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

Static analysis result for SHA-256 2265dac0bd9c8330…

MALICIOUS

Office (OLE) / .DOC

1.01 MB Created: 2010-05-03 08:17:00 Authoring application: Microsoft Office Word
MD5: 669d70d4908811524447c15010fae1dd SHA-1: c04380595901bc1008015ef9f24876e4ff43420d SHA-256: 2265dac0bd9c83308d318606fdb87681187d88765be95fb7204651402ce421fd
520 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1059.001 PowerShell

The sample is a malicious OLE document containing VBA macros. Critical heuristics indicate the use of WScript.Shell and cmd.exe, suggesting the macros are intended to execute arbitrary commands. The presence of AutoOpen and Workbook_Open macros, along with a Shell() call, strongly implies that the document is designed to download and execute a second-stage payload upon opening. The ClamAV detection as 'Doc.Downloader.Generic' further supports this assessment.

Heuristics 13

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
25a2bd6e68ac784920b934542cc9d812bcc7a55c4d4d2616d70590b3430c29c4		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 322082 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 37888 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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