Office (OOXML) malware analysis — malicious · 04a5012118594fb4

MALICIOUS

Office (OOXML)

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

MD5: 8db660f21606af0d265447eae7826a88 SHA-1: 4546bb9f838f3334c1d620ff817e6457706bac12 SHA-256: 04a5012118594fb49004961e66727f930532890703aba04eedcfa69d9742f109

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of VBA macros suggest an attempt to execute malicious code. The VBA code includes a Base64 decoding function, indicating obfuscation, and is likely used to download and execute a second-stage payload.

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` `e867d9457bbf72fb07635e058469fdfcaf68e1eb919c98680f5767fab7ba8d4c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `cb171441ec46d359956f3e365ec1c3d5906012692a7ec1a6191c86a4e3b3d7da`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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