Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d41850ac72928fc6…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1b4485508b26f0d1f876e8b445958324 SHA-1: 902c62aff00e28fdb6f59609f0b04d517dbfa32c SHA-256: d41850ac72928fc675eb1d6fa9db77a568954e3385acc8342a5904a0fa12547c
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The presence of a GetObject call further suggests dynamic execution. The VBA code itself appears to be heavily obfuscated Base64 decoding, likely intended to hide the actual payload or download URL. This indicates a macro-based downloader designed to execute 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
16e8e29d8d754b21fc681da95db3f9e1cdc26e5a3445b95c3a2e2cc74acddef4		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
da849c802213d145742104225eabb32cf39178da588971425ffe2b12fcad9845		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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