Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4943047eb09aaa38…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 659862adc09d78e9896548048f2da86c SHA-1: e124386603181c8246ede74856a4495203294a44 SHA-256: 4943047eb09aaa381c82b432493ee04b709da1de567c13eb352fadc16c7c7aa3
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The VBA code itself appears to be heavily obfuscated, making it difficult to determine the exact payload, but the overall pattern points to a macro-based downloader. The GetObject call further supports the execution of external code.

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
af5a2b052586f6b77f64120309a0c0eb278ccf943e757866d5b21bb57b1bce11		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
04522508e4f5a950d70ea1667333b7c024ceb493ec6648f01559af42d44017df		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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