Office (OOXML) malware analysis — malicious · 80f470d4a4928039

MALICIOUS

Office (OOXML)

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

MD5: a491f6d19d0c5150dfe298ba128fe71b SHA-1: ba90615a6c91bd7a5549aaaa9eabe874c78680aa SHA-256: 80f470d4a492803978b4d058cdf1cfa4b60cf039cc53567880777996973bd0dd

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro appears to be a Base64 decoder, likely intended to obfuscate and execute a second-stage payload. This suggests a downloader or dropper functionality.

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` `95a952f7f1dd5c832fbf8d0bfb239869453cc34456c51ab738645d9d2a711a36`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `3243ec5af1a041ba74fa331bd85c4d944ea64e5a805c1c1f763c8398a70e8c59`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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