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

Static analysis result for SHA-256 c814f842a34f9224…

MALICIOUS

Office (OLE) / .XLS

426.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 06030ca1e47e6d6b3faa2706b224e3a5 SHA-1: 9dd418ccef314e0fb0d2b977b95c6f75546271e0 SHA-256: c814f842a34f9224fbfa5ff0774cb92b4a9d6c6db9109c6855ce83920ea3c4df
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols T1105 Ingress Tool Transfer

The sample contains both XLM and VBA macros, with the Workbook_Open event being present. The presence of the 'Macro/content-enable lure' heuristic indicates the document attempts to trick the user into enabling macros. The XLM macro sheet contains dangerous functions like RUN, and references to ShellExecute and URLDownloadToFile APIs suggest the macro is designed to download and execute a second-stage payload from the provided URL. The URL https://mueblesmaple.com.mx/19.gif is flagged as unknown and is likely the source of the payload.

Heuristics 8

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • XLM Auto_Open with dangerous formula APIs high 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.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://mueblesmaple.com.mx/19.gif�
    • https://mueblesmaple.com.mx/19.gif
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e26e570691e37538cb153a294d4bd7899ebc79f39ec63fd34cf1eae37efa26f6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9455 bytes
macros.bas
8c21c322bb8b23e7dbfa4da0de1c41676162b0810e96582d1365413c12adc768		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 977 bytes

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