Office (OLE) / .XLSX malware analysis — malicious · 6c926210531d0159

MALICIOUS

Office (OLE) / .XLSX

48.5 KB First seen: 2022-08-09

MD5: 1f9241209dce17efcd4c1a515e9b15f4 SHA-1: 3f48ca95ac2f2031bdb12d39fc51ef5335e7b1f7 SHA-256: 6c926210531d0159e6e8e388f34da035508e7e64772770e194e3bad88cf37205

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell T1190 Exploit Public-Facing Application

The critical heuristic firing for CVE-2017-0199 indicates the document is designed to exploit a remote code execution vulnerability. The embedded URL, http://jmcglone.com@aws3.link/CpNayD, is likely used to download and execute a secondary payload. The document is password-encrypted, which is a common tactic to obfuscate malicious content.

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@aws3.link/CpNayD

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