Office (OOXML) malware analysis — malicious · 107d9f6e5ca9076f

MALICIOUS

Office (OOXML)

15.7 KB Created: 2021-07-26 13:27:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: f72e34179ec016a9d8500f8211a01b9c SHA-1: 047b6a131cc6a0b29054eaf89b3449f5a85deef5 SHA-256: 107d9f6e5ca9076f8d3e9e2be0c80ee25173d7b970833e498098f06ae9a12281

222 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is an OOXML document containing a VBA macro that executes upon opening (AutoOpen). This macro utilizes the Shell() function to launch PowerShell, which is a common technique for downloading and executing further malicious content. The presence of the AutoOpen macro and the direct call to PowerShell indicates a high likelihood of this document serving as a dropper for additional malware.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
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/2020/wordml/sdtdatahash
- 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` `e80e9c7af3824cc1d91fa6453b6f2ff3a41174d2ae63d7210ef31b6085b42140`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	403 bytes
`vbaProject_00.bin` `ff43291415d49cc8e371a61f0ab3644c6d9899ddfe549c625859c821bd8efc27`	vba-project	OOXML VBA project: word/vbaProject.bin	7680 bytes

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