Office (OLE) / .XLSX malware analysis — malicious · caf3dbb51dd53640

MALICIOUS

Office (OLE) / .XLSX

84.0 KB First seen: 2022-08-25

MD5: f061385a7cdc2319619bb9b5772e055a SHA-1: 0e9f80a94c8e6c30e8c7f91d13d8206a42c0b7dd SHA-256: caf3dbb51dd5364012b3a8aefc4ff7f8103c85c7b2732f81b965253794548235

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

The file is a password-protected Office document that exploits CVE-2017-0199. This vulnerability allows it to load a remote resource via a URL Moniker. The embedded URL, http://www.mygreatlearning.com@192.3.108.11/nmv/https_i/www.doc, is likely used to download and execute a second-stage payload.

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-128)).
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://www.mygreatlearning.com@192.3.108.11/nmv/https_i/www.doc

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