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

Static analysis result for SHA-256 b184fea6336c3a3d…

MALICIOUS

Office (OLE) / .DOC

564.0 KB Created: 2020-06-23 10:44:00 Authoring application: Microsoft Office Word
MD5: fc94487b88c3f4bbe37d0778dc47bdcf SHA-1: 3e9e7ce66f905002e24047bea634a45519ca7c33 SHA-256: b184fea6336c3a3de2c137014975e1744f18119189b81d5f49466efafbac102d
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The sample contains VBA macros, including an AutoOpen macro, which is a common technique for initial execution. Critical heuristics indicate the use of WScript.Shell and Shell() calls, suggesting the script attempts to execute commands or download additional payloads. The script constructs the URL 'https://marutoba.com/frt.dll' and 'https://caranatrium.com/vertusa.dll' for downloading, and uses 'wscript.shell' to execute them. This points to a macro-based downloader.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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://marutoba.com/frt.dll
    • https://caranatrium.com/vertusa.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
7a5f374eca5a7619e52e2bcf45ad81e89f76665c8afc34b4e30ece640b0b5650		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 15554 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 75 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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