Office (OOXML) malware analysis — malicious · d948d1a84cdc2a82

MALICIOUS

Office (OOXML)

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

MD5: 1523d7b4137e8de0d937942439b4cba2 SHA-1: c410e660243c6c42c27f862b02f13c66a113c45c SHA-256: d948d1a84cdc2a82432785057e6caec0bf4fd26f07717a07568e0a40d3d78620

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code itself appears to be heavily obfuscated, but its structure suggests it is designed to decode and execute commands, likely to download and run a second-stage payload. The presence of these elements strongly suggests a malicious macro downloader.

Heuristics 4

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
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` `82393bc5d6b58be352aed1f86961cc9326dcb1ad844b4115da523f38bee5a351`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `5b4e0060dba6e4c7eefda5a9f9f26f4b114b9a4c834033766ceacda5bc88a4d0`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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