Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 33de365d07fb9bf2…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 329061b0f145ec6b92e32036cc26f29f SHA-1: a70ebac7dd40641719823adcc973bb81d376e5ed SHA-256: 33de365d07fb9bf285ddf2a87c037e655c7d1f3e0d8bdfac18b799540888a2c3
160 Risk Score

Malware Insights

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

The file is an Excel document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The VBA code itself appears to be heavily obfuscated, making it difficult to determine the exact payload, but the overall pattern points to a macro-based downloader. The GetObject call further supports the execution of external code.

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
891c1e7ca071d7351e660469706a0151088cc980c3080c66801abe256c6e1926		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
d7f99ce0e83d58f0eb3d71ff500bd4df68197b0539690beb3a689d4e631d8c97		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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