Emotet — Office (OOXML) / .DOCX malware analysis

Static analysis result for SHA-256 f351e1457d7673a6…

MALICIOUS

Office (OOXML) / .DOCX

134.1 KB Created: 2020-01-23 14:08:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: b239675c09b6095367ded732a1259e93 SHA-1: 15162071221210983a8bcd5fcf61524edd551f80 SHA-256: f351e1457d7673a650544a0130b943fc10aba1ee461e398687a2d85fabb79129
260 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-7560776-0, indicating it is a known Emotet downloader. The presence of a Document_Open macro and GetObject calls strongly suggests that the VBA code within the document is designed to execute automatically. This macro likely attempts to download and execute a secondary payload, a common tactic for Emotet. The extracted artifact 'macros.bas' also shows signs of VBA obfuscation, further supporting this analysis.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7560776-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7560776-0
  • 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
244204135a32546b864ea2b981b6fa2196918a05ef3d20a971f97231aeedefbf		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 16888 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 33 Chr/ChrW string-construction calls.
vbaProject_00.bin
9397f5821208c92c7284058d31e0216d7b35f9f8744cd1941dec7d257c82c15e		 vba-project OOXML VBA project: word/vbaProject.bin 114176 bytes
Detection
ClamAV: Doc.Downloader.Emotet-7560776-0
Obfuscation or payload: unlikely

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