Office (OOXML) / .DOCX malware analysis — malicious · b15f6192914fbb60

MALICIOUS

Office (OOXML) / .DOCX

123.2 KB Created: 2020-01-30 19:13:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: c53b5ad2c85d64fed33e38e554dadcb1 SHA-1: 4831499338b26d124032926b1cfe380a12569f63 SHA-256: b15f6192914fbb60d450e78b6fb07dd78f4574c7e1afb31236e924e846243cef

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is a DOCX document containing VBA macros, specifically a Document_Open macro that utilizes GetObject. ClamAV detections indicate this is a downloader. The presence of VBA macros and the Document_Open heuristic strongly suggest the intent is to execute malicious code upon opening the document, likely downloading a second-stage payload.

Heuristics 6

ClamAV: Doc.Downloader.Chartres-7570796-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Chartres-7570796-0
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
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.

Filename	Kind	Source	Size
`macros.bas` `bf77f07695fceef47f0766c82da53fd0e1da07076467e2f469c08f93ec045482`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5439 bytes
`vbaProject_00.bin` `5954fe5845715b651d00cd71058f612897631f9ed117eacece3fa1a539b22f39`	vba-project	OOXML VBA project: word/vbaProject.bin	41472 bytes
Detection ClamAV: Doc.Downloader.Chartres-7570796-0 Obfuscation or payload: unlikely

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