Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 e486e374b0fdda5a…

MALICIOUS

Office (OLE) / .XLSX

167.7 KB First seen: 2022-07-07
MD5: 190313d4078085764b246028a7ec49a1 SHA-1: 36b825238c97f423659eb48134ee24dbf225a9e5 SHA-256: e486e374b0fdda5a5197c93b40b287281e79de5ac2170b90888e72038ddb1ded
202 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The critical CVE_2017_0199 heuristic indicates that the sample is an exploit carrier designed to download a remote document. The embedded URL points to a document hosted on an IP address, suggesting a delivery mechanism for a second-stage payload. The document is also encrypted, which is a common tactic to evade static analysis.

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://www.w3schools.com@192.227.168.194/document/inv03/receipt.doc

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