Office (OOXML) malware analysis — malicious · 35e13bdeeeb29a03

MALICIOUS

Office (OOXML)

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

MD5: 02cc0122e3928b68eb121fe2dc887de5 SHA-1: 516a6571b913901479d9b623a8591b9e4eed7e26 SHA-256: 35e13bdeeeb29a034c163435e5eb0dec5b4ce2cc31d7c33ff06b09951a8e87f1

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of obfuscated VBA code suggest an attempt to execute a malicious payload. The VBA code includes a Base64 decoding function, which is commonly used to obfuscate malicious commands or URLs.

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` `717ff7659b0e0e6070fb3fe9250a1153c8c6f34491a37d57fd38478c60bd20c7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `a8cf91b706b04abf6b4dec09666551bb99cc9c3217f50de152ceb47060e73727`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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