Office (OOXML) malware analysis — malicious · 010d33b20bcc73f2

MALICIOUS

Office (OOXML)

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

MD5: 26bd40d97fdb4fc4d625227e39307805 SHA-1: fc32a97ce2da8721207e8077bdc8902346690843 SHA-256: 010d33b20bcc73f205295f2e2b80018f4c4a0db35f1d659d9f8f326d9a6c847b

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

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's designed to decode and execute a secondary payload, likely via PowerShell. This points to a downloader or droppper 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` `d88336e91cee92959a000bb7fad50134c0c93ea7a6eff472bc8e3b22d76a55b2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `6c7a7d28bc67f4cd2204365204fe074be1801ec5dc6d50e8a7932eca2f308da1`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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