Office (OOXML) malware analysis — malicious · 3c9b844486d4920e

MALICIOUS

Office (OOXML)

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

MD5: 212581c811e74808e78aa3cca275d075 SHA-1: e18ceb7a91b4b45d3b5e59eea8bae5ab5241f795 SHA-256: 3c9b844486d4920ed92127c5b32155f629fd1267647fb1e423abd5f13a3b0293

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. This is a common pattern for macro-based malware that downloads and runs additional stages.

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` `fc2afb4a66e30e0035b50ca7295450b4e677f70d536a4da4dc98e92c925d77bf`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `97d712dffb0d1305abd19497d4569fcab2651f3c1cddac241fda64f5c7d61c33`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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