Office (OOXML) malware analysis — malicious · cf20145a82b14e74

MALICIOUS

Office (OOXML)

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

MD5: b7516451d38d5c1a79b09ce647d4d542 SHA-1: 361a887ab9c07ca08960bf6bf1abf8aefc94169b SHA-256: cf20145a82b14e748c3c11abdeba371636d0a1cf32c1ba5a1eebf151cbed7219

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it's designed to execute external commands. The VBA code itself appears to be heavily obfuscated, but its presence and the associated heuristics strongly suggest a macro-based downloader. The lack of specific URLs or clear command strings limits the IOCs, but the overall pattern is consistent with a malicious document.

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` `d50121ebcbc4ad53d24a56b6e50df4637798844b332fd1e96924a2c1f25ec4ac`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `83268ba75b030b812bf2f0950fab9db8ee996ba4cc2b1325f1007ac0a8626f02`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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