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

Static analysis result for SHA-256 0ca75f8f78281915…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 778d5653e32b4c7416d98790c850d1f7 SHA-1: f277ab3e2695248a1cdcad3c264174f8344c6e78 SHA-256: 0ca75f8f782819155932339b3bc6846a99bda12cb07d0617321cbf47d12b65ce
242 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros that are configured to automatically execute upon opening. These macros utilize dangerous functions such as RUN and CALL, and construct strings that appear to be part of a download and execution chain. Specifically, the macros attempt to call external URLs like 'https://5gict.com/ds/261120.gif' to fetch and execute a second-stage payload. The presence of ShellExecute API references and the ClamAV detection further support its malicious nature as a downloader.

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://5gict.com/ds/261120.gif
    • https://5gict.com/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
a172d04deb874bfc5428cadf9fe508e67386f425fa8a97e12d80c959c827f2d9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6674 bytes

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