Office (OOXML) malware analysis — malicious · d4f739aea0481465

MALICIOUS

Office (OOXML)

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

MD5: 22e6af165f7d786bf573dbf5c1c182a2 SHA-1: 13c451bb0aeb8710a8749cc95e946ab22c744135 SHA-256: d4f739aea0481465890a6857084a114b0e32fae48e3baefb221ed7d91cee2ce5

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1218.011 System Binary Proxy Execution: Rundll32 T1059.003 Windows Command Shell

The file contains a Workbook_Open macro that references cmd.exe and PowerShell, indicating an attempt to execute commands. The presence of a VBA WMI Win32_Process launcher further suggests the macro is designed to launch external processes. This pattern is commonly used to download and execute a second-stage payload.

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` `549e2703a639b2148e4ca0eb57112ee21a06a5e2ec5a1bf7f684314b1628f39a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35299 bytes
`vbaProject_00.bin` `ae5f86e78544a1ad580d56f6df031e2285b2cd7b8cc256e51caec4b6a5504735`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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