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

Static analysis result for SHA-256 379faae06db9367c…

MALICIOUS

Office (OLE) / .DOC

549.5 KB Created: 2020-06-23 10:42:00 Authoring application: Microsoft Office Word
MD5: 238f8d96f61df43a3d43f6f178294f4d SHA-1: 6d771a42bde8f635549732cea875447dd0514655 SHA-256: 379faae06db9367ca73d264029cf3e6b92300ab93b60af0aa15d4cefa3403ddf
288 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 with an AutoOpen function that utilizes Shell() and CreateObject() calls. These macros are designed to obfuscate strings and download a payload from either 'https://caranatrium.com/vertusa.dll' or 'https://marutoba.com/frt.dll' using 'wscript.shell'. The presence of these techniques strongly suggests a downloader or droppper functionality.

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://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
645ced9f2f517367fcf0da58ea4f887c1a47d011383b1e816997583fecf15760		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14976 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 45 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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