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

Static analysis result for SHA-256 69fc38b246bdcb72…

MALICIOUS

Office (OLE) / .XLSX

89.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 51ba9390e30aa7739516e817f10812cc SHA-1: 4a0f56958a45748fc8e87ae88338985a218cf2d9 SHA-256: 69fc38b246bdcb72d8bedf6990f9096b524fd508cd0fd02766c3429021d60868
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating it is designed to execute automatically upon opening. The presence of a macro-enable lure and a dangerous formula API (RUN) strongly suggests a malicious intent to download and execute a second-stage payload from the embedded URL. The macro attempts to use 'rundll32' to execute a file from a local path, likely downloaded from the provided URL.

Heuristics 5

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://admin.ecrtechnologyperu.com/ds/1902.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
bbd33517393cbce6ee65ec4f25759bc584a492e71d319574161752e5ce8a6fab		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2686 bytes

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