Office (OOXML) / .DOC malware analysis — malicious · 5ede0a1b7ba81ec8

MALICIOUS

Office (OOXML) / .DOC

115.2 KB Created: 2020-07-17 10:53:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: aeaf6adfc0632d5be24a247e0f97ebdf SHA-1: 26e1e8e4c92e8f5c2ab4042ab93a8b59ededc8a5 SHA-256: 5ede0a1b7ba81ec8a85085a2db694f68f9dd9b07311e239f27101c46ecf003bd

222 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious Office document containing VBA macros. The 'autoopen' macro executes a function that decodes a string and then uses URLDownloadToFile to download a second-stage payload to 'TR.tmp'. This indicates an attempt to download and execute further malware. The ClamAV detection also confirms its malicious nature.

Heuristics 6

URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
ClamAV: Doc.Downloader.GreenBox5-9139204-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.GreenBox5-9139204-0
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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` `732cfb0a8dbce707aaff57dc00031f932f0c94387083f116ae8b0ec4be7d4ba0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3150 bytes
`vbaProject_00.bin` `739684eb9f8e625b6df7d715210a992bc5922d9a985df8484fe7e51edcb6917d`	vba-project	OOXML VBA project: word/vbaProject.bin	25600 bytes

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