Office (OLE) / .XLSX malware analysis — malicious · de1139a2cf1c1b9e

MALICIOUS

Office (OLE) / .XLSX

20.7 KB First seen: 2022-07-07

MD5: 4cbe9b7e4201048755cf6bd6d641d442 SHA-1: 4314da168d1b1b12ed9a8e6c8c80506b7ff31b34 SHA-256: de1139a2cf1c1b9e4683bc2f23c605d676541d27b24273098dd2b057f456605d

202 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1566.001 Phishing: Spearphishing Attachment

The file is an encrypted OOXML document identified as an exploit carrier. It leverages the CVE-2017-0199 vulnerability, which is known to facilitate the loading of remote resources. The embedded URL, https://www.javatpoint.com@uirk.org/ca, is indicative of a remote loader attempting to fetch and execute a secondary malicious payload.

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://www.javatpoint.com@uirk.org/ca

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