Office (OLE) / .XLSX malware analysis — malicious · c58088246888e022

MALICIOUS

Office (OLE) / .XLSX

19.3 KB First seen: 2022-04-22

MD5: f7e1572fd58c7ee8fab38da6c2e9ac1f SHA-1: 362988763b5856c10d885c66a226b5dae2b1d11e SHA-256: c58088246888e0225b777dec11202c639a0f77f4e18b940b86bf2a26adaaff0d

202 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 sample is an encrypted Office document that exploits CVE-2017-0199 via an embedded OLE object. This exploit is known to download and execute a remote payload from a specified URL. The embedded URL 'https://minilinq.com/8TIe1' is highly suspicious and likely serves as the initial download location for a second-stage malicious payload. The document's encryption and the use of OLE object for exploit delivery are common techniques for evading static analysis.

Heuristics 6

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.
Encrypted Office package with CFB FAT corruption critical OLE_ENCRYPTED_AND_MALFORMED

Encrypted-package shape co-occurs with FAT-chain corruption — the documented combined evasion form.
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 https://minilinq.com/8TIe1

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