Office (OLE) / .DOCX malware analysis — malicious · fa680c5aa2331af4

MALICIOUS

Office (OLE) / .DOCX

156.3 KB Created: 2020-09-23 17:49:00 Authoring application: Microsoft Office Word

MD5: b94bbaf1ccf6e6f9d1d876f4b7b5e6bc SHA-1: 34dde6f7b8e2744f9ad4bd0bfdf50a9f25d53b6a SHA-256: fa680c5aa2331af446abfa3ac5bb00034affc9fb4586702ce3b05bd5fbb15578

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The critical ClamAV heuristic firing indicates this file is a downloader. High-severity heuristics confirm the presence of VBA macros, specifically a Document_Open auto-execution macro that uses CreateObject, suggesting it's designed to run malicious code upon opening. The extracted artifact 'macros.bas' further supports the presence of VBA macros. The primary function appears to be downloading and executing a second-stage payload, as indicated by the 'Doc.Downloader' classification.

Heuristics 7

ClamAV: Doc.Downloader.Mryv-9765643-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Mryv-9765643-0
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` `3fdc5dc9fa6dbe05ddbb5394ffbf1a5da353d311eafd75c86ddc522f2b658b58`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	19358 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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