Office (OLE) / .DOCX malware analysis — malicious · bf0c0d8405f31ddf

MALICIOUS

Office (OLE) / .DOCX

156.6 KB Created: 2020-09-23 17:49:00 Authoring application: Microsoft Office Word

MD5: 7897f9a2476d1a1281f9734082e7e52c SHA-1: 1701e8699cd17d45ea9bb5a533953d05f17add8a SHA-256: bf0c0d8405f31ddf2f8f42f73b66516e529a85f5045cd102ad36dd7dc5bca66c

240 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical ClamAV detection 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, coupled with the 'OLE_VBA_PCODE_AUTOEXEC_EXEC' firing, strongly suggests that the macro is designed to run automatically upon opening the document. This macro likely downloads and executes a second-stage payload, as indicated by the 'Doc.Downloader' ClamAV signature.

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` `3fdc5dc9fa6dbe05ddbb5394ffbf1a5da353d311eafd75c86ddc522f2b658b58`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	19358 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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