Office (OLE) / .DOCX malware analysis — malicious · 62074e14407f4bc5

MALICIOUS

Office (OLE) / .DOCX

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

MD5: 53e4ede9c6d9b56b2e22ee5b81e6306a SHA-1: 012f5247020beb6c4cdb0c67838b7c3b9e5201cc SHA-256: 62074e14407f4bc511eaef884985e46bd1162b0131bb672df2221c834291cd56

262 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell

The sample contains a VBA macro that automatically executes upon opening the document. This macro utilizes CreateObject to initiate a PowerShell stager, which is heavily obfuscated. The primary function appears to be downloading and executing a second-stage payload via the encoded PowerShell command.

Heuristics 7

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.
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

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