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

Static analysis result for SHA-256 31caa6f66af8581c…

MALICIOUS

Office (OLE) / .XLSX

165.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: cede243ccb2a1fb81284aa31eb65f126 SHA-1: d27cff39992cdbe0402fcfd80f5ad297cd95ec53 SHA-256: 31caa6f66af8581cd7592d9b0e847127bfb2d28575b188ed178b36c3a7435693
60 Risk Score

Malware Insights

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

The file contains an Excel 4.0 macro sheet with an Auto_Open function that utilizes dangerous formula APIs, specifically the RUN function. This indicates the macro is designed to execute arbitrary commands. The embedded URL 'artifkt.com/okmobi/certificate' is highly suspicious and likely serves as the download location for a secondary payload. The document body's repetitive mention of 'DocuSign' suggests a lure to trick users into opening the malicious file.

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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