Emotet — Office (OOXML) / .DOCX malware analysis

Static analysis result for SHA-256 f5ad06ee21525363…

MALICIOUS

Office (OOXML) / .DOCX

136.2 KB Created: 2020-01-24 06:31:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 8e71a37b136340cac7694ec75044d323 SHA-1: f239d56e693a0e7bbcb034ddae03a498d2be7e82 SHA-256: f5ad06ee21525363d7b13ca2d7a969d3c0d939969c120da9bc1feb7c8fdb50d6
220 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is a DOCX document containing VBA macros, specifically a Document_Open macro that uses GetObject. ClamAV detections confirm this is a known Emotet downloader variant. The presence of VBA macros and the Document_Open heuristic strongly suggest the intent is to execute malicious code upon opening, likely to download and run a second-stage payload. The ClamAV detection 'Doc.Downloader.Emotet-7561692-0' is included as a primary IOC.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet-7561692-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7561692-0
  • 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
398e422a1db848f9c23a420430c352af1bd766a5458509b8abb6933edd1e03da		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 15700 bytes
vbaProject_00.bin
f7291e9d9c23592bfd082c8c473dd6dd88f28033651519a6b1cc040fbc878604		 vba-project OOXML VBA project: word/vbaProject.bin 115200 bytes
Detection
ClamAV: Doc.Downloader.Emotet-7561692-0
Obfuscation or payload: unlikely

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