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

Static analysis result for SHA-256 f509ba1502515533…

MALICIOUS

Office (OLE) / .XLS

89.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 5cc3140989b4a5046c90605c6688b2da SHA-1: 57b43b8e9195ab82d2d6f4496fb16e9256ece5aa SHA-256: f509ba15025155337b26dcae09ddc3825ef66c85158be27fc72a231fe4e0a930
80 Risk Score

Malware Insights

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

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that uses dangerous functions, specifically the RUN function, indicating it attempts to execute arbitrary code. The document body and heuristics suggest a lure to enable macros, a common technique for malware droppers. The embedded URL likely serves as the download location for a second-stage payload.

Heuristics 4

  • XLM Auto_Open with dangerous formula APIs high 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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