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

Static analysis result for SHA-256 a30c35a3970b0b22…

MALICIOUS

Office (OLE) / .XLSX

644.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-05-29
MD5: 2e74dd646209554ec82305f3e6440156 SHA-1: d605c00ba0c2b167f85934d27138798a9a6fed88 SHA-256: a30c35a3970b0b22a8e5a69605a63de40c3a7045eae385aeb466baea881655ff
62 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The presence of an Excel 4.0 macro sheet (OLE_XLM_AUTOOPEN) indicates malicious intent. The macro code attempts to download a file from the URLs 'covidisaconjob.com.au/P0EpnHrO/key.html' and 'germiterra.com/oNIKvRp9a/key.html', likely to execute a second-stage payload. The extracted strings 'Regi' and 'Server' suggest potential registry manipulation or network communication, though the exact function is obscured.

Heuristics 3

  • Excel 4.0 (XLM) macro sheet uses dangerous capability functions high OLE_XLM_DANGEROUS_FN_STATIC
    Workbook contains an Excel 4.0 macro sheet whose formulas reference two or more dangerous capability functions (e.g. CALL into a Win32 API such as URLDownloadToFile, EXEC to launch a process, REGISTER an external DLL procedure, or FWRITE/FOPEN to drop a file) with an Auto_Open / Auto_Close auto-execution name. This is the canonical XLM downloader/dropper shape and is recovered directly from the BIFF records, so it fires even when the full macro chain cannot be deobfuscated.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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://8QU.GK/HLO Referenced by macro
    • https://covidisaconjob.com.au/P0EpnHrO/key.htmlReferenced by macro
    • https://germiterra.com/oNIKvRp9a/key.htmlReferenced by macro