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

Static analysis result for SHA-256 b19e739915fd2fac…

MALICIOUS

Office (OLE) / .DOC

241.5 KB Created: 2020-05-01 14:40:53 Authoring application: Microsoft Excel
MD5: 7209f2d5270cf295d923d72c72379e67 SHA-1: e6387cf423910f8b3839efa1bcbc8475bb6a3b6d SHA-256: b19e739915fd2fac06946fcf236eddc5bfe745e656b26ef754fc47bf080b20c0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro-enabled document. Heuristics indicate the presence of XLM macros that utilize dangerous functions such as ShellExecute and URLDownloadToFile, suggesting a downloader or dropper functionality. The ClamAV detection 'Xls.Dropper.Agent-7733025-0' further supports this. The embedded URLs, although currently classified as benign, are likely used by the macro to fetch and execute a secondary payload. The document body contains numerous strings that appear to be obfuscated or randomized, typical of macro-based malware.

Heuristics 6

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • ClamAV: Xls.Dropper.Agent-7733025-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7733025-0
  • 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 http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • 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
11c27b21faddc5e18dcab634851be04966ccf230069e064364c82ceab87ae8ee		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 37479 bytes

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