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

Static analysis result for SHA-256 7bfbbd36ce35759c…

MALICIOUS

Office (OLE) / .XLS

114.0 KB Created: 2020-05-28 22:30:54 Authoring application: Microsoft Excel
MD5: 4447104a2a7074e4e5afc75349e59073 SHA-1: 50fbfd1dc5ef1c4fe88cd5badc879ee79fd6e43e SHA-256: 7bfbbd36ce35759c826fbb402a5d5d9831bf3f3a416895f382446c849a9d05f6
120 Risk Score

Malware Insights

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

The presence of Excel 4.0 macros, specifically the Auto_Open function utilizing dangerous formula APIs, strongly indicates malicious intent. The ClamAV detection as 'Xls.Dropper.Agent-7946330-0' further confirms this. The macro likely attempts to download and execute a second-stage payload from a remote source, as suggested by the embedded URL heuristic, although the specific URL could not be fully reconstructed from the document body.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-7946330-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7946330-0
  • 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.
  • 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
fa789b0328b5b124bc18da5c71a89ea165e7c77b2ae4eaab758e3f9438b4017d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 69411 bytes

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