Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cc7d4172a6926b22…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f6b10058f65d198fe6397341991bd7d9 SHA-1: 855621447cc50b56b222b9ca87a7c65749a2eb58 SHA-256: cc7d4172a6926b22df0f1323104fb662407ac4ab25b4671c38be28d6fdc65494
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a VBA project indicate macro execution is intended. The VBA code includes a Base64 decoding function, suggesting it's used to obfuscate or decode a payload. The primary goal appears to be executing a secondary payload via scripting interpreters.

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
99b44ec482ac766f01a9b8a125527f431ee18b7a1ff1b4c976035cc5b86eb5fa		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
0c89f96b2fef051a4c37a9d10ef783b57fc371064e6e342d7fa4fe91fa11390b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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