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

Static analysis result for SHA-256 cea9aa3538e94241…

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: e846a5e2258f0a6fd04885dae7aba1ee SHA-1: e1f1e4cdec56ac56940a7f85371f0d7e3797f07a SHA-256: cea9aa3538e94241b1d31969f50bfe4dc2b10e7ca471ecfb7104153a24985d14
102 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. The SE_ENABLE_LURE heuristic confirms that the document likely prompts the user to enable macros. The extracted URLs and the presence of XLM macros suggest that the file's primary purpose is to download and execute a second-stage payload from these remote locations. The macro code appears to contain functions for downloading and running files, consistent with a downloader or droppper.

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://thedeformo.com/zrbLAqMKy21Y/lena.html
    • https://faithfulroofingco.com/nmsY1dCNaBRO/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
13ea4a1fd330f9266fa91027043baa61f334e3ac691e10ce14b7c7fee97c551c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8812 bytes

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