Emotet — Office (OOXML) / .DOCX malware analysis

Static analysis result for SHA-256 df476578ee7f5bcc…

MALICIOUS

Office (OOXML) / .DOCX

122.4 KB Created: 2020-01-24 06:45:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 0c18a5d0032befae261017c93809f152 SHA-1: c0d7d18e65a688a71ad9af0c7f52e027829f93b9 SHA-256: df476578ee7f5bcc90c4578a7737fffabc637ca583c3ff9d4b79822e68148179
220 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Emotet-7561647-0, indicating it is a downloader associated with the Emotet family. The presence of a Document_Open macro and the extraction of VBA code strongly suggest that the macro is designed to download and execute a secondary payload. The ClamAV detection on an extracted artifact further supports this. The benign URLs present are standard Office XML namespace declarations and do not indicate malicious activity.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet-7561647-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7561647-0
  • 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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.microsoft.com/office/drawing/2015/9/8/chartex
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • 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/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/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
c339511f015fb5661a274ddd7d3547f7a54efad163d945c7b7be7a2783116989		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 15754 bytes
vbaProject_00.bin
d46e82d8e5b1cab209e2b5f966f064de47891bffb761498389f4e4ee6696f05e		 vba-project OOXML VBA project: word/vbaProject.bin 114176 bytes
Detection
ClamAV: Doc.Downloader.Emotet-7561647-0
Obfuscation or payload: unlikely

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