Amphitryon Office (OLE) malware analysis — malicious · e243387f9d6d14d0

MALICIOUS

Office (OLE)

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

MD5: 627af658f5c60b13dfdca2b7c6e26cf3 SHA-1: dd10f1a0f9f972c544c796b0b27f2c6aaa005cc3 SHA-256: e243387f9d6d14d042a3822b4b370d2f85701e0d74374cd84b3c08bc5d87aab1

240 Risk Score

Malware Insights

Amphitryon · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains a Document_Open VBA macro that is automatically executed upon opening. This macro utilizes CreateObject, a common technique for executing arbitrary code. ClamAV detection confirms this as Doc.Downloader.Amphitryon-9778217-0, indicating its function as a downloader. The obfuscated document body does not provide further context on the lure, but the presence of a downloader macro strongly suggests it aims to fetch and execute a secondary payload.

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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