Office (OLE) / .XLSX malware analysis — malicious · 44ee79319152a989

MALICIOUS

Office (OLE) / .XLSX

20.4 KB First seen: 2022-05-06

MD5: d179b1b26de8d46c3719dade978ff99b SHA-1: 117304dd34df7e6bc699c1b70501acd520fcc6d8 SHA-256: 44ee79319152a9895e15333e4b6232443537b105724d9e731eb87bc978086e93

202 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The sample is a password-protected OOXML file that leverages CVE-2017-0199, a known vulnerability for remote code execution. The heuristic firings indicate that the document is an exploit carrier designed to load a remote resource. The embedded URL `https://pages.github.com@sklbx.com/vXRg5DT4` is likely the source of the second-stage payload. The document is encrypted, preventing direct analysis of its body 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 https://pages.github.com@sklbx.com/vXRg5DT4

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