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

Static analysis result for SHA-256 829de4a9781e20f9…

MALICIOUS

Office (OLE) / .XLS

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a7cfa0eb31a94f6ca793d35ef5e5b5df SHA-1: 215f774bbc2dc880e8d5191e7311ec6c195f973e SHA-256: 829de4a9781e20f9c1865bdde03238d107bfd5d6120cc8fd59151ce7a28c636d
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The Excel file contains Excel 4.0 macros, specifically an Auto_Open routine, which is designed to execute automatically when the workbook is opened. This routine is configured to present a lure, instructing the user to enable content, a common tactic to bypass security measures. The macros also reference external URLs, indicating an intent to download and execute a secondary payload. The presence of dangerous formula APIs and the Auto_Open defined name further support this malicious intent.

Heuristics 6

  • XLM Auto_Open workbook with payload URL or enable-content lure critical OLE_XLM_AUTOOPEN_PAYLOAD_LURE
    Workbook contains an Excel 4.0 macro sheet with Auto_Open / Auto_Close and also exposes a payload URL or enable-content lure in the OLE bytes. This combination is a high-confidence XLM downloader/social-engineering pattern even when formula recovery cannot decode the full macro chain.
  • 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.
  • XLM Auto_Open with dangerous formula APIs critical 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 https://allproac.com/u8AwHMG0OM/alex.html
    • https://karnafulimarine.com/lmjhxNSMbf/alex.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7b20680a5c8f61ed44dce4de0580631b9188f0dd2fb85ee91819a05bfb80a422		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 5292 bytes

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