Amphitryon — Office (OLE) malware analysis

Static analysis result for SHA-256 004b9a020076d831…

MALICIOUS

Office (OLE)

141.5 KB Created: 2020-10-15 11:18:00 Authoring application: Microsoft Office Word
MD5: 2350cefbcbe2f950455a12681399f657 SHA-1: 32d338cdb4b336156d31bf5e38e55ef54b652449 SHA-256: 004b9a020076d8317b6e57259eff30a147253aafc450379efc2c62a61fcd42ef
202 Risk Score

Malware Insights

Amphitryon · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1105 Ingress Tool Transfer

The file contains VBA macros, including a Document_Open macro that uses CreateObject to execute code. ClamAV identifies this as Doc.Downloader.Amphitryon-9778217-0. The VBA script appears to be designed to download and execute a second-stage payload, indicated by the use of CreateObject and the overall downloader heuristic.

Heuristics 6

  • 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.
  • 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

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