Office (OOXML) malware analysis — malicious · c778f655354e7512

MALICIOUS

Office (OOXML)

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

MD5: fc446d863a50f73aadd86c9d535946b1 SHA-1: 030fc936e556b5ff70b0b4dacdd841b5f11bc57f SHA-256: c778f655354e7512a61e529634319e39c22da7a301da285c229478facc8c40f2

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1547.001 Registry Run Keys / Startup Folder

This OOXML document contains a Workbook_Open VBA macro that references PowerShell and cmd.exe. The critical heuristic OLE_VBA_WMI_PROCESS_CREATE indicates the macro uses WMI to launch a process, likely to execute a PowerShell command. This suggests the document is designed to download and execute a secondary payload upon opening.

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` `2906207fa7299ecac438111eb89909414bcd9d7bba017c0699a2d614c955549e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35391 bytes
`vbaProject_00.bin` `7f5eebd078d11163a17f14eb25fd30b83f1597e84a3eda0f3208304e63d8ab2f`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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