Office (OLE) / .DOCX malware analysis — malicious · c76525bd73dde3dc

MALICIOUS

Office (OLE) / .DOCX

165.6 KB Created: 2020-09-14 11:42:00 Authoring application: Microsoft Office Word

MD5: 8047c01b45388577d3a983c4304591d0 SHA-1: 13179f25930bfaa493098befe8ea52e5d9d5eb48 SHA-256: c76525bd73dde3dcb789c790c7d1051e3f41fd7a7ae52e85dbaafae57079b632

300 Risk Score

Malware Insights

MITRE ATT&CK

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

This document contains a Document_Open macro that utilizes CreateObject to execute an obfuscated PowerShell command. The PowerShell command is Base64 encoded and appears to be a stager designed to download and execute a second-stage payload from a remote source. The presence of an obfuscated PowerShell stager and the ClamAV detection strongly indicate a downloader malware.

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-9759992-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-9759992-0
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` `21906a5a0abde96faec8374301375697a3e8b4bd728c1429248ea92df8224a99`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	25189 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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