Office (OLE) malware analysis — malicious · 553b1e42c9c159fb

MALICIOUS

Office (OLE)

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

MD5: a8dab7e17cc4f330e78c04053416dc2c SHA-1: 69cffbfea43b8949592212cbf7637ec7ab62b8d3 SHA-256: 553b1e42c9c159fb9b2f5f6c1c0bde19887f9e9ba813fc442c7a253179fbeacc

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 high-risk heuristics related to VBA macros, specifically an auto-executing 'Document_Open' macro that utilizes 'CreateObject'. This indicates the macro is designed to run automatically upon opening the document and execute arbitrary code. The presence of the 'macros.bas' artifact further supports this. The script appears to be constructing commands for execution, likely to download and run a second-stage payload, though the exact payload and destination are obfuscated.

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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