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

Static analysis result for SHA-256 64cfb10817f12511…

MALICIOUS

Office (OLE) / .XLS

318.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b3286a77ef060976143609500b6b9f69 SHA-1: de3bee18d9d17d4b0f1429c5adb920592a41fb3e SHA-256: 64cfb10817f12511be4941e97e4eb396194a0f7ab84e6ae33618e7d10f1f252f
262 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, including an Auto_Open entry that executes dangerous functions. These macros are designed to download a payload from the URL http://titanautomobiles.com/ds/1002.gif. The ClamAV detection 'Doc.Downloader.Docusign0521-9864805-0' further supports its role as a downloader.

Heuristics 6

  • 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.
  • URL reconstructed from XLM cell array (1 URL) critical OLE_XLM_CELL_ARRAY_URL
    Excel 4.0 macro sheet stages its payload URL across the BIFF8 Shared String Table (one quoted-char SST entry concatenated with & at runtime) or across individual numeric cells (one ASCII charcode per cell). The reconstructed URL is invisible to literal-bytes URL extraction because it is never contiguous in the workbook stream. URLs were recovered by walking the BIFF8 record stream and decoding SST entries plus LABELSST/RK/NUMBER cells.
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • 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://titanautomobiles.com/ds/1002.gif
    • http://titanautomobiles.com/ds/1002.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
dee6d7ba75edb008abaea18c282c7fb317ce0edb7a3967c6a9f77260c1932b60		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4271 bytes

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