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

Static analysis result for SHA-256 15a1068a6a8bff66…

MALICIOUS

Office (OLE) / .XLS

158.5 KB Created: 2021-11-16 23:08:37 Authoring application: Microsoft Excel
MD5: bdc24968728c3797ba208b115608d63b SHA-1: 4f16af0da84d34e2b1b9cc8da892493896718d20 SHA-256: 15a1068a6a8bff6617630b4e1f0c0f23ebd270d2a052263eb8bf4353656c3ad2
82 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros, specifically an Auto_Open macro, which is designed to execute a command. This command attempts to download a file from the URL http://87.251.85.101/balzak/balzak.html, likely serving as a second-stage payload. The use of obfuscated commands within the macro indicates a malicious intent to bypass detection.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • 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
d850f7a43da6e41e5c1b945537fd4d97757e0ab67bf22a5e1f5a8496772cbe97		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 793 bytes

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