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

Static analysis result for SHA-256 41506003fd52c539…

MALICIOUS

Office (OLE) / .DOC

563.0 KB Created: 2020-06-23 10:45:00 Authoring application: Microsoft Office Word
MD5: 92e808445a2d37acd033de975e434418 SHA-1: 87e80794479a953fb5e2b95a06acc2eb6d77f476 SHA-256: 41506003fd52c539b8d5833d2a507ab24cd9c1903d0311ac06e14f6309ca5a1c
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample contains VBA macros, including an AutoOpen macro, that utilize the Shell() function and CreateObject to execute commands. The script attempts to download a DLL from 'https://caranatrium.com/vertusa.dll' or 'https://marutoba.com/frt.dll' using 'wscript.shell'. This indicates a downloader functionality, aiming to fetch and execute a second-stage payload.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Dropper.Agent-8176891-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8176891-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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 https://caranatrium.com/vertusa.dll
    • https://marutoba.com/frt.dll
    • http://www.w3.org/1999/XSL/Transform
    • http://schemas.openxmlformats.org/drawingml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliography
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
505d0a6fd460b8a2cd6205ccd06666d0a68bec3b57e88dc92177af7203311dff		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 15784 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 71 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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