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

Static analysis result for SHA-256 fcb42a79105924a4…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 8d790576f557715b043e8d051a7a7e04 SHA-1: f9da054a718bcae186e10e5a0b5e8d6e5274e9a0 SHA-256: fcb42a79105924a4c2db1ff09a8e4769d3412fe648a077529ae4ee35c3473932
102 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet that contains an Auto_Open macro, indicating it will execute automatically when the file is opened. The document body and heuristics suggest a lure to enable macros. The XLM macro sheet contains obfuscated strings that reconstruct the URLs https://escolamundoazul.com.br/ntmQmwXnc6KC/ue.html and https://laresumeservice.com/wp7rTKrY/ue.html, which are likely used to download a second-stage payload.

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://escolamundoazul.com.br/ntmQmwXnc6KC/ue.html
    • https://laresumeservice.com/wp7rTKrY/ue.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e0f9b32b2cf7d5bbad99732afb6eb8bf95619170305ebee6a87504bc690cca2a
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8209 bytes