Emotet — Office (OOXML) / .DOCX malware analysis

Static analysis result for SHA-256 329cef98b814d926…

MALICIOUS

Office (OOXML) / .DOCX

134.3 KB Created: 2020-01-22 22:09:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: bb0f91a233cf6e53cfa387ab3ca16737 SHA-1: d5f12bded9d0f0d79b4c8ec21dc71a1e41c6a89d SHA-256: 329cef98b814d926a6f4a2c9635fce3e09e91e9545665914971007acfa9eddbf
220 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with the signature Doc.Downloader.Emotet-7557856-0, indicating it is a downloader. The presence of a Document_Open macro and a GetObject call strongly suggests that the VBA code within the document is designed to execute automatically. This macro likely downloads and executes a secondary payload, consistent with Emotet's typical behavior.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet-7557856-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7557856-0
  • 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
bcf8525c2e46dbc0e62921bdbff8f11d08f3d63f674eabd83dbac42d8bb64219		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 10479 bytes
vbaProject_00.bin
cf16c0cb1a11c0f1ab1699a32975e49f63bcf0950af86863d56591d514a02a5e		 vba-project OOXML VBA project: word/vbaProject.bin 97280 bytes
Detection
ClamAV: Doc.Downloader.Emotet-7557856-0
Obfuscation or payload: unlikely

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