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

Static analysis result for SHA-256 977f45adb4b6da56…

MALICIOUS

Office (OLE) / .DOC

412.0 KB Created: 2020-06-29 11:37:00 Authoring application: Microsoft Office Word
MD5: 3e8d24031c03ce997bf99ef24f89fcad SHA-1: 7e74cbfce730b8963c82ed72ebcb5bf34829156d SHA-256: 977f45adb4b6da562e30e2bdb2acf421f67088453d233fe987ee751888b9a311
228 Risk Score

Malware Insights

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

The sample contains VBA macros, including an AutoOpen macro, which is a common delivery mechanism for malicious documents. The script utilizes CreateObject to instantiate 'wscript.shell' and attempts to download a DLL from 'https://bentorium.com/vapirum409.dll' or 'https://bentorium.com/coclew.dll'. This indicates the document's primary purpose is to act as a downloader for further malicious payloads.

Heuristics 8

  • 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
ff81974ccba241bec8e38c8e835ca91438a3c25ffd917c3fddbf1b6f5a376e83		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9833 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 38 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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