Office (OOXML) / .DOCX malware analysis — malicious · aad50defad8ece75

MALICIOUS

Office (OOXML) / .DOCX

123.5 KB Created: 2020-01-30 11:22:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: 68ff6d27a0db36afbcb61970349238f0 SHA-1: 0b40ebd65ab28cb965ebc87d18655ddca612e49c SHA-256: aad50defad8ece75bf9f59dd7c07d495ef015fc68c40ef208e81a1c50a8d0c42

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The presence of a Document_Open macro and GetObject call, combined with ClamAV detections for 'Doc.Downloader.Mrwx-7570416-0', strongly indicates a macro-based downloader. The VBA macros likely execute code to fetch and run a secondary payload from a remote source. The SHA256 hash is included as a primary indicator.

Heuristics 6

ClamAV: Doc.Downloader.Mrwx-7570416-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Mrwx-7570416-0
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` `3e00c7c58b0bef0db091eaa9612f6f818e8a76280ea31c6bb9cf3be71721dc73`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5666 bytes
`vbaProject_00.bin` `d52658d788db5c6e2034181a5c0472547a50b75b9df5556dd872103e6802f03a`	vba-project	OOXML VBA project: word/vbaProject.bin	42496 bytes
Detection ClamAV: Doc.Downloader.Mrwx-7570416-0 Obfuscation or payload: unlikely

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