Office (OOXML) malware analysis — malicious · 836371d91cd47dad

MALICIOUS

Office (OOXML)

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

MD5: 619eaa799c311335f57ac9db798dfc55 SHA-1: f7ecf62754140218ee9924501d65e2f1df2c7e33 SHA-256: 836371d91cd47dadac68bfac12d227a04637e4098f2f96f28c00d0dd966cfd3a

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

This OOXML document contains a Workbook_Open VBA macro that references PowerShell and cmd.exe. The macro also uses WMI to launch a process, indicating it's designed to execute arbitrary commands. The presence of a Workbook_Open macro and the use of PowerShell strongly suggest this file is a malicious attachment intended to download and execute a secondary 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` `26eb309f04ff4b52f979bc3ca2e733cc5c9fc9630adf8dc3a544c8b90b8ab961`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35354 bytes
`vbaProject_00.bin` `46c062bdfa5984090d41102898cb636d3cc235dfeb40693d04e73cc2315714fb`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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