Office (OOXML) malware analysis — malicious · ea27d6492ebff055

MALICIOUS

Office (OOXML)

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

MD5: b47b38d31e0450234e9474f451f6f8ca SHA-1: f5b88c3c60956e08798437ae385bd746e9bb6668 SHA-256: ea27d6492ebff0550330f7da7b2fb198573635f02a45a2d950997c64737800cc

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 cmd.exe and PowerShell. The GetObject call and the presence of VBA macros strongly suggest an attempt to execute arbitrary code. The VBA code itself appears to be heavily obfuscated, but the references to cmd.exe and PowerShell indicate a likely multi-stage attack where a second-stage payload is downloaded and executed.

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` `08cff8fd24f88dc569cb17279d6a1c8f1489d44cbb7c2909bb149295fd62b0ea`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `8d3eb502bdaf2a83e079c995d7046967600da1d5c6152b22c22b3664a9f12c73`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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