Office (OOXML) malware analysis — malicious · 79b0662efd2f24e9

MALICIOUS

Office (OOXML)

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

MD5: c152aad4ac0b7a889daf3a4911896f86 SHA-1: 1e09aa3f9fce51169a604d23967b152fddf69d8e SHA-256: 79b0662efd2f24e9a5c4ab612a69dfb66811ba826f0d3f12f4769547ec6de4ba

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it's designed to execute external commands. The VBA code appears to be a Base64 decoder, likely used to obfuscate a payload that is subsequently executed. No specific IOCs were extracted, but the techniques used point to a downloader or dropper.

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` `9a9d42ef96e0ce3c64bed5a09105a8bf2baac27e2556d2465bbd7fdaf289a160`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `0f506864284f740280d05e00c7ea2b26cd9bbdf390f8eb43d9c69966bc640b4b`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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