec5d5e076028bf1c48c388939a3f054c1a6b7
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is a Microsoft Office document containing VBA macros, with a high-confidence heuristic indicating the presence of a Document_Open auto-execution macro. The script attempts to construct a string using mid-string operations on a large, obfuscated string, likely to form a URL or command for downloading a secondary payload. The ClamAV detection also flags it as a downloader.

Heuristics 6

  • ClamAV: Doc.Downloader.Generic-9763054-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9763054-0
  • 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.
  • 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
620e9eb15c32ed012e3e43742d6a5833fa906ea09e2bf7ca9f4f384d7210c8d6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 21992 bytes

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