Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d891041360f4015c…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: db88a9806327631ccd05395c15918bd4 SHA-1: f209c7f915a24471f1f7d59132434e630c47181d SHA-256: d891041360f4015ccc94b2cff49547eb62855140f692424c89d701dadad9bc69
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro itself appears to be obfuscated, but its presence and the references to external command execution suggest it's designed to download and run a secondary payload. The specific obfuscation technique used in the VBA code is a form of Base64 decoding.

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
d6fe41f51b7cf7445d22c45567742843d43e30bf4dd5848d472a836faa412f69		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
c96f1f7c3f809c06c5edc02c364fb00d4939bec4834100b277484068dbd39a81		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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