Office (OOXML) malware analysis — malicious · 5103226764d85ebb

MALICIOUS

Office (OOXML)

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

MD5: 5af60522e90725cbc781be04a304c532 SHA-1: 1ab7cc58f96595738b1232ae98aa0728b1dc1691 SHA-256: 5103226764d85ebbb4daf886769fe630eebbc7608f0e08fb657a5c2ff074a160

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call is also indicative of malicious activity. The VBA code appears to be obfuscated, but its intent is likely to download and execute a second-stage payload, leveraging the referenced scripting interpreters.

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` `c98e3a8f329a7605d16f1a608bb12e1d400391a7bc514dd3b96b34bc2a6d8f34`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `0ebea589759c6c7b4ba007a3f0dbfbcbd250acfbfc670cdde7db9fff85a2b7db`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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