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

Static analysis result for SHA-256 2b08e7b15acdf763…

MALICIOUS

Office (OLE) / .XLSX

165.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 8ba19b8ef6dbf8caa528664f1fff8cfd SHA-1: 59cd545ac4a3681e4c1f640a85827d1a57738112 SHA-256: 2b08e7b15acdf76390aa499573b76edbdc69617be61a2fbc0536eb24eada0c79
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell

The file contains Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The presence of the RUN function within the XLM macro suggests it is designed to execute arbitrary commands. The embedded URL 'http://artifkt.com/okmobi/certificate' is highly suspicious and likely serves as a download location for a secondary payload. The document body's mention of 'DocuSign' is a common lure for phishing or malware delivery.

Heuristics 3

  • 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.iec.ch
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
bd262aef1b7122092a6dba2320a0d0734ca374097f0b62238d07ad999ce07250		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1994 bytes

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