Office (OLE) / .DOCX malware analysis — malicious · 4c238bc4a71797dc

MALICIOUS

Office (OLE) / .DOCX

153.0 KB Created: 2020-09-14 18:36:00 Authoring application: Microsoft Office Word

MD5: 6b5d3153eff4b7b84d00409a9704940f SHA-1: 83b88498357751c4a951e11127e45ed98c6e3a32 SHA-256: 4c238bc4a71797dc06d39c3e4b3dffa290150e757c9a4398c8241ecbae65485e

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample contains a Document_Open macro that utilizes CreateObject to execute an obfuscated PowerShell command. This PowerShell command is designed to download and execute a second-stage payload. The obfuscated PowerShell string was reconstructed from the document body. The presence of a Document_Open macro and the execution of PowerShell are strong indicators of malicious intent.

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.Malware.Generic-9760286-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Generic-9760286-0
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` `1292a632e7e589fe2af40be48c7cc33bf98b796b982d17887300d79315ad06a4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18499 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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