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

Static analysis result for SHA-256 251310c8c94d2a3d…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 23f7143961206318e3f5376b660ab88f SHA-1: 1caa1b4e6dd16f3d61d28c058b70ff1f07b67548 SHA-256: 251310c8c94d2a3d56995552da38b08aba3e871981d11041c903093f80095058
102 Risk Score

Malware Insights

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

The sample contains Excel 4.0 (XLM) macros, including an Auto_Open entry, which is a strong indicator of malicious intent. The presence of a 'Macro/content-enable lure' heuristic and embedded URLs suggests the document is designed to prompt the user to enable macros, leading to the execution of the XLM macros. These macros likely download and execute a second-stage payload from the provided URLs: https://signifysystem.com/ceg7AX7oN0o/ue.html and https://fcventasyservicios.cl/k60jvjcT/ue.html.

Heuristics 4

  • 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.
  • 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://signifysystem.com/ceg7AX7oN0o/ue.html
    • https://fcventasyservicios.cl/k60jvjcT/ue.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c7d4d2bead8580d5104e88300cefa6eb3ebffd421d1191db8449676bfb792ff2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8209 bytes

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