Office (OLE) / .DOC malware analysis — malicious · 7f19bc8eb8f05559

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: 2549fdb48c76b7dacf0dc369e4c7e8db SHA-1: 75036cb314bb9f1d38f600a795fdf1bbfb14568f SHA-256: 7f19bc8eb8f0555986de478bc9a17a8e052f4a9262b0a19b924d8e9c66a01ca7

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 that executes upon opening the document. This macro attempts to locate and open an embedded OLE object named 'borw4.doc' using the password '44'. The embedded OLE object itself is password-encrypted and contains suspicious static findings, including an appended payload. The overall intent appears to be the execution of malicious content hidden within the embedded object.

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` `5c4ad04f05145ca4904d2d95e27b22a8795cb82c3c8c19c5ee83d3261fbd700e`	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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