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

Static analysis result for SHA-256 587711eb000b4a61…

MALICIOUS

Office (OLE) / .XLS

110.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 2040f321bb7c9cc33da1c7e42d8f54c3 SHA-1: 2e60b3934a02fb46a97348c93bd3fae9adb2a7f6 SHA-256: 587711eb000b4a618dacb771bf45d583b3844c537916c5a486fcc5cc3f81d669
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218 System Binary Proxy Execution T1059.003 Windows Command Shell

The sample contains XLM macros, including a call to `RUN=0` which is indicative of executing commands. The presence of `SE_LOLBIN_RUN_COMMAND` and the `rundll32.exe,DllRegisterServer` instruction in the document body strongly suggest the execution of a malicious payload. The embedded URL `http://mempresariales.com/ds/061220.gif` is likely the source of this payload, which is then executed by the macro.

Heuristics 5

  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • 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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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 http://mempresariales.com/ds/061220.gif�
    • http://mempresariales.com/ds/061220.gif
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
700d528fd593784369da26777fb00cef6c34efb4cbfae84251e80320e3e8a815		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1943 bytes

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