Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 53ede915a0010c54…

MALICIOUS

Office (OLE)

113.5 KB Created: 2003-05-16 07:58:00 Authoring application: Microsoft Word 8.0
MD5: 5dff963fe3e18731abfa8b7e291fbad3 SHA-1: faa8fc0eb6922bda7ec1e5e83a5c9b927c7e243e SHA-256: 53ede915a0010c54610aa12b38d88ce7b6084594864ed9e384bde167e98a4602
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1204.002 Malicious File

The sample contains VBA macros, specifically a Document_Open macro that utilizes the Shell() function, indicating an attempt to execute arbitrary code. ClamAV detections 'Doc.Trojan.Marker-31' and 'Doc.Trojan.Eight941-1' further confirm its malicious nature. The document body suggests a lure related to tax amnesty, likely to entice users into enabling macros and triggering the malicious payload.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Marker-31 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-31
  • 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
  • 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
bb88be3f1964c20510f42b887a4a183554574e35a31d42fc5c183af4a537642a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 29304 bytes
Detection
ClamAV: Doc.Trojan.Eight941-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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