Amphitryon — Office (OLE) malware analysis

Static analysis result for SHA-256 5cda834a168a9d33…

MALICIOUS

Office (OLE)

141.5 KB Created: 2020-10-15 11:18:00 Authoring application: Microsoft Office Word
MD5: 23ff8b9f92010a28e49b78b49fa4ed29 SHA-1: a49bb655bc505f3e0eeca444634138b8244a63ca SHA-256: 5cda834a168a9d33dd26026046b86bc3a1ec7773fe458eca9a2312c71348d95a
202 Risk Score

Malware Insights

Amphitryon · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains VBA macros, including a Document_Open auto-execution macro, which is a common technique for initiating malicious actions. The macro uses CreateObject to likely download and execute a second-stage payload, as indicated by the ClamAV detection name 'Doc.Downloader.Amphitryon-9778217-0'. The obfuscated nature of the VBA code suggests an attempt to evade detection.

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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