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

Static analysis result for SHA-256 faf41e34773e4d2f…

MALICIOUS

Office (OLE) / .DOC

605.5 KB Created: 2020-06-29 12:00:00 Authoring application: Microsoft Office Word
MD5: 2873741693304eccf1b7a1f05eaa75ee SHA-1: beac0f1af9eb799eb90258a27a9665b17b1f65ea SHA-256: faf41e34773e4d2fe05ae82dcab66a47bfdd6708b4906599488485a9ffbefc4f
288 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains VBA macros with an AutoOpen function that utilizes Shell() and CreateObject() calls. The script attempts to download a payload from 'https://bentorium.com/coclew.dll' and 'https://bentorium.com/vapirum409.dll' using WScript.Shell. This indicates a downloader functionality aiming to fetch and execute further malicious content.

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/coclew.dll
    • https://bentorium.com/vapirum409.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
f3f59992b9839db3d54a40980324bedbfa5662fbb63acf7c0c19ae44f5008e98		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9318 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 59 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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