Office (OLE) / .DOCX malware analysis — malicious · 8245f1e6e844bf57

MALICIOUS

Office (OLE) / .DOCX

173.0 KB Created: 2020-09-17 10:17:00 Authoring application: Microsoft Office Word

MD5: da90673f3e0a86e372e0d35e703b6ef3 SHA-1: 2a933b7117a8ca949c797537a3455c2b57d9911b SHA-256: 8245f1e6e844bf5725007fd5e4466bd24473fec32d4c47bb3fc445bac627b9be

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1566.001 Spearphishing Attachment

The critical ClamAV heuristic and high-severity heuristics for VBA macros, specifically the Document_Open auto-execution and CreateObject calls, indicate malicious intent. The presence of a VBA macro in the macros.bas file, combined with the auto-execution trigger, strongly suggests the document is designed to run code upon opening. This code likely downloads and executes a secondary payload, as indicated by the 'Doc.Downloader' detection name. The embedded URL, though benign, is noted.

Heuristics 7

ClamAV: Doc.Downloader.Generic-9762674-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-9762674-0
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` `9ba8ec3966e91d175acafd30ec3438df19c84a3d5c19c35fd5e40d1b639faa28`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	20635 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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