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

Static analysis result for SHA-256 f451db59d5730552…

MALICIOUS

Office (OLE) / .XLSX

37.5 KB Created: 2022-08-31 22:02:43 Authoring application: Microsoft Excel First seen: 2022-09-01
MD5: ee6bd5b5ecdbfe986443a823d6fb771e SHA-1: 4f3fcca29229afe4999c329410b2616f04277ecf SHA-256: f451db59d5730552ffdb65bdcece7d8f664816925024d93e34be21d796ccf800
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1218.005 System Binary Proxy Execution: Mshta

The Workbook_Open macro automatically executes a Shell command that calls mshta.exe with a URL. This indicates an attempt to download and run a second-stage payload from the provided URL. The heuristic firings confirm the use of mshta and a Shell execution of a macro.

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/ctpykmv2qipb41n/11.htm/file

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0a82c176ba127c595824101412a9833ac6f7ad744f518fb0ea022c7b92964ff5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2003 bytes

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