Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 624fa4511b165348…

MALICIOUS

Office (OOXML)

67.7 KB Created: 2021-07-28 13:23:45 UTC Authoring application: Microsoft Excel 16.0300
MD5: fc41ebeb2c35bdae0bdab1869eaf1398 SHA-1: 3116cc1b0f79883e68051e3d00c4eb2ea9a86181 SHA-256: 624fa4511b165348c57de01d8ffd941118cbe6badf293c8a8f586c238adeb0f6
250 Risk Score

Malware Insights

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

The sample contains VBA macros that utilize WScript.Shell to read registry keys and URLDownloadToFile to download a payload from a URL. The script attempts to retrieve an Edge browser version from the registry and display it, likely as a lure or to check for specific conditions before executing its malicious payload. The presence of URLDownloadToFile and WScript.Shell usage strongly indicates an intent to download and execute 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
364b99effa8dfceb303d88ae2528f9026e7d205e95afe0485fc200ef9ac6c2ce		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13184 bytes
vbaProject_00.bin
7fdb3c9c8a80ea5fa0c14c6e8c7879208e3b11e6e28fd04964b5bc6e11465028		 vba-project OOXML VBA project: xl/vbaProject.bin 60416 bytes

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