Office (OOXML) malware analysis — malicious · adc10d92edea9689

MALICIOUS

Office (OOXML)

42.2 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: eb227c275488aa49bb1c6139993c6825 SHA-1: 78f6f98d9427a3a12d460b52524ec366dd7bbd88 SHA-256: adc10d92edea9689aeff2d681a74913b6725559ad2d72f64e3de33b7ffd55a54

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Office document containing VBA macros. The Workbook_Open macro is present and references PowerShell and cmd.exe. Crucially, it uses WMI to launch a process, indicating an attempt to execute a secondary payload. The VBA code also contains Base64 decoding logic, suggesting obfuscation of malicious commands or URLs.

Heuristics 6

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE

VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `478e8f172b5e8933bd04524171f0fc602f240c924cd361c48570fda701e67c82`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36448 bytes
`vbaProject_00.bin` `52b2c282b711a312873fdd8c87a1e3f9202e5e67a109360bae6d1d3f892d3ed3`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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