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

Static analysis result for SHA-256 603d7730f21916f2…

MALICIOUS

Office (OLE) / .DOCX

165.8 KB Created: 2021-01-05 07:28:00 Authoring application: Microsoft Office Word
MD5: 07a3e6a6833340696c9149d1550e5b1a SHA-1: c0d191be98e758cffe0beee7eb10f8ca11b22c9a SHA-256: 603d7730f21916f22bff3d707e9aca62706ef588424f3e135db099388395091a
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains heavily obfuscated VBA macros, including a Document_Open auto-exec loader. These macros utilize CreateObject to interact with the file system, attempting to write arbitrary content to specific file paths. The ClamAV detection name 'Doc.Downloader.EmotetRed02224-9938637-0' suggests a downloader capability, likely for a second-stage payload.

Heuristics 7

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • ClamAV: Doc.Downloader.EmotetRed02224-9938637-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02224-9938637-0
  • 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
a19bea0b68e66c642d89ca357193de473f2db600ca0ce526dc79ce8aaabe41a9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10612 bytes

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