Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ba7b7de14a0c671e…

MALICIOUS

Office (OLE)

46.0 KB Created: 2005-08-25 03:47:00 Authoring application: Microsoft Word 10.0
MD5: 1767fa184cc53384b4c053a2b6c33b9c SHA-1: 07e9b59c3d9e8a2fdf4b3d4681b2af8376877ff5 SHA-256: ba7b7de14a0c671e82bbd64c8a2ba444678f097268165516cffae0d05e420673
300 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing VBA macros, specifically a Document_Open macro that uses CreateObject to execute code. ClamAV detections indicate this is a known malicious document type, likely related to the Melissa family. The macros are designed to run automatically when the document is opened, indicating a payload delivery mechanism.

Heuristics 7

  • ClamAV: Doc.Trojan.Melissa-23 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Melissa-23
  • 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
1a58e515a4675ec6b0d8c5666e158b98a782e6a2fcc36cd2405847933fac9d9f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3421 bytes
Detection
ClamAV: Doc.Trojan.Melissa-15
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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