Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0d1b41ed61154bca…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0cdb72d4b22ed5a3ce796570052e6d45 SHA-1: dca1d800f92d4fc62c9e6098b25cb1e73df6d2e6 SHA-256: 0d1b41ed61154bcaa5be86ede047a7ec57bba39c6563e0b783821f293f1e2698
160 Risk Score

Malware Insights

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

The file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The presence of a GetObject call further suggests dynamic execution of code. The obfuscated nature of the VBA code and the use of these execution methods strongly imply a downloader or droppper functionality, aiming to fetch and run a second-stage payload.

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
3359c214d498bc978c9362d4645b19b088f88397d2e9d6dcccaef2bed4e6bd7b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
4ac6b806b96c6b7595405b2c7d0aea048f2e62dbd0273d089f1307d82c7319d7		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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