Office (OOXML) malware analysis — malicious · ff4ce1f46919bdea

MALICIOUS

Office (OOXML)

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

MD5: b256a05331c5844c7265beb5535bc41b SHA-1: e2d33e5152ac5db4491053dcea390eb8f0134fad SHA-256: ff4ce1f46919bdea31d10f8fff939a958dd533df8b55fddedc9663601924e1fb

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 contains a Workbook_Open macro that references PowerShell and cmd.exe. The critical heuristic 'VBA WMI Win32_Process launcher' indicates that the macro uses WMI to create a process, a common technique for executing arbitrary commands or downloading payloads. The presence of a Base64 decoding function suggests obfuscation of the malicious 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` `c8dd044598a0455554c7c1443ef8ca81c9a5c01558cc383bf21d76c419fcb561`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36173 bytes
`vbaProject_00.bin` `ccea136511c8a759b23b3137fd281638078759b2762d3ace9c216d031c3b3e3d`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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