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

Static analysis result for SHA-256 b5a172ebbef81c36…

MALICIOUS

Office (OLE) / .DOC

418.5 KB Created: 2020-06-29 11:35:00 Authoring application: Microsoft Office Word
MD5: 8c2e2039c0f81b75eb635f8f4f74f3f5 SHA-1: 4b81a6803e86bede82f734dccfbfb7aeedd0f611 SHA-256: b5a172ebbef81c36154d3529678ae6a522bd1fd4c9c896d252caa5f81beee1cc
288 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols T1105 Ingress Tool Transfer

The sample contains VBA macros, including an AutoOpen function, which is a common delivery mechanism for malicious documents. The embedded JavaScript is obfuscated but reconstructs the string "wscript.shell" and references URLs such as "https://bentorium.com/vapirum409.dll" and "https://bentorium.com/coclew.dll". This indicates the script is likely intended to download and execute a second-stage payload from these URLs, aligning with a typical downloader or droppper attack pattern.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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://bentorium.com/vapirum409.dll
    • https://bentorium.com/coclew.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
d8e8d12406888a757d7ffe253ca558d07d4a02fce147aed8851e93720a7ade84		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10045 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 33 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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