Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8b66fdbef8d2545e…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1fb40b6bbe99cac3b55613cded8bbce0 SHA-1: e1acfbe7b1bcb70b5d242211848e2ebdb8743669 SHA-256: 8b66fdbef8d2545e9f0d7b900ee169e950c908d3149464771e50adbba7abe338
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The file is an Office 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 presence of a large VBA macro suggests it's likely responsible for downloading and executing a second-stage payload. No specific family could be identified.

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
4e68b1b6456b5f64ea11f1bcc082f7f351305475127596ac322feeda437618e4		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
7f01ba2cae7cb707d1df8d3b754e9c8d3b8a73558b1e1ad794733555a7592159		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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