Amphitryon Office (OLE) malware analysis — malicious · 35167e81519fe2ce

MALICIOUS

Office (OLE)

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

MD5: 4b5d739d8911ff786243e9a50601481a SHA-1: 939bc514856900020fb7795238f978b6718f8bbc SHA-256: 35167e81519fe2cee61cea8f8989390c7c4142bb2639f430a40b9645a9eece16

240 Risk Score

Malware Insights

Amphitryon · confidence 95%

MITRE ATT&CK

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

The critical ClamAV detection and high-severity heuristics for VBA macros, including auto-execution via Document_Open and CreateObject calls, strongly indicate malicious intent. The presence of a VBA macro named 'macros.bas' further supports this. The primary function appears to be downloading and executing a second-stage payload, as suggested by the 'Doc.Downloader' classification from ClamAV. The document body content is heavily obfuscated and does not provide clear user-facing text.

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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