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

Static analysis result for SHA-256 38d7d6d412a6a726…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 9c09b22ea96ae31114f6537622889e7d SHA-1: 1eb994c3296ecd73c1ead0ae573c8179df330999 SHA-256: 38d7d6d412a6a7269c39cafecfd89817467fd7a48e09488462644539cefec8c1
160 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro sheet (XLM) that contains an Auto_Open macro. This macro uses dangerous functions like RUN, indicating it likely executes arbitrary code. The presence of ShellExecute API calls further supports this. The embedded URL is likely used to download a second-stage payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' suggests a downloader family.

Heuristics 5

  • 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
  • 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.
  • 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://ump.edu.pe/ds/261120.gif
    • https://ump.edu.pe/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
56d07016068e454a1af96b6cee33e5364bc7ae97582ff73833a2c41ba0035917		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6675 bytes

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