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

Static analysis result for SHA-256 b3426244bbc30449…

MALICIOUS

Office (OOXML) / .DOCX

22.9 KB Created: 2021-03-15 13:26:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 2c277c475456c40974d23545546470d4 SHA-1: 192a12012d94f14bbb27bd1a40db48276406a490 SHA-256: b3426244bbc30449efb0d38275032a46ca62287368b2ee4737b110989df545cc
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is a DOCX document containing VBA macros, specifically triggering a Document_Open macro. ClamAV detections indicate this is a known malicious macro. The presence of the Document_Open macro suggests an attempt to automatically execute malicious code when the document is opened, likely for downloading and executing a second-stage payload.

Heuristics 5

  • ClamAV: Doc.Macro.APMPKILL-6097118-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.APMPKILL-6097118-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
dbbb8b2eb2d03bf32a18c3cefba42cb473b2b9806a5cc5f203253c9cb28c6f04		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1045 bytes
vbaProject_00.bin
e69f4ce83db3137267b0e2c81fb0279cc36e1eb7fbc9662940309e82c4dee7c9		 vba-project OOXML VBA project: word/vbaProject.bin 12288 bytes
Detection
ClamAV: Doc.Macro.APMPKILL-6097118-0
Obfuscation or payload: unlikely

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