Office (OLE) / .DOCX malware analysis — malicious · 36d9bc33c3eb5069

MALICIOUS

Office (OLE) / .DOCX

164.4 KB Created: 2020-09-14 13:37:00 Authoring application: Microsoft Office Word

MD5: c9c618a2419e5b5577f9e02235ec7f73 SHA-1: 9f60a35c85e4e08a669fb3c2c38199fb47da1e11 SHA-256: 36d9bc33c3eb506943d6e32f31f09bc3d9e0a01125e6212fcac38cefb87f81df

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample contains a Document_Open macro that utilizes CreateObject to execute an obfuscated PowerShell command. This command is designed to download and execute a second-stage payload. The PowerShell command is heavily encoded, but appears to be attempting to access and manipulate files within the user's directory. The presence of the encoded PowerShell command and the auto-execution macro strongly indicate a malicious downloader.

Heuristics 8

Hidden UserForm PowerShell EncodedCommand stager critical OLE_USERFORM_OBFUSCATED_POWERSHELL

OLE document contains a UTF-16LE form/property string with an obfuscated PowerShell -EncodedCommand payload. The observed macro family reconstructs this hidden string with Split/Join or UserForm property reads and launches it through WMI/COM process creation. This is downloader malware, not an Office CVE exploit.
ClamAV: Doc.Downloader.Generic-9759989-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-9759989-0
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` `8c674f0aba5886399ddfdf2584c7c00f38b74378eb3e5f88c405aee7a4290c0b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22655 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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