Office (OLE) / .DOCX malware analysis — malicious · fb7120cd04c6c488

MALICIOUS

Office (OLE) / .DOCX

217.4 KB Created: 2020-09-21 20:39:00 Authoring application: Microsoft Office Word

MD5: ef76911bf756fde8a87eb8d621d7dddb SHA-1: 8197f506abd9c17995fda0bd3f50a7fb3efaee4c SHA-256: fb7120cd04c6c488c5a564bb24d9d155389d7cb8a0293e552dd385110bc6ec9f

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a Microsoft Office document containing VBA macros, as indicated by the OLE_VBA_MACROS heuristic. The presence of a Document_Open macro and CreateObject/GetObject calls suggests that the macro is designed to execute automatically upon opening the document. The ClamAV detection and the extracted artifact 'macros.bas' further confirm its malicious nature. The primary function appears to be downloading and executing a second-stage payload, a common technique for malware delivery.

Heuristics 8

ClamAV: Doc.Downloader.Generic-9764666-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-9764666-0
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject 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` `6d2f50f334b8e082813c694e310720d341c184a4af51360bc43b61318b8ab2c5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	19051 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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