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

Static analysis result for SHA-256 0d5e447f9978b1d0…

MALICIOUS

Office (OLE) / .XLS

332.0 KB
MD5: a3d118c664adcdd03b3af961d4036766 SHA-1: 5aa1619930774643382d689bd3f07302de94ed91 SHA-256: 0d5e447f9978b1d0918bd06ad888f008089f383ecf34c9d523d45f9e2dcca0e1
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, including an Auto_Open macro that utilizes dangerous functions like RUN and CALL. The CALL function appears to construct a command to execute a downloaded payload from the embedded URL 'https://dtmh.gr/ds/231120.gif'. This indicates the file's primary purpose is to act as a downloader for further malicious activity.

Heuristics 6

  • 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.
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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.
  • 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://dtmh.gr/ds/231120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c8d4504c98e732b3946f99214663fda76453297a5fc2e4e085c3ff1af974258c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6293 bytes

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