Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c06b333394951a75…

MALICIOUS

Office (OLE)

33.5 KB Created: 2003-01-29 01:22:00 Authoring application: Microsoft Word 9.0
MD5: 13acad873e2e6025490b475ec786fd25 SHA-1: b44df2fd418c68392f4427f9e675a00cbe6cae8e SHA-256: c06b333394951a753ea4e0a23c48236927571ff82a15d6d3f837bee3741615a2
300 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059.001 PowerShell

The file is identified as malicious by ClamAV with multiple signatures, including 'Doc.Trojan.Melissa-7' and 'Doc.Trojan.Melissa-4'. Static analysis reveals the presence of VBA macros, specifically a 'Document_Open' macro that utilizes 'CreateObject'. This indicates the document is designed to automatically execute malicious code when opened, a common technique for delivering secondary payloads. The document body content appears to be legitimate scientific text, suggesting the malicious functionality is entirely contained within the VBA macros.

Heuristics 7

  • ClamAV: Doc.Trojan.Melissa-7 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Melissa-7
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
57adb003894f2bc44fcab6eabd7ff88a7d4a1292b34a9e330bac613ef8757fd2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3880 bytes
Detection
ClamAV: Doc.Trojan.Melissa-4
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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