Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ac5a1ccfc2cb2d63…

MALICIOUS

Office (OLE)

154.6 KB Created: 2020-09-15 04:19:00 Authoring application: Microsoft Office Word
MD5: a5590d7b255d3d250c23a3b46293c582 SHA-1: 2deadd8af004281363210abaa936b7d451ba0653 SHA-256: ac5a1ccfc2cb2d63726bcf5e45642e917fe1ed28b105df954b12357292bdcc85
300 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample contains a Document_Open macro that executes obfuscated PowerShell code. This PowerShell code appears to be a stager designed to decode and execute a second-stage payload. The specific PowerShell command was reconstructed from the embedded VBA code. The presence of an obfuscated PowerShell stager indicates a malicious intent to download and run further malicious content.

Heuristics 8

  • Hidden UserForm PowerShell EncodedCommand stager critical OLE_USERFORM_OBFUSCATED_POWERSHELL
    OLE document contains a UTF-16LE form/property string with an obfuscated PowerShell -EncodedCommand payload. The observed macro family reconstructs this hidden string with Split/Join or UserForm property reads and launches it through WMI/COM process creation. This is downloader malware, not an Office CVE exploit.
  • ClamAV: Doc.Malware.Ewlu-9762397-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Ewlu-9762397-0
  • 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
262eaa2cfabe15c408f9ed0f71f3e80b6e1636570aa2563811ecb34f68c15392		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 22860 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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