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

Static analysis result for SHA-256 a6d83d134a7fdc7d…

MALICIOUS

Office (OLE) / .DOCX

68.5 KB Created: 2021-02-23 20:52:00 Authoring application: Microsoft Office Word
MD5: 40f29a4e81362d9a05688a5eb279bcd6 SHA-1: 98bacf0e21570110c64672dd8f666f6490f28faa SHA-256: a6d83d134a7fdc7dafdddfdb8b5f0e8a41d3396d02915fb0beef7f2d3a7025bc
508 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The sample contains VBA macros that utilize WScript.Shell and CreateObject to execute obfuscated commands. The critical heuristic 'OLE_VBA_OBFUSCATED_SHELL_URL' indicates that these commands construct and likely execute a URL, suggesting the document's purpose is to download and execute a second-stage payload. The presence of 'AutoOpen', 'Workbook_Open', and 'Auto_Open' macros points to an automated execution upon opening the document.

Heuristics 14

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open 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.
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • 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 http://schemas.openxmlformats.org/drawingml/2006/main
    • http://schemas.microsoft.com/developer/msbuild/2003@

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
28c0b6673055f79b9d80337e8fbd38dc5cd69fcc20ce35a21b0d2099be9b8add		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 11562 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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