Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 1f8cdf0169422fd9…

MALICIOUS

Office (OLE) / .XLSX

43.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-08-31
MD5: 1aba0133d214361329c83e3202c9a04e SHA-1: c22f7067618ed5d1bc8ebf7cf50fb00ca5a36e98 SHA-256: 1f8cdf0169422fd9c7752bc51f43301e87f8cc8f24f9caeff13ff92ddd08217a
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.011 Rundll32 T1059.003 Windows Command Shell

The Workbook_Open macro is configured to execute a command that leverages mshta to download and run a second-stage payload from the embedded URL. The macro attempts to obfuscate the command by concatenating strings to form the final execution command. The presence of the `mshta` reference and the `Workbook_Open` auto-execution heuristic strongly suggest a downloader or initial access payload.

Heuristics 6

  • Reference to mshta.exe high SC_STR_MSHTA
    Reference to mshta.exe
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://www.mediafire.com/file/be9r0dyatydswbe/6.htm/file

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
07a20f018b1ab15fbfad6862f185ddeee4e7e075ec95b63a15cd4790a459678f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2006 bytes

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