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

Static analysis result for SHA-256 c71bd3833fbb10cd…

MALICIOUS

Office (OLE) / .XLSX

91.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 5a75c6184001a6b8785206f1e2121290 SHA-1: b3ec9fbcc5e96c45e74d503210a51a7ee5ce8132 SHA-256: c71bd3833fbb10cd2f845c83a6ed957f3243990de48a74b4d5cf1602303f4bb1
80 Risk Score

Malware Insights

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

The sample contains embedded Excel 4.0 (XLM) macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The SE_ENABLE_LURE heuristic suggests the document prompts the user to enable macros. The embedded URL and the macro sheet's content point to a downloader functionality, likely executing a second-stage payload from the specified URL. The macro sheet's formula APIs, including RUN, are indicative of direct execution of external resources.

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://pg.happyslot88.cc/ds/2202.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
f8e4496a98963101db60727dd23897fc0561510d7b10f276fec256634eb54971		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3016 bytes

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