Office (OOXML) malware analysis — malicious · 051b0dee72e5783d

MALICIOUS

Office (OOXML)

17.5 KB Created: 2021-07-21 20:50:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: c10c253386efe58bb941a3d6df8a4e0f SHA-1: 910d58a8710ae91ba1d4bec6923c3f3691aa67e1 SHA-256: 051b0dee72e5783de1468a9d12f277f2b0e1ae4f6c64ce552e3244f895ce99f0

222 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer T1218.011 System Binary Proxy Execution: Rundll32

The sample contains a VBA macro with an AutoOpen subroutine that executes the 'certutil.exe' LOLBin. This utility is used to download a second-stage executable from the URL 'https://the.earth.li/~sgtatham/putty/latest/w64/putty.exe' and save it as 'c:\tempe\test.exe'. The macro also attempts to create the directory 'c:\tempe'.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin 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
- https://the.earth.li/~sgtatham/putty/latest/w64/putty.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `bf019147f7fa87b5d455f8f750bdfbb512909bfd8e2afd173d40488f89d538fc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	503 bytes
`vbaProject_00.bin` `3de5aa9b9732af6dcea86d1a3a16b32994d0325cbc4a780312e38cd6b205eff3`	vba-project	OOXML VBA project: word/vbaProject.bin	14336 bytes

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