Amphitryon — Office (OLE) malware analysis

Static analysis result for SHA-256 8b14dfc88c1f7dec…

MALICIOUS

Office (OLE)

141.3 KB Created: 2020-10-15 11:18:00 Authoring application: Microsoft Office Word
MD5: 2d1be68dec0eca330eea8caed2255a4c SHA-1: eb95848e014652e952893fdcbd5fea13f116f3fe SHA-256: 8b14dfc88c1f7decae96fd4a01fbf7f68a08a377520966c966f7da397bd18225
240 Risk Score

Malware Insights

Amphitryon · confidence 95%

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

The critical ClamAV heuristic identified the file as 'Doc.Downloader.Amphitryon-9778217-0'. High-severity heuristics confirm the presence of VBA macros, specifically a Document_Open macro that utilizes CreateObject and p-code auto-execution, indicating it's designed to run automatically upon opening. This strongly suggests the macro's purpose is to download and execute a second-stage payload, consistent with the Amphitryon family's known behavior.

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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