Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a7a2b5263a456e53…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: c577a6c9c9febf0668530946217f5c22 SHA-1: 01930fb6072199776efee0c0f5ad7106684eda71 SHA-256: a7a2b5263a456e53eedfd595b8fca07d1e00e6b17a372ad544edd041e61ce62f
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 cmd.exe and PowerShell. The critical heuristic indicates a PowerShell reference within the VBA, suggesting the macros are designed to execute PowerShell commands. The GetObject call heuristic further supports the possibility of object manipulation for malicious purposes. The primary function of the VBA appears to be obfuscated execution of commands, likely for downloading and running 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
cd4fe95c72332a61d8707ab546be03f0f410500e3c9cf20aa3b7670d9114f306		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
b75e4821a2ee0116cc81c6fa38b533741e9d5f3fe62cf869ebc074d24b89bd08		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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