Office (OLE) / .XLSX malware analysis — malicious · 70e729398350236c

MALICIOUS

Office (OLE) / .XLSX

84.0 KB First seen: 2022-08-25

MD5: fd391336fe25e000c70e87a15572d6a0 SHA-1: 81c097b3b8cd9733de64c71aa5e701be3221d9c6 SHA-256: 70e729398350236c149c9bf1f22d2a18ea30a6dd50a6838e6809507e93d2a1ba

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 critical heuristic firing for CVE-2017-0199 indicates that this OOXML file is designed to exploit a vulnerability in OLE2Link and URL Moniker to load a remote resource. The embedded URL, http://www.mygreatlearning.com@192.3.108.11/nmv/https_n/www.doc, is the likely source of the second-stage payload. The document is password-encrypted, which is a common tactic to obscure 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://www.mygreatlearning.com@192.3.108.11/nmv/https_n/www.doc

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