Office (OOXML) malware analysis — malicious · d62459ce753dfa5d

MALICIOUS

Office (OOXML)

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

MD5: e15a47a2764c298575adbed811efe3dd SHA-1: 721dffdcd0d22ab15d64463d7a661e8c86707e4a SHA-256: d62459ce753dfa5d49ab8dbaf53fdc7365ba8902c538246ddee36fef6704ae21

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 OOXML document contains a Workbook_Open VBA macro that references PowerShell and cmd.exe. The macro utilizes GetObject and WMI to launch a process, indicating an attempt to execute a secondary payload. The presence of these elements strongly suggests a downloader or dropper functionality.

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` `a1d6a7d5f80fb73671153815df78c49b8ae8b3eb2b98417e0903c2b484695b3c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35915 bytes
`vbaProject_00.bin` `60af42fa8fe6e397f64bebbc86b756affef4bf875aacea2ef20b7a71534fc692`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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