Office (OLE) / .DOCX malware analysis — malicious · 8bb69030e36b1f00

MALICIOUS

Office (OLE) / .DOCX

260.0 KB Created: 2020-05-16 15:58:00 Authoring application: Microsoft Office Word

MD5: 12b99d37cb2f0bffc45085b6c86a9114 SHA-1: 3736d05c0dd964b682325d93047919df25d6e89a SHA-256: 8bb69030e36b1f00fd751fbf9ea71559e2b79144dfe2ebcdf20051b86cc7f78a

202 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The file is a Microsoft Word document containing a critical heuristic firing for a VBA shellcode callback loader, indicating it executes arbitrary code. The presence of a 'Document_Open' macro and a large encoded blob within 'macros.bas' further supports this. The shellcode likely uses VirtualAlloc to allocate memory and then decodes and executes a payload, consistent with a dropper's behavior. No specific family could be identified, but the technique suggests a downloader.

Heuristics 7

VBA shellcode callback loader critical OLE_VBA_SHELLCODE_CALLBACK_LOADER

VBA auto-exec macro allocates executable memory, decodes a large encoded blob into that memory, and invokes it through a callback API such as LineDDA/Enum*/CallWindowProc/CreateThread. This is a native payload loader rather than a document-parser CVE primitive.
ClamAV: Doc.Dropper.Shellex-8226825-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Shellex-8226825-0
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact info 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.
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` `4863d50e7f5e28a64efe5d43324fd2e89a9d78fb8562cc139846ff126eb87cdd`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	11363 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 long base64-like blob(s).

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