Office (OLE) / .XLSX malware analysis — malicious · ce779c38729b3e94

MALICIOUS

Office (OLE) / .XLSX

173.0 KB First seen: 2022-09-21

MD5: de144239fedd44e29206e585a7223224 SHA-1: aa63d6193a0b39e5a0e00aa3190f220f89078112 SHA-256: ce779c38729b3e942e1812a1abedda88737ba35aa596e284e4eca59fb7c70190

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment

The sample is a password-encrypted Office document that exploits CVE-2017-0199. The exploit carrier is an embedded OLE object that references a remote URL, indicating it's designed to download and execute a second-stage payload. The document body is encrypted, preventing further analysis of user-facing lures.

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://5.161.156.147/--------__---------_______----_-_-_-------....--------/.............44.doc

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