Amphitryon Office (OLE) malware analysis — malicious · d78facd499d94ec1

MALICIOUS

Office (OLE)

140.5 KB Created: 2020-10-15 11:18:00 Authoring application: Microsoft Office Word

MD5: a8956f6dec0398c057c70211b6e1ae04 SHA-1: 9af75686314a56a4bcfa657ee33a32a3f78aba2d SHA-256: d78facd499d94ec13b381733eee00bd566ddd24ee98d4a1a7316fcaaa126e043

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 with the signature Doc.Downloader.Amphitryon-9778217-0. Static analysis reveals the presence of VBA macros, specifically a Document_Open macro that utilizes CreateObject. This indicates the macro is designed to execute automatically when the document is opened, a common technique for downloading and executing further malicious content. The obfuscated document body content does not provide further insight into the specific lure, but the macro execution is the primary indicator of malicious intent.

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.

Filename	Kind	Source	Size
`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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