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

Static analysis result for SHA-256 4559945017fcab5a…

MALICIOUS

Office (OLE) / .DOC

60.0 KB Created: 2020-04-19 02:19:00 Authoring application: Microsoft Office Word
MD5: f14da4c185e9fdfb9e213c953b6d2b18 SHA-1: 11bd3812ee586eb2d3e95a8e5422c00428ebb0fe SHA-256: 4559945017fcab5a492d4e7e5ea25d80ef8c27af4bcb72cb98b1e5e76077d21a
400 Risk Score

Malware Insights

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

The sample is a malicious OLE document containing VBA macros. The 'Document_Open' macro is automatically executed upon opening the document, which in turn uses WScript.Shell to execute a command. This command likely downloads and executes a second-stage payload, as indicated by the 'OLE_VBA_SHELL' and 'OLE_VBA_WSCRIPT' heuristic firings. The presence of 'macros.bas' further confirms the macro-based nature of the attack.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Macro.Obfuscation-9804250-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Macro.Obfuscation-9804250-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4bbfb8af3a10f4208816873601e1f74c10f4d704aa272e0026a2d30bc8d8cb19		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14400 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 69 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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