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

Static analysis result for SHA-256 6bdf3dc46d917b8c…

MALICIOUS

Office (OOXML) / .DOC

42.5 KB Created: 2021-12-15 09:23:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 6b93e6fbf934112199e2b5b752b73b2a SHA-1: 85a0a04199dbc4956049057c9724fc6e8b60dd71 SHA-256: 6bdf3dc46d917b8c039e3ce4dc6049856b0326460318fa1e348a36908789aed3
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

The sample contains VBA macros, including an AutoOpen subroutine, which is a common technique for executing malicious code upon opening a document. The script uses GetObject to execute a command, and the reconstructed command string indicates it attempts to write to the Run key for persistence. The ClamAV detection name 'Doc.Downloader' further supports the conclusion that this document is a downloader for a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Downloader.BlueWord12210-9915312-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord12210-9915312-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2012/wordml
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
cdac7ff4106d53fb7195c19edfa770a9338efbc0379bc7010a5ef04f85286d33		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 907 bytes
vbaProject_00.bin
d3f7a979d8e2560a8230f0c021e9cd7632258b568984c900e44768ba3764b8b3		 vba-project OOXML VBA project: word/vbaProject.bin 14336 bytes

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