Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d5929a61b9d5a88b…

MALICIOUS

Office (OLE)

133.0 KB Created: 2010-04-28 18:20:00 Authoring application: Microsoft Word 10.1
MD5: 752b0f3d3e05acce4ac6d2015da7b255 SHA-1: 285533cfec9e585c4f27b77d08d4633b6ce826d0 SHA-256: d5929a61b9d5a88b90af26f752a8ed275a2c38746baf91616acd8fe0891b00ab
300 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros, specifically a Document_Open macro that uses CreateObject to execute code. ClamAV detections indicate it is a known trojan. The document body presents plausible academic requirements to mask the malicious intent of the embedded VBA code, which is likely designed to download and execute a second-stage payload.

Heuristics 7

  • 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.
  • 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
d9b96e160d2fe61179057ebb96007cd4ea143b1f23dacc45a5bbb02fc859b67d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3743 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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