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

Static analysis result for SHA-256 783fc85bebfee64c…

MALICIOUS

Office (OLE) / .DOCX

968.5 KB Created: 2020-09-21 17:10:00 Authoring application: Microsoft Office Word
MD5: 35fb2f1b7db7395a7174d872c4952ac3 SHA-1: 297d434fcb2b26977ba1becfcc90c5a4c7ef8bc2 SHA-256: 783fc85bebfee64c89af88faa3a05f1d3e8919b29b706cd126e2467261bf27d0
400 Risk Score

Malware Insights

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

The sample contains VBA macros with Auto_Close and Shell() calls, indicative of malicious intent. The heuristics strongly suggest the use of WScript.Shell and CreateObject for executing code. The presence of 'macros.bas' as an extracted artifact further supports this. The primary function appears to be downloading and executing a secondary payload, as suggested by the 'Doc.Dropper' ClamAV signature.

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: Doc.Dropper.Sdrop-9769002-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Sdrop-9769002-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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
4c9238efcbd310b4639ed140e6ecc8e3a2cfd64a7d56323e021e6c1a7fd6b0a7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 34613 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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