Win.Trojan.Leonor-2 — Office (OLE) malware analysis

Static analysis result for SHA-256 f5d51185effab81a…

MALICIOUS

Office (OLE)

20.5 KB Created: 1993-09-28 15:08:00 Authoring application: Microsoft Word for Windows 95 First seen: 2012-06-14
MD5: 5b8960a2015f728c4b728062e623863d SHA-1: 3aec403580b2a5ac8606d9fa0010658a09c4ac93 SHA-256: f5d51185effab81a9e56d3a20072fd184c756d18319c8827baaa439b85c99de7
220 Risk Score

Malware Insights

Win.Trojan.Leonor-2 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature Win.Trojan.Leonor-2. Static analysis revealed a legacy WordBasic AutoOpen macro, indicating an attempt to execute code automatically when the document is opened. The embedded artifact and macro names suggest a trojan likely designed to download or execute further payloads, potentially related to the 'Leonor' macro.

Heuristics 4

  • ClamAV: Win.Trojan.Leonor-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Leonor-2
  • Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE
    A CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • CFB header with no readable streams medium OLE_PARSE_EMPTY_STREAMS
    The file begins with a valid OLE2/CFB header but exposes no directory streams. A non-empty compound document with an unreadable directory is anomalous — it is seen with truncated/corrupt files and, more importantly, with content deliberately shifted off byte boundaries to defeat parsers while the host application still recovers the object.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_office_off00002100.ole embedded-office Embedded OLE/CFB Office body inside ole container at offset 0x2100 12544 bytes
SHA-256: 77b70ff39b41e7f4a2da3bbfae05e1d7b39e3343db4dff18878897b47ae9c1bb
Detection
ClamAV: Win.Trojan.Leonor-2
Obfuscation or payload: unlikely

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