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

Static analysis result for SHA-256 7d66370f91b0574e…

MALICIOUS

Office (OOXML) / .DOCX

22.9 KB Created: 2021-03-15 13:26:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 6d3b90b7d6da1af9cd77b1a348c3e1a7 SHA-1: dbdbf38329c85f84974f529bcc0fbe964162c6b1 SHA-256: 7d66370f91b0574e202760391402acaa5216f3f2fe7748573e43cdb93f933e4c
182 Risk Score

Malware Insights

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

The sample is a DOCX file containing VBA macros, specifically a Document_Open macro, which is a common technique for executing malicious code automatically when the document is opened. The ClamAV heuristic firings confirm this is a known malicious macro. The VBA code attempts to overwrite itself and execute, indicating it's designed to download and run a secondary 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 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

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
40218ad973d5d545bc7876310dc2728ca5426dcd178acd1f4a86f8a986ac1fa1		 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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