Malicious Office (OOXML) / .DOCX — malware analysis report

Static analysis result for SHA-256 1a4c0ed12e86a015…

MALICIOUS

Office (OOXML) / .DOCX

18.3 KB Created: 2020-04-03 15:43:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 36bbc888593f9086f4660fa0cd3807d7 SHA-1: 00b61707f9a31182b41d7809344cfbaa17a14c11 SHA-256: 1a4c0ed12e86a0152aedc7516a1a43b2e251826920f0b3f94cefd1ecab83ed5c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is a DOCX file containing a VBA macro. The 'AutoOpen' macro fires upon opening, and the 'URLDownloadToFile' heuristic indicates the script's intent to download a second-stage payload from a remote source. ClamAV detection as 'Doc.Dropper.Agent-9751834-0' further supports its malicious nature as a dropper. No specific family could be identified, but the behavior is consistent with a downloader.

Heuristics 5

  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Dropper.Agent-9751834-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-9751834-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.openxmlformats.org/markup-compatibility/2006
    • 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/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
717c9098a6f3c88cf62bfe518625b5737dcfef18963183e8cf2e0037c79b1431		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3829 bytes
vbaProject_00.bin
89762696162c328b9555077aa9b24bfa0877ad93ac599c36d7a1d03a309b9561		 vba-project OOXML VBA project: word/vbaProject.bin 15360 bytes

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