Office (OOXML) malware analysis — malicious · 18cc5a0fcb605afc

MALICIOUS

Office (OOXML)

75.6 KB Created: 2021-07-13 12:00:46 UTC Authoring application: Microsoft Excel 16.0300

MD5: 8f97039e747287df3456569668760fa5 SHA-1: 9a41a0f25c147851eb28bbdc96e5d4d5755d27d5 SHA-256: 18cc5a0fcb605afc0109ae4f9420070ea980ca18954c5514afb46ed150e314a2

242 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an Office document containing a Workbook_Open VBA macro. This macro references PowerShell and cmd.exe, and uses CreateObject, indicating it's designed to execute arbitrary code. The VBA code itself is a known implementation of RunPE, suggesting the intent is to download and execute a second-stage payload. The presence of URLs pointing to GitHub repositories related to RunPE and malware analysis further supports this.

Heuristics 7

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
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 https://github.com/itm4n/VBA-RunPE
- https://github.com/hasherezade/
- https://www.codestack.net/visual-basic/algorithms/data/encoding/base64/
- https://www.codestack.net/license/
- https://www.codestack.net/visual-basic/algorithms/data/encoding/base64/�
- https://www.nirsoft.net/kernel_struct/vista/IMAGE_DOS_HEADER.html
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms680305(v=vs.85).aspx
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms680313(v=vs.85).aspx
- https://msdn.microsoft.com/en-us/library/windows/desktop/ms680339(v=vs.85).aspx
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms680336(v=vs.85).aspx
- https://www.nirsoft.net/kernel_struct/vista/IMAGE_SECTION_HEADER.html
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms684873(v=vs.85).aspx
- https://msdn.microsoft.com/en-us/library/windows/desktop/ms686331(v=vs.85).aspx
- https://www.nirsoft.net/kernel_struct/vista/FLOATING_SAVE_AREA.html
- https://msdn.microsoft.com/en-us/library/windows/desktop/ms679284(v=vs.85).aspx
- https://www.nirsoft.net/kernel_struct/vista/IMAGE_DOS_HEADER.html�

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `cc93f0f852c5572f9ff9ca9737b9502a034d56fa5acb53a338171dad9644bb6c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	55069 bytes
`vbaProject_00.bin` `cee9395631d397173c3d0217e48773255d1fafda799695e38bea3f5f7d0eeb49`	vba-project	OOXML VBA project: xl/vbaProject.bin	148992 bytes

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