Office (OLE) / .XLSX malware analysis — malicious · 7a66ae01e09079f1

MALICIOUS

Office (OLE) / .XLSX

94.5 KB First seen: 2022-08-06

MD5: ad5378f2c818c0b34f2b4a1901f84f02 SHA-1: 11041f58f0532bd8886b334c76b274b2b3723b21 SHA-256: 7a66ae01e09079f1b4e21e3939884a4649981b1848056101b00c583a8c6c1e8b

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Embedded Link T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1566.002 Phishing: Spearphishing Link

The OOXML exploit carrier shape and critical CVE-2017-0199 firing indicate that this document is designed to exploit a known vulnerability. The embedded URL `http://jmcglone.com@l-inky.com/pLScw` is likely used to download and execute a secondary payload. The document is password-encrypted, which is a common tactic to hinder static analysis and bypass security controls.

Heuristics 5

OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199

Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
Default-encrypted OOXML exploit carrier layout high OOXML_ENCRYPTED_EXPLOIT_CARRIER_SHAPE

Default-password encrypted OOXML package contains embedded OLE object parts and additional activation/decoy parts. This layout is common in malicious Excel exploit delivery and requires inspecting the decrypted package.
Office document is password-encrypted medium OFFICE_ENCRYPTED_PACKAGE

OLE container holds MS-OFFCRYPTO encrypted package (Standard Encryption (Office 2007, AES)).
Office OOXML encrypted with default VelvetSweatshop password medium OFFICE_DEFAULT_PASSWORD_ENCRYPTED_OOXML

OLE EncryptedPackage decrypts with Excel's built-in VelvetSweatshop password. Office opens this transparently, and malware uses it to hide OOXML exploit parts from scanners that only inspect the outer OLE container.
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://jmcglone.com@l-inky.com/pLScw

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