Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 866f2686c3885def…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 58188db2ad640e3d3f1c488b58cc6212 SHA-1: 99230e2afe9ba53dc56dd71b038baaf2104dbd86 SHA-256: 866f2686c3885def2a09d56fcc313943869abee3c740e3fd2a302981b3c6e045
160 Risk Score

Malware Insights

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

The 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 downloader or stager for 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
3b5f4642c0d5ccb878680df8640affb49f6d4efae1cd0c1d2218405e6fe3525b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
5c980ee1b7287cea77b273793150c5eb826805da9b3b7453b11f85cdbcd669f4		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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