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

Static analysis result for SHA-256 75a959914236156d…

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 4f4f724737706e77d5110bb4ac7cbdb4 SHA-1: 2780d28bf97a7c221c2f53188f57544b3169128e SHA-256: 75a959914236156d285f392f921cae1f7c78333bdb1cc1bad6a0950a6da1dae6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN heuristic. The document body and heuristics suggest a lure to enable macros, which would trigger the Auto_Open macro. This macro is designed to download and execute a second-stage payload from one of the provided URLs. The reconstructed strings 'CALL', 'RUN', 'Regi', 'ster', 'Server', 'bubl.cmi', 'R', 'EXEC', 'LM', 'JC', 'on', 'CB', 'wnl', 'oadT', 'File', 'LDo', 'o', 'd' are likely part of the macro's execution chain.

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://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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