Office (OLE) / .DOCX malware analysis — malicious · 3ab666907d1caac6

MALICIOUS

Office (OLE) / .DOCX

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

MD5: 3398ce93b392b837113992ea5356ffe9 SHA-1: fd90f0d406deb4e6c3cfc8f01393d2fd704d5987 SHA-256: 3ab666907d1caac6699ea16ad02a0143d9478daeabc0fb3e5bd94199cb787774

300 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains obfuscated VBA macros that trigger a PowerShell command. This command is designed to download and execute a second-stage payload. The PowerShell command is heavily encoded, but the presence of 'powershell -nop -w hidden -enc' indicates a stager. The ClamAV detection and multiple high-severity heuristic firings, including OLE_USERFORM_OBFUSCATED_POWERSHELL, strongly suggest malicious downloader activity.

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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