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

Static analysis result for SHA-256 04abe79a8d3d67d1…

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 43c593f5741b5754673814b9f5c08a32 SHA-1: 24c56bcb22c941adb53e116bf7630f9ada9aca6a SHA-256: 04abe79a8d3d67d168e8038c51f0a73ea726d73c10615dd6450a3c575f42da3b
102 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet that contains an Auto_Open macro. This macro is designed to display a lure to the user, instructing them to enable macros. Upon enabling, it proceeds to download and execute a second-stage payload from one of the two provided URLs, likely using rundll32.exe or regsvr32.exe.

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://caiogabriel.com.br/tOKLlSLW/lena.html
    • https://bwctradex.com/BcotoLXTr1y/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
d46ad6b52df62d280ddc3eb28f4fdfc78bc84dc99077b9aa50809affc4be6057		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8812 bytes

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