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

Static analysis result for SHA-256 eff29f6e669e851b…

MALICIOUS

Office (OLE) / .DOC

60.0 KB Created: 2020-04-19 02:19:00 Authoring application: Microsoft Office Word
MD5: 3c76172956d68a118da09cff4d86cfdd SHA-1: 2d5969e54a1157c1b9e3c09f01029f7e81e5c9ac SHA-256: eff29f6e669e851b8449f4e7dcf2e0ba010e08b3a929c872ee51569b331e67eb
400 Risk Score

Malware Insights

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

The sample contains a critical OLE_VBA_SHELL heuristic firing, indicating the use of the Shell() function within VBA macros. This is further supported by critical OLE_VBA_WSCRIPT firings, confirming the use of WScript.Shell. The presence of a Document_Open macro (OLE_VBA_DOCOPEN) suggests that the malicious code executes automatically upon opening the document. The extracted artifact 'macros.bas' is likely the source of this malicious behavior, which is designed to execute arbitrary code.

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
a3f8c815f1616eed877d72d97db64f0e5f377a1d19e82396a28a280af2496990		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14570 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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