Office (OOXML) malware analysis — malicious · 8a6fd62158242b5e

MALICIOUS

Office (OOXML)

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

MD5: eed3da1e4b3cea0185abf0df87dc435f SHA-1: 0b267f7939dca507e2b00443c05024d69cb700aa SHA-256: 8a6fd62158242b5e7f6dadc99954c90c436db8f678b906197a1a68e0b1197f77

260 Risk Score

Malware Insights

MITRE ATT&CK

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 processes, indicating an attempt to execute arbitrary code. The presence of a Workbook_Open macro and the use of PowerShell strongly suggest this file is a malicious document designed to download and execute a second-stage payload upon opening.

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` `657185c8d247fa9b47cb2636dc2016e7d148ef6e490a71d54438f0b21cbd3216`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35796 bytes
`vbaProject_00.bin` `dc9f3be1bcae1598e52f1233e65f191dbe9c26104ac42a196754b1fce6f34f25`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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