Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 89c014ee75a6631b…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0b2421cf35515a08ad3a65456948a35c SHA-1: 509c0be20fa1bcca87cfad60f66784b3dbc1c1d3 SHA-256: 89c014ee75a6631b59de66adb3b0a4c70d2eb302d3cf632183fa3a2e3c7215fb
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. The VBA code itself appears to be heavily obfuscated, but its structure suggests it is designed to execute commands. This points to a macro-based downloader, likely delivered via spearphishing.

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
42c860feb48c071b401a56b4c950a3857dcc63514546ac20dc26fe972b9fb4c3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
7809967dfaffbd84de0a61075005d6d6682b797734bee0c62523e28685c159a4		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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