Office (OOXML) malware analysis — malicious · f8ade048cfcc3f92

MALICIOUS

Office (OOXML)

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

MD5: f61d909614908f402bc9a414f3ac4286 SHA-1: ba6c0185d9ea484341645700b831ca3bd9778a02 SHA-256: f8ade048cfcc3f925c648d5a48d728a7ee5b0171d4ca14e3298bb50f348322a2

260 Risk Score

Malware Insights

MITRE ATT&CK

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

This OOXML document contains VBA macros that are triggered by the Workbook_Open event. The macros reference PowerShell and cmd.exe, and use WMI to launch processes, indicating an intent to download and execute a secondary payload. The presence of a Base64 decoding function suggests 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` `4e18de0c31cf80313a1391d4d91d4a2fec8076448904b1cdaa2a0ece311e8bba`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35319 bytes
`vbaProject_00.bin` `e9e6c66efdb95b41487aaba3cfa74c6c3db2f311315866010f80618aa13d8ba9`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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