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

Static analysis result for SHA-256 5249e43b972f40a7…

MALICIOUS

Office (OLE) / .XLS

995.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 81d961fd1967f6ded990fefbd7366ad0 SHA-1: bf7168f9f7bfa16c1d98c72c44e2c0782dd66896 SHA-256: 5249e43b972f40a78393ddc43b32e444c5ff30bd068078e63112a9da85abfcd5
80 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open entry, which is a strong indicator of malicious intent. The macro sheet appears to be designed to mimic a DocuSign interface, likely to trick the user into downloading a payload. The reconstructed URL 'http://metalin-cr.com/appdata/datafile.php' and the path '\AppData\Roaming\files.rere' suggest the macro's purpose is to download and execute a second-stage payload.

Heuristics 2

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
01c7c852b63d9288d4e3ac02bb53ed22af3a3fc08a0c68e78820a9c1115bae8a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3084 bytes

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