Office (OLE) / .DOCX malware analysis — malicious · 9a89421741b56db1

MALICIOUS

Office (OLE) / .DOCX

195.6 KB Created: 2020-09-18 21:15:00 Authoring application: Microsoft Office Word

MD5: a358018c8bc52596376fd9e7fd29c87a SHA-1: 50ccd24a1ef9e0a2e991d85da672a5db1ae21ffb SHA-256: 9a89421741b56db1e2d97d925176d40fae890abdefd3e136a24afb0589d4371e

240 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a Microsoft Office document containing a large VBA macro. Heuristics indicate the presence of a Document_Open macro that uses CreateObject and p-code auto-execution, strongly suggesting it's designed to run malicious code upon opening. The ClamAV detection as 'Doc.Downloader.Generic' further supports this. The extracted artifact 'macros.bas' is the likely source of this malicious behavior, probably downloading and executing a second-stage payload. No specific family could be identified.

Heuristics 7

ClamAV: Doc.Downloader.Generic-9763611-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-9763611-0
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` `27aa07f405fa9b3280133cc26ba8fa4c11df7235c7ef1a37f33a0286291c2144`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	19156 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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