Office (OOXML) malware analysis — malicious · a28bb1fe8e50edae

MALICIOUS

Office (OOXML)

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

MD5: c58ff897483b0fa07bc7d5c17cf0c863 SHA-1: 6340e3835fb1faa5e20c9103e1707818794788c7 SHA-256: a28bb1fe8e50edae3d3c5471d345ea7d0829ff55003018a74b419ccda69cd5ed

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. The VBA code itself appears to be heavily obfuscated, but its structure suggests it is designed to decode and execute a payload. This is a common pattern for macro-based malware, often delivered via spearphishing attachments.

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` `5c43f731ea3f348b6d3b335faa89db2539a67574a07a8aa6f5bbcf1a2485b31e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `4a24184dd87c9304151d462b244887e99feee1d3387d709699e4ad9414a80b9a`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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