Office (OOXML) malware analysis — malicious · 5e5f0c8923df3a8c

MALICIOUS

Office (OOXML)

18.9 KB Created: 2021-07-11 09:14:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: 92cb3455cfa00fcf01e36ada20af7e5d SHA-1: 32e40811808b221ef51a43fca0d434bc69fd3198 SHA-256: 5e5f0c8923df3a8c50a2a5213cd57b6d2724ecb8ba803d7696f8031b9c0cda35

242 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

This OOXML document contains a VBA macro with an AutoOpen subroutine, which is a common technique for executing malicious code upon opening. The macro references PowerShell and attempts to execute 'powershell.exe -c calc', indicating an intent to launch a secondary payload. ClamAV detections further confirm its malicious nature as a downloader.

Heuristics 6

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
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.
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — 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` `c26269e98ab850aca20c3560b740c61551ba0cf15548ed6b2b75c37018974078`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2042 bytes
`vbaProject_00.bin` `cc4a6933d25ddc1c068075b69648cf653ab547d054a1613655df74e1d1f0bb80`	vba-project	OOXML VBA project: word/vbaProject.bin	18432 bytes
Detection ClamAV: Doc.Downloader.Pwshell-10001336-0 Obfuscation or payload: unlikely

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