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

Static analysis result for SHA-256 c8bf75c3ab856b28…

MALICIOUS

Office (OLE) / .DOT

61.5 KB Created: 2004-05-26 02:27:00 Authoring application: Microsoft Word 8.0
MD5: 11a71bee63c38c4082cc601ac0e6fb0f SHA-1: d1f817719be9c83812fd161239bbd1c09a1c38d4 SHA-256: c8bf75c3ab856b281ea9ce7850a815b17d53704617c9b5dfec0c7d3ab32c52a6
380 Risk Score

Malware Insights

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

The file is a Microsoft Word template (.DOT) containing VBA macros, as indicated by multiple heuristic firings including 'OLE_VBA_MACROS', 'OLE_VBA_AUTOOPEN', and 'OLE_VBA_PCODE_AUTOEXEC_EXEC'. The presence of 'AutoOpen' and 'Document_Open' macros suggests automatic execution upon file opening. ClamAV detections for 'Win.Trojan.Psycho-3' and 'Doc.Trojan.Melissa-4' confirm its malicious nature. The primary attack pattern involves leveraging these macros to execute malicious code, likely to download and run a secondary payload.

Heuristics 9

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-3
  • 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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
b731439e8c748ba34c904dfd8bb0fbfd55812268fc3c82e3655ab2a2b350a599		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6378 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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