Office (OOXML) malware analysis — malicious · 7d4477852d05a799

MALICIOUS

Office (OOXML)

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

MD5: 7ac63a170db227246976b20ee8662339 SHA-1: 1415d94674da9651c28cb4608b63d5081536917e SHA-256: 7d4477852d05a7991a064f15c78b2d9aaece61d2b04c2b3a6f1ed1be302129bf

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic 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 macro itself appears to be a Base64 decoder, suggesting it is used to obfuscate a payload that is likely executed via PowerShell. This pattern is commonly used to download and execute further malicious content.

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` `b454ea0164a989ab170946dcde0c72c0675b69a87afc7f726b80e81762137710`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `94e758d8303c6f764f0e4ff83a4d84e3ff7e746ae7163305fc6cb31fd0257167`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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