Office (OOXML) malware analysis — malicious · 0faa8955f53b8208

MALICIOUS

Office (OOXML)

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

MD5: 590d4c6f4fa57b5529fdeded67831486 SHA-1: 0c8b1f60570781c5df88f6557334108272d9b896 SHA-256: 0faa8955f53b8208c9c885d5b4471d358e3d2546c4b2ea224bce61220636ce1b

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 execute further commands. This is consistent with a macro-based downloader attempting to fetch and execute a second-stage payload.

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` `852ad6e803bb8505056fb7e0f1d1a5e6c3c06b63ee0b3dd32a386d33c514d060`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `7683618e58ace48c64819f8b5dca19e5d8c30c70f4190db4c97aa1122bd59a24`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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