Emotet — Office (OOXML) / .DOCX malware analysis

Static analysis result for SHA-256 907a6b87768814cb…

MALICIOUS

Office (OOXML) / .DOCX

133.3 KB Created: 2020-01-23 22:46:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 12b67427b7932e1aa9fee21c636b9163 SHA-1: 2a04f40b11f8f2d9e8e609ba200fb8070d7186f1 SHA-256: 907a6b87768814cbf5b5e0f3f1309013bc451d847c150fe7cd2cc6e99ef0c662
260 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Emotet-7566320-0. Static analysis revealed the presence of VBA macros, specifically a Document_Open macro and a GetObject call, which are common for initiating malicious actions upon document opening. The extracted artifact 'macros.bas' also shows VBA Chr string obfuscation, indicating a downloader functionality. This suggests the document's primary purpose is to execute a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7566320-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7566320-0
  • 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
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
aa8bd6e97f65b483bd135a9f57b0c25b780874624bd6cf90416be7b28931bfc4		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 15182 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 33 Chr/ChrW string-construction calls.
vbaProject_00.bin
42ca3582be09f495dac056c07144d63a44dac0b17dabb643b65571d70753b5cf		 vba-project OOXML VBA project: word/vbaProject.bin 114688 bytes
Detection
ClamAV: Doc.Downloader.Emotet-7566320-0
Obfuscation or payload: unlikely

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