Amphitryon — Office (OLE) malware analysis

Static analysis result for SHA-256 81fcbb632ef9fc5a…

MALICIOUS

Office (OLE)

140.2 KB Created: 2020-10-15 11:18:00 Authoring application: Microsoft Office Word
MD5: 4d7a25d3840eb00cd2be86f9e312f816 SHA-1: 7b3c7259ee22a22c0a3e01ac4492e752a139e47d SHA-256: 81fcbb632ef9fc5a4bbcbd81603127c1a0238b784579f62735dad19fda06ab77
240 Risk Score

Malware Insights

Amphitryon · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV as Doc.Downloader.Amphitryon-9778217-0. Static analysis revealed a Document_Open VBA macro that uses CreateObject, indicating it's designed to execute code automatically when the document is opened. This macro likely functions as a downloader for a second-stage payload. The presence of VBA macros and the auto-execution behavior are strong indicators of this attack pattern.

Heuristics 7

  • ClamAV: Doc.Downloader.Amphitryon-9778217-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Amphitryon-9778217-0
  • 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
ceb2cd1feb993343b43c1a562f1511ffad0916ca06ac60b4283e0a65886cd4c5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10625 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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