Office (OLE) / .DOCX malware analysis — malicious · cb764536b329d21f

MALICIOUS

Office (OLE) / .DOCX

159.8 KB Created: 2020-09-23 21:57:00 Authoring application: Microsoft Office Word

MD5: d276491b285010ee9c418dc5f5f74bde SHA-1: ff7b83845da169745c8d03b18dfd52ea528aed86 SHA-256: cb764536b329d21fa9638d8e1609ad4382e4e4ba44756045a7196c051cd12c78

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Mryv-9765643-0. Static analysis revealed the presence of VBA macros, specifically a Document_Open macro that utilizes CreateObject. This indicates the document is designed to automatically execute malicious code upon opening. The primary function of the detected VBA macro is to download and execute a second-stage payload.

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` `d7dd2a73d7d39dc729b85cfde71706f8b2534ea5cd633d43e9c623fb8097a814`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	20294 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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