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

Static analysis result for SHA-256 b2a3e7ff64f5872c…

MALICIOUS

Office (OLE) / .XLS

95.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 7f37c44dbc7be8d313fb6645e6f1c2fe SHA-1: 53b88bb6891fe2763c2b0d300603d4cb9d4f944e SHA-256: b2a3e7ff64f5872c08c1f71e6dd3ee0b9a51c439725277669fa1eddde9658457
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The file contains VBA macros, specifically a Workbook_Open macro, which is designed to execute automatically. The script utilizes WScript.Shell and the Shell() function, indicating an intent to run external commands or download and execute a second-stage payload. While no specific URLs or hashes were extracted, the heavy reliance on WScript.Shell and auto-execution heuristics points to a downloader or dropper functionality.

Heuristics 9

  • 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
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a79bbd3fda43e7e7d3ec1229445a0f2acd6f5689338e2024897fe6248d1b67a3		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 16125 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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