Office (OLE) / .DOCX malware analysis — malicious · c78b6fd735feacf0

MALICIOUS

Office (OLE) / .DOCX

192.9 KB Created: 2020-09-18 12:16:00 Authoring application: Microsoft Office Word

MD5: b708bf85eb0edd23f8f98f302ad88893 SHA-1: c40c2ed8ddee49379af0b48fc23f549b53274b94 SHA-256: c78b6fd735feacf05ab8254985b5a5f154b52b13e5c0033b566d90c3155c915a

240 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a malicious Office document containing a Document_Open VBA macro. This macro utilizes CreateObject and p-code auto-execution, indicating it's designed to run malicious code. The ClamAV detection as 'Doc.Downloader.Generic' further supports this. The primary IOC is the extracted 'macros.bas' file, which contains the VBA code responsible for the malicious activity, likely downloading and executing a second-stage payload.

Heuristics 7

ClamAV: Doc.Downloader.Generic-9763532-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-9763532-0
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` `ba8241e4388725ade491e6e42da3e5f9cf169555b4f6e61ff9f624691af3445f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	20213 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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