Office (OLE) / .DOCX malware analysis — malicious · 658bf819d7e6b0ba

MALICIOUS

Office (OLE) / .DOCX

174.8 KB Created: 2020-09-28 21:56:00 Authoring application: Microsoft Office Word

MD5: 61fa0646721ac7fd31d6126900802bf0 SHA-1: 79e9f8e6e110998a2e4b986802886947bac862e8 SHA-256: 658bf819d7e6b0baafd4e46ba41a1984adea5dfe3e73194e110623c819efb8df

202 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample contains a VBA macro with a Document_Open auto-execution function, indicating an attempt to run malicious code upon opening. The script is heavily obfuscated, but the presence of CreateObject and string concatenation suggests it aims to download and execute a second-stage payload. The document body is filled with seemingly random strings, likely a form of obfuscation or a lure.

Heuristics 6

ClamAV: Doc.Malware.Generic-9769001-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Generic-9769001-0
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` `fe19635e7383e285d173bce1f5bbd9867258f7974e3830e10aecb187a337391c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6691 bytes

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