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

Static analysis result for SHA-256 6951461b231a0f4f…

MALICIOUS

Office (OLE) / .DOC

87.4 KB Created: 2021-01-13 12:11:00 Authoring application: Microsoft Office Word
MD5: b1c2a32cb28d07acc8b2d65ab2012db8 SHA-1: 3ac3123decd86944a576227554edbcbb3d62aa58 SHA-256: 6951461b231a0f4f2ee086768d3e5e79b30dd68efd55da80997d73c160e6ddce
202 Risk Score

Malware Insights

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

The sample contains heavily obfuscated VBA macros, including an auto-executing Document_Open subroutine. The script utilizes CreateObject and appears to be designed to download and execute a second-stage payload, indicated by the presence of obfuscated code and calls to execution sinks. The macro's logic involves string manipulation and potentially interacting with document content, but the primary intent is payload delivery.

Heuristics 6

  • 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.
  • 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
c19fee2018f615227f1ca17a4f6cc9eb7608a147ddaa58c9738da675125ba654		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10809 bytes

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