Office (OLE) / .DOC malware analysis — malicious · 3a2a1eff040a79d6

MALICIOUS

Office (OLE) / .DOC

943.0 KB Created: 2022-03-22 08:25:00 Authoring application: Microsoft Office Word First seen: 2022-03-21

MD5: f994697106f7c6cef2f394a9429d9e67 SHA-1: 15252272f8d6911731eef807a49f045ff97a8a46 SHA-256: 3a2a1eff040a79d603b1ac2609a423ad8beb46d2876aa959f60dc98477707c0f

302 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample contains a VBA macro within the Document_Open subroutine that executes a function to search for and open an embedded OLE document named 'borw4.doc' using the password '44'. The macro also attempts to create a file if it does not exist, suggesting a downloader or dropper functionality. The embedded OLE package itself has suspicious static findings, including an appended payload, indicating it likely contains a secondary stage.

Heuristics 9

Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE

A CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
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.
OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD

OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
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
Office document is password-encrypted medium OFFICE_ENCRYPTED_PACKAGE

OLE container holds MS-OFFCRYPTO encrypted package (Agile Encryption (Office 2010+)).
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://ns.adobe.com/xap/1.0/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/sType/ResourceRef#
- http://schemas.microsoft.com/office/2006/encryption
- http://schemas.microsoft.com/office/2006/keyEncryptor/password
- http://schemas.microsoft.com/office/2006/keyEncryptor/certificate
- http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `aa3225c4f8390243fa076d9e3f114a901396dad2ce355923be19474c589c14a9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1250 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ole10native_00.bin` `e1a0df9e24bdcd2211ba323347383713d3a9f86b6885f43482edf62115aa0c47`	ole-package	OLE Ole10Native stream: ObjectPool/_1709415777/Ole10Native	863511 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`embedded_office_off00004667.ole` `7ffece84b0929751f2f748118268ff6b65ea1dae4cbaaafd7ef70bd936dafcab`	embedded-office	Embedded OLE/CFB Office body inside ole container at offset 0x4667	947609 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms. Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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