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

Static analysis result for SHA-256 819273b637aa3d7d…

MALICIOUS

Office (OLE) / .DOC

190.1 KB Created: 2019-12-06 19:43:00 Authoring application: Microsoft Office Word
MD5: c3d6e9cced9f71d25309a2240eb8b182 SHA-1: b13414f3430f8e606afe178bf1a65319741b95d9 SHA-256: 819273b637aa3d7db7f8e436d37513443d2eb96b7d449bf11cdd3f1fc221d2b6
300 Risk Score

Malware Insights

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

The sample is a malicious OLE document containing VBA macros. The 'Document_Open' macro is configured to auto-execute and uses 'CreateObject' to launch a 'Win32_Process' via WMI. This indicates the macro is designed to download and execute a second-stage payload. ClamAV detected this as 'Doc.Downloader.Generic-7434732-0'.

Heuristics 8

  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • ClamAV: Doc.Downloader.Generic-7434732-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7434732-0
  • 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
  • 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
f120237d86de2f89e9c189c8d932aac9350b9d4b0e18a4c79bd04b5be8fcca8b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7893 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 16 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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