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

Static analysis result for SHA-256 f869ddc48d85d150…

MALICIOUS

Office (OLE) / .XLSX

86.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 73e4f79f460988813f494accd4d28415 SHA-1: 7778e631a31a94e4109db61de4cbebbc20de62f7 SHA-256: f869ddc48d85d1506f92225f59a239d42b4befe190b6de278e8cd0c9381ec8c1
80 Risk Score

Malware Insights

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

The file contains embedded XLM macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The SE_ENABLE_LURE heuristic suggests the document attempts to trick the user into enabling these macros. The embedded URL is likely used by the macro to download a second-stage payload. The macro sheet contains a call to RUN, which is a dangerous API.

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 http://rlyrt26rnxw02vqijgs.com/fera/frid.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7c4e6e8611159b572e384e022cb7e9edbaa0a964189883c047d79a06d41903f6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2390 bytes

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