Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 61c5a77deb46466a…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ea28d9ca5e15cdb1e5b6e9182047b16e SHA-1: 0ed23787e962783587ecb735e1b9b29cb6592ff1 SHA-256: 61c5a77deb46466a81f114a7378dfde8c51913e8e6810fbed1b3ffbc9abca3dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code itself appears to be heavily obfuscated, but its structure suggests it's designed to decode and execute a PowerShell command. This is a common technique for downloading and executing further malicious stages.

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
31ce392ecf825bf44f69b7ebccd254cf323f03a19aa1f3ffafe6dc64175d613e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
a789f625dc02b5b1ac8267f7acdba4d440590a572fa0db63a6d7e3b1596876b1		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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