Office (OOXML) malware analysis — malicious · 10a81e505bc4e7b2

MALICIOUS

Office (OOXML)

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

MD5: b7213c220634fcf1ce8908f7adf4ba27 SHA-1: d0ca6c022e08af1751c07a5e60ca1585ba71bc08 SHA-256: 10a81e505bc4e7b2d59593e7a5bad2e4d47fff9d5db13ee1bb3b250cb932ba9f

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 OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest the macro is designed to download and execute a second-stage payload. The specific obfuscation and decoding routine indicate a downloader or droppper functionality.

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` `232ab720ac4dd57ee280cf57e13d836c8229e67327b2588ad19ee9eb1844838d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `fe3073f340578e1b6c8590f1493df38493cbfd3171c3d4085fdfce42ae91dbac`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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