Office (OLE) / .XLSX malware analysis — malicious · 4c43b04a5969b867

MALICIOUS

Office (OLE) / .XLSX

33.5 KB First seen: 2022-09-13

MD5: ef5012791693b759a27b68f63657ca0d SHA-1: d3987be46a382f696375e9653a047796d9fad8d8 SHA-256: 4c43b04a5969b867d09650558ad0d57d7b051fd03468f0ac04c417b33dbfcdf1

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The critical heuristic firing for CVE-2017-0199 indicates that this OLE document is designed to exploit a vulnerability in URL Moniker to load a remote resource. The embedded URL points to a suspicious domain, likely serving as the initial stage for a secondary payload. The document is 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-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://dummy_users@192.210.201.56/---------_.----.-----.....--_--_-------.............-/ww_e/http.doc

Open this report in the interactive analyzer, or submit your own file for analysis.