Office (OLE) / .DOCX malware analysis — malicious · c353f3d728d9ff05

MALICIOUS

Office (OLE) / .DOCX

240.0 KB Created: 2020-10-29 04:25:00 Authoring application: Microsoft Office Word

MD5: 3718758e200c2888dfc57b92c0eaf534 SHA-1: fd145bf67cf97c604a07c94d3cb2d56e6e1cf30e SHA-256: c353f3d728d9ff052a3ee47d7dd1c5e8bcd8813238a8e20f2f2d0a97fe5bd8e0

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The presence of a critical ClamAV detection for 'Doc.Downloader.Generic' and high-severity heuristics for VBA macros, specifically a Document_Open auto-execution macro and CreateObject calls, strongly indicate a downloader. The Document_Open macro is designed to run automatically upon opening the document, likely to download and execute a second-stage payload. The embedded URL, though benign, is often a placeholder or part of the document's structure rather than the actual payload delivery mechanism in such cases. The obfuscated document body content does not provide further clues to the specific lure.

Heuristics 7

ClamAV: Doc.Downloader.Generic-9785156-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-9785156-0
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` `6946a447d4e81b55f46842d89fcb86ebdb7dd8c4ce560afbdde9533734f99d67`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18622 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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