Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5fc92b2e1b7337b5…

MALICIOUS

Office (OOXML)

69.6 KB Created: 2021-07-28 13:23:45 UTC Authoring application: Microsoft Excel 16.0300
MD5: 41f6f5e9d6ececc036b322f7cafc5314 SHA-1: 162b340d3192ca73c2409bbd8039899acd839bda SHA-256: 5fc92b2e1b7337b54687d3c50fc64c4d59f54174d49080db44ca7ded099b0b43
250 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of VBA macros that utilize WScript.Shell and CreateObject, specifically calling URLDownloadToFile to fetch a payload from a provided URL. The script's intent is to download and execute a second-stage payload, likely leveraging the URL found in the embedded artifacts. This points to a macro-based downloader.

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://github.com/florentbr/SeleniumBasic/releases/download/v2.0.9.0/SeleniumBasic-2.0.9.0.*
    • https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
28f59fe31d20366f5669d47de65de32089b41d0a0aa492dbff397fb0cf09c8c9		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 14017 bytes
vbaProject_00.bin
135b881b63990364e1284990b47ba62bf9621e5e49ee5eaae99973e73333ba91		 vba-project OOXML VBA project: xl/vbaProject.bin 67072 bytes

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