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

Static analysis result for SHA-256 22575337422dc887…

MALICIOUS

Office (OLE) / .DOCX

51.5 KB Created: 2005-02-16 14:34:00 Authoring application: Microsoft Word 8.0
MD5: c5d9811938042242fb6f110523ee3dd2 SHA-1: 6814450d8cf2926b20a5ba6052b34621e6d08bec SHA-256: 22575337422dc8870f218a63803a3f3b923a081d84c42d5d9d42d6ffd26de449
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell T1547.001 Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder

The sample contains VBA macros with an AutoOpen subroutine that executes a batch file named 'Boum.bat' located in 'C:\DOS\'. This batch file is designed to format the C drive using the 'Format C: /u /Autotest' command. The VBA script also displays a countdown timer and a fake virus warning to the user before executing the destructive payload. The presence of AutoOpen and Shell() calls, along with the destructive nature of the script, strongly indicates a malicious intent.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.AutoD-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.AutoD-1
  • 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
  • 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
01f681418561bec91ab0b2e45de56c0c8c60bc275505388de807981be3bd0311		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 23600 bytes
Detection
ClamAV: Doc.Trojan.AutoD-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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