Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 13533da9cc3288e9…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 6010e84947b5de2340db8e4d2f84d724 SHA-1: 11214e50d3d80c3db00be7e78bf0370d8f56495c SHA-256: 13533da9cc3288e9ba59f5c8c55dd468748f8369fa25494e3bc5134cc9b76cc1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This Excel document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating a likely attempt to obfuscate and download 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.

FilenameKindSourceSize
macros.bas
4fabb8b56bcc3f6833926963726464d3b8619e7503a06470c50a11cfd0b78fa6		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
534a9e87ddec53d5a62466b8bbf53c5fd15c512f2b688a7dd20060ec55bde8a4		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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