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

Static analysis result for SHA-256 0284d79fb76eb5b4…

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 590e2c6376bffc0a8a4df9de43ce4827 SHA-1: 83478144196750c44896b0326e854922c419e13e SHA-256: 0284d79fb76eb5b4ba805c628c01626689b75241771f46333c7f890d3a3f6a41
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1105 Ingress Tool Transfer

The presence of an Excel 4.0 macro sheet with an Auto_Open entry, combined with heuristics indicating a macro-enable lure, strongly suggests malicious intent. The macro appears to be designed to download and execute a second-stage payload from one of the provided URLs, such as 'https://thedeformo.com/zrbLAqMKy21Y/lena.html'. The macro's functionality includes calls to 'LOADTFILE', 'RUN', and 'Regi', 'ster', indicating it attempts to download and execute a file.

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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