Office (OLE) malware analysis — malicious · 7f270bf002e459e8

MALICIOUS

Office (OLE)

153.7 KB Created: 2020-09-14 22:09:00 Authoring application: Microsoft Office Word

MD5: 8d843402d4e0e08ad31979ecbd8c3562 SHA-1: 4123c453c1374234778861bc0efeede650d5b2c0 SHA-256: 7f270bf002e459e860698dbefae6fed9ece80b03830e5fc6bb156d2c5cd8f65f

240 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is identified as malicious by ClamAV and exhibits critical heuristic firings for VBA macros, specifically a Document_Open auto-execution macro that uses CreateObject. This indicates the macro is designed to run automatically upon opening the document. The presence of the 'macros.bas' artifact and the nature of the heuristics suggest the macro attempts to download and execute a second-stage payload. The reconstructed string from the VBA code, 'W' + '_' + '1' + 'y' + 'z' + '1' + 't' + 'l' + 's' + '1', likely forms part of a command or URL used in this process.

Heuristics 7

ClamAV: Doc.Malware.Generic-9760527-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Generic-9760527-0
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` `bf2dc6e4793502154f28a14458af4f5198ccc48932a5641a4c34f7f1fcdc0c82`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18582 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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