Office (OLE) / .XLSX malware analysis — malicious · 098055f30c84b556

MALICIOUS

Office (OLE) / .XLSX

69.8 KB First seen: 2022-06-27

MD5: e2af16f0ca09d80d34af33b8b33719b0 SHA-1: 77fc899cb75fc7ba6be7cdbb2281e2a774f8bf1c SHA-256: 098055f30c84b556ec78eee18687ca323d0deb33f4f54b0315f1db5deeca3671

202 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a password-encrypted Office document that exploits CVE-2017-0199 via an embedded OLE object. This vulnerability allows it to act as a remote loader, downloading a secondary payload from the URL http://htmlpreview.github.io@arpix.ch/TNQqo. The document's encrypted nature and the exploit carrier suggest it was designed to bypass static analysis and deliver malicious content.

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://htmlpreview.github.io@arpix.ch/TNQqo

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