Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9d8c8e0666082128…

MALICIOUS

Office (OOXML)

62.5 KB Created: 2021-07-28 13:23:45 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7cfa352e215110a0dacd2775b0585df8 SHA-1: 33d19f179e8c10cf60dee16a17e92ea3c6da5e98 SHA-256: 9d8c8e066608212885610acf9f27fe73ef70f1963dd6bdf8d4e6a24150e43ecc
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The VBA macro within the OOXML document utilizes WScript.Shell and CreateObject to execute commands and download a payload using URLDownloadToFile. The script attempts to read a registry key related to Microsoft Edge, likely to gather information or check for specific conditions before proceeding with the malicious action. The primary function appears to be downloading and executing a second-stage payload.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3b52c8bcab2c4c95c3211787208796d0b91326917fefdd0c580c78efa9c793db		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13028 bytes
vbaProject_00.bin
c10f5d1f0b678879981193a7eb143789756b75652445e3543c7c42d069ea4294		 vba-project OOXML VBA project: xl/vbaProject.bin 45056 bytes

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