Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 53f3b960019ca2ef…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: eb19c7462467cc020ede16873d751548 SHA-1: 68e5cd6210c3bab7bf47794628b00dd8f00fc372 SHA-256: 53f3b960019ca2ef7792b15b0015aa45e0541cc2e7236bd64c9089ad93f6a94c
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates the presence of PowerShell references within the VBA macros. Additionally, 'OLE_VBA_CMD' and 'OLE_VBA_GETOBJ' suggest the potential for command execution and object manipulation. The VBA code itself appears to be heavily obfuscated, but its structure and the presence of these heuristics strongly suggest it's designed to download and execute a secondary payload, likely via PowerShell.

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
f72d18531874461bc977299fbc83f98d86c9cb0c4709419bdece2574be600d3c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
c6ccf702556d6abf19190e8fddad45ca6a7a798b203a5ba704a7cabdaba46957		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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