Office (OLE) / .XLSX malware analysis — malicious · 5185c64468d98df0

MALICIOUS

Office (OLE) / .XLSX

48.5 KB First seen: 2022-09-11

MD5: fc6f4f6dda1e746f6544bee78d81b109 SHA-1: 0e2853ea3911f552575b10df054c6df17d411d9c SHA-256: 5185c64468d98df0a81489b9038f8c44f15cff8e1bf24541db78ff7052990629

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 file is an encrypted Office document that leverages the CVE-2017-0199 vulnerability. This vulnerability allows the embedded OLE object to act as a remote loader, fetching and executing a secondary document from the specified URL. The document body is encrypted, preventing direct analysis of its content, but the heuristic firings strongly indicate a malicious exploit carrier.

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://192.210.201.56/...............-------------------------....---------......_----_--....-/www_f/www.doc

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