Office (OLE) / .XLSX malware analysis — malicious · daee0e792987db3b

MALICIOUS

Office (OLE) / .XLSX

20.6 KB First seen: 2022-04-13

MD5: 103a0a0dc0c7bbd2a3d3545154e3555c SHA-1: 7e7bb4cdbe8111712ff43d7852cef545cb93167f SHA-256: daee0e792987db3b5a72ffbb354f20219494fe746e08d7e7ebd1703dcb51a97c

202 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

This XLSX file is password-encrypted and contains an embedded OLE object that exploits CVE-2017-0199. The exploit is designed to act as a remote loader, downloading a secondary payload from the URL https://littleurls.com/CMYaA. The presence of the OLE object and the specific CVE exploit indicate a malicious intent to compromise the user's system via a remote download.

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://littleurls.com/CMYaA

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