Emotet — Office (OOXML) / .DOCX malware analysis

Static analysis result for SHA-256 de127bb190f1b8b1…

MALICIOUS

Office (OOXML) / .DOCX

51.7 KB Created: 2020-01-30 13:48:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: a138a550ae7d8393246f4f70c77f7686 SHA-1: b89b7e8698560ee8643f1afd940bca0cf2e832e1 SHA-256: de127bb190f1b8b140a703ca5142794b02fd5b7e9cebcc1f2e7518c90c8d3054
220 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Emotet-7571984-0. The presence of a Document_Open macro and a GetObject call strongly suggests that the macro is designed to execute automatically upon opening the document. This macro likely downloads and executes a secondary payload, a common tactic for Emotet. The SHA256 hash is included as a primary IOC.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet-7571984-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7571984-0
  • 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
3b4dcf5df75be4ffd457ee9c49f9854b64d336a1402703b0b8f9221f440d188a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5618 bytes
vbaProject_00.bin
bb2e0960da857b32b4044ab0f53b24274e50d0ebfacccc766e52a479f4229219		 vba-project OOXML VBA project: word/vbaProject.bin 43520 bytes
Detection
ClamAV: Doc.Downloader.Emotet-7571984-0
Obfuscation or payload: unlikely

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