Office (OOXML) malware analysis — malicious · baec55290a163250

MALICIOUS

Office (OOXML)

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

MD5: e64cd5e182d1e218d88e82eedaeffe16 SHA-1: 3b404fc470e5da42b0e06c107a8a0194ebd447f7 SHA-256: baec55290a163250b7a9ca32ec942a89bddb12ac4ddcecd096ce2854cb66ed2a

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1218.011 System Binary Proxy Execution: Rundll32 T1071.001 Web Protocols: Web Protocols

The sample is an Excel document containing VBA macros. Critical heuristics indicate the presence of a Workbook_Open macro that references PowerShell and uses WMI to launch processes. This suggests the macro is designed to execute a second-stage payload, likely downloaded from a remote source. The GetObject call and cmd.exe reference further support this malicious intent.

Heuristics 6

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE

VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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` `5f9fdac2a0dac3489b833d8d7fd770e072b9d5e711ebba60dabb21852937ea18`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35583 bytes
`vbaProject_00.bin` `24f74eda3634cde7c18683bee4b236838f0620f0d67867505ad46920b72813b9`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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