Office (OOXML) malware analysis — malicious · d4764166ea5c255b

MALICIOUS

Office (OOXML)

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

MD5: ece9c51e846464dcd2f119fc4e2c6ff2 SHA-1: 26057bcfb1f5655b4b91fbacd32483d5d95e5cab SHA-256: d4764166ea5c255b134e48d59b5f9c4b488f8c0d67efee505965b74992d999ff

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code itself appears to be heavily obfuscated, but its likely purpose is to execute further commands, potentially downloading and running a second-stage payload. The Base64 decoding function suggests encoded commands or payloads are being processed.

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` `a97c920091869603e0d47b9c0d4bbe4783e69ed5d0e392098af4d99bd41ca491`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `3fcaa0db90f54d413c11595b0de42aa345ee6ca7008df59ce756a2154924c163`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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