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

Static analysis result for SHA-256 39e169d7bf49f7f5…

MALICIOUS

Office (OLE) / .XLS

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 566f330ad87be1500a1b2276d82de1d3 SHA-1: 49599986275a933c5e6b12c0f7383757ecf4ccb6 SHA-256: 39e169d7bf49f7f5376f35caedec742ad9bb447aa905b374f20fc7331b9c9e69
160 Risk Score

Malware Insights

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

The file is an Excel 4.0 spreadsheet containing an Auto_Open macro, indicated by critical heuristic firings. This macro likely uses dangerous API functions such as RUN to execute arbitrary code. The presence of two unknown reputation URLs suggests these are used for downloading a secondary payload. The document body also contains these URLs, reinforcing their role in the attack chain.

Heuristics 5

  • 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.
  • XLM Auto_Open with dangerous formula APIs critical 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 https://techserve4u.com/utlqwePl9XKr/alex.html
    • https://evershinesoftware.com/isei5Q7KlsQ5/alex.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
599707db4356dee9b1659b3a18ea6968bd26a6e750ede458308d788c900c5e21		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 5292 bytes

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