Emotet — Office (OOXML) / .DOCX malware analysis

Static analysis result for SHA-256 76d41fdb3ffffb21…

MALICIOUS

Office (OOXML) / .DOCX

135.2 KB Created: 2020-01-23 21:44:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: aeec6502b2f385c44172ae8836358407 SHA-1: 1dc0ac6d1a807b27110bdff794afb91e2568c730 SHA-256: 76d41fdb3ffffb2102ad5d613e50d50df316675e40ee451a26f7a5a71d8de79c
260 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is detected as Emotet by ClamAV, and static analysis reveals the presence of VBA macros within the OOXML document. Specifically, a Document_Open macro is present, which is a common technique for Emotet to initiate execution. The macros likely download and execute a second-stage payload, as indicated by the 'Doc.Dropper.Emotet-7560803-0' detection name. The extracted artifact 'macros.bas' also shows VBA Chr string obfuscation, further supporting the malicious nature of the script.

Heuristics 7

  • ClamAV: Doc.Dropper.Emotet-7560803-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Emotet-7560803-0
  • 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
0120ae0f258457865b39b390b760a85e9a3fcd8556a30967d32478b5b53d07b2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 15189 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 33 Chr/ChrW string-construction calls.
vbaProject_00.bin
add701379f68c819ffa7572fb19620c027af876d22e1aac5f3fd85594c5ca43c		 vba-project OOXML VBA project: word/vbaProject.bin 116224 bytes
Detection
ClamAV: Doc.Dropper.Emotet-7560803-0
Obfuscation or payload: unlikely

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