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

Static analysis result for SHA-256 ded682e121849119…

MALICIOUS

Office (OLE) / .XLS

367.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 3144f6be478b02d7758a555ee816e1de SHA-1: 0882ae95939abff82f7b36cbf3d5833b113a8627 SHA-256: ded682e1218491192a7c47a92aa8aa90c1cb2be6f0e1bd3fee0b8a85c4feae0f
102 Risk Score

Malware Insights

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

The presence of Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, indicates an attempt to automatically execute code upon opening the document. The 'Macro/content-enable lure' heuristic confirms that the document likely prompts the user to enable macros. The embedded URLs are suspicious and likely serve as download locations for further malicious payloads. The XLM macros are likely responsible for downloading and executing a second-stage payload from the embedded URLs.

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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
    URL https://mayread.com/aXfFF8qdsV/th.html
    • https://tpcsv.neosj.why3s.tw/XjHoDakG/th.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7758cbebef832a37ce0a327fd7d893202195f03ba9b854edef74b19dbb11678f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8349 bytes

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