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

Static analysis result for SHA-256 d88d7121c5380e84…

MALICIOUS

Office (OOXML) / .DOCX

39.1 KB Created: 2020-03-19 19:00:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 6a599fe0aeebe7fc9c8af51efcf97a73 SHA-1: badf5162668f8d3fa6d96c604d4c4148c8efc444 SHA-256: d88d7121c5380e8484773284ae4fbe0989d89fbf05b7cbcd2acc0001a553a85b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1218.011 Signed Binary Proxy Execution: Rundll32 T1059.005 Visual Basic

The sample is a malicious OOXML document containing VBA macros. The presence of a Document_Open macro and a WMI Win32_Process launcher heuristic indicates that the macro is designed to automatically execute upon opening. This macro likely uses WMI to create a new process, which is a common technique for downloading and executing a second-stage payload. The ClamAV detection name 'Doc.Dropper.Agent-7812261-0' further supports this dropper functionality.

Heuristics 6

  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • ClamAV: Doc.Dropper.Agent-7812261-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7812261-0
  • 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
bbd8cabe23e76e8a91f3d2c72391aefe252fcbc50489f91188a9011519a2c8bc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3173 bytes
vbaProject_00.bin
434fa575883c04933ab9ebf1c567ba2e6f6278afa3c706455a6cb6c4bf18046f		 vba-project OOXML VBA project: word/vbaProject.bin 15872 bytes

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