Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 04f761e0cc3d5d00…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 911b6a06007ef71aba960eb4748c94b1 SHA-1: b25f4d48b50387154d526d79129f167376f15667 SHA-256: 04f761e0cc3d5d00f81689f8769d48e140072bd9a889eae70c19873e7eec3514
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro itself appears to be heavily obfuscated, but its presence and the references to external command execution suggest it's designed to download and run a second-stage payload. The specific family is not identifiable from the provided evidence.

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
04f117aff86841a8cadb120086b73af85e8bd882d2a11ddce903e42486d8ad0b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
dd22bd3fc5c6654b1570514406b21a3c2a2101e7bd05252b41826ceabd521c58		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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