Office (OOXML) malware analysis — malicious · 852311ff396274e6

MALICIOUS

Office (OOXML)

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

MD5: 811a2df2702e31ce923d9be22a37fbc3 SHA-1: abb6c2d2dfeac878fb301f55b465c8bb6528bccd SHA-256: 852311ff396274e6a87a68443952aeff81e965bd1770310bb882075b19851a55

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 OOXML document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The VBA code itself appears to be obfuscated, with a Base64 decoding function present, likely used to hide the actual payload or commands. This points to a macro-based downloader pattern.

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` `56f0d9c2c29898c5de3b83f55e9b0be110659265339e3e258066d0dfff74250a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `e6e92ed1ccc827a4c8739a999e142ddc901132f3047e1b55404ccd541ef932cd`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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