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

Static analysis result for SHA-256 2fc6de893605e899…

MALICIOUS

Office (OLE) / .XLSX

192.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 21ebe4d705a9872c27659e1a2e8f8358 SHA-1: 3f678b2c909d85d901979baea063ab87e2ee2c7b SHA-256: 2fc6de893605e89988522371f3d3dddfda525c5336ed114424f2eda088b67bd7
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 macro sheet suggests it is designed to execute arbitrary code. The extracted document body contains strings that appear to be related to file paths and URLs, including 'gogorv.net/parseopml/intel.' and 'Frost.bitte', which are likely indicators of compromise for a dropped payload or command and control communication. The macro's intent is to download and execute a second-stage payload.

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
e28030e9d0d14a61d3f2dd5f3a502fe7843136dbc944ec7883cb7b380a59fbd9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 12125 bytes

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