Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 79f1aef319a6da48…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3fd40af3522faf5ce8901d3080600802 SHA-1: c55aed1e6fc094bd6d33ce4ebef0cf53fe1145f6 SHA-256: 79f1aef319a6da486f3ebfbe9e7d5b79de1ce91bd5fa563df3f1a50b978a9f61
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it's designed to execute external commands. The presence of obfuscated VBA code, including a Base64 decoding function, strongly implies it's a downloader 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
b8b3e8c826c645349fb198e95b28f99e10e3d7f950a46f4d1514dd5845a3cbdd		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
123d55ebaa74faef5425d2ec3f0b036ff37bc88f7f82676f76e2a6b64047d592		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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