Office (OLE) / .XLSX malware analysis — malicious · 7545e5553d61f9ad

MALICIOUS

Office (OLE) / .XLSX

70.1 KB First seen: 2022-06-27

MD5: 31e3c416be913006cd483927f8f607e4 SHA-1: b63c5a29b923ae64c0d73ecf7572522c48704e2b SHA-256: 7545e5553d61f9ada31fdaef91322914ad7c404e0a4d0344677e85849438c5ab

202 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The critical CVE-2017-0199 heuristic indicates that the sample is designed to act as a remote loader, leveraging a crafted OLE object to fetch and execute a payload from the specified URL. The document is encrypted, which is a common tactic to evade static analysis and hide malicious content. The embedded URL is the primary indicator of the next-stage payload's location.

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 http://blooket.github.io@itssotiny.com/WFyPS

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