Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4aa4e1380c0c2436…

MALICIOUS

Office (OOXML)

69.6 KB Created: 2021-07-28 13:23:45 UTC Authoring application: Microsoft Excel 16.0300
MD5: 620c24a08164e753d46620c9f5e5af40 SHA-1: 41c3c1c5971bf099635c6181e344a952403ce6e3 SHA-256: 4aa4e1380c0c2436115fef574107c35478a0fea9e54e572cfe901e219e122cbc
250 Risk Score

Malware Insights

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

The sample is an Excel document containing VBA macros that utilize WScript.Shell and URLDownloadToFile to download and execute a payload. The macro attempts to read a registry key related to Microsoft Edge, likely to gather information or check for specific conditions before proceeding. The URLDownloadToFile function is critical, indicating the macro's intent to fetch and run a secondary malicious component.

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
6c8a929c5b0844584188c24807999236885b588a2a04552d06ebe73f281e14b0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13172 bytes
vbaProject_00.bin
bca0a17d3ddfdd53d622c0f43683eebd17c2e37ad0160f986f145dd7c439435d		 vba-project OOXML VBA project: xl/vbaProject.bin 67072 bytes

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