Office (OLE) / .DOCX malware analysis — malicious · 839b81c515a28cbf

MALICIOUS

Office (OLE) / .DOCX

177.4 KB Created: 2020-09-18 20:16:00 Authoring application: Microsoft Office Word

MD5: 91a6787e72dd6bb1b80010f8158972e3 SHA-1: df622dfc41cbce53f8376f49d39591dd77fee0d6 SHA-256: 839b81c515a28cbffefef43ee886190e4de7528359cb1e5c7e2e9b4cf8ce5aa9

240 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains a Document_Open VBA macro that utilizes CreateObject, indicating an attempt to execute arbitrary code. ClamAV detection as 'Doc.Downloader.Mryu-9763604-0' strongly suggests this macro is a downloader for further malicious payloads. The presence of VBA macros and the auto-execution behavior are key indicators of this malicious functionality.

Heuristics 7

ClamAV: Doc.Downloader.Mryu-9763604-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Mryu-9763604-0
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` `4d4d8e1bba49d1cabf8de0e91ffc09553042ec2becc836c612f84309d5ca532f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	19651 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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