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

Static analysis result for SHA-256 a50a9733f36b1f44…

MALICIOUS

Office (OLE) / .DOC

547.0 KB Created: 2020-06-09 09:51:00 Authoring application: Microsoft Office Word
MD5: 01167d35be6ad434d8057eda78f711c2 SHA-1: 6cbb6c1833a62891bdcf3cf4e261faf5f9d9f8c1 SHA-256: a50a9733f36b1f444efc7336f490d49199f61f34643f9125908bd47b6fcd173b
348 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 WScript.Shell to execute commands. The script reconstructs the URL 'https://triaruum.com/xaswindows.dll' and appears to download and execute a DLL. This is supported by the critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristic firings.

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://triaruum.com/xaswindows.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
7fbf898cbee43004f3aee9e2d9e4973c402d803da952c458c5fee0bf964ff45d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 20823 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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