Office (OOXML) malware analysis — malicious · d4bdf7c861c064b3

MALICIOUS

Office (OOXML)

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

MD5: ac81b395c9d5ca434443536ab04340ef SHA-1: 4d94e69c4ff1795bdcbceed0c481486b85d75227 SHA-256: d4bdf7c861c064b38842dd32328c4c44e94864233622890c43288bc7a848b8f9

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

This Excel document contains a Workbook_Open macro that references PowerShell and cmd.exe. The macro utilizes GetObject and CreateObject to launch processes via WMI (Win32_Process). This indicates the macro is designed to download and execute a second-stage payload, a common technique for initial access and further system compromise.

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` `ba9881fbbc5bad573b76e9e884f6b4bb5529fc3ac1a1e601ed9dfa600a208d46`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36527 bytes
`vbaProject_00.bin` `62d9993f9f9baee6cb04e96054158db94074ffc1d8b297a40d93eb668c3921d5`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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