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

Static analysis result for SHA-256 dee2d8ee29814560…

MALICIOUS

Office (OLE) / .XLSX

39.6 KB First seen: 2022-07-04
MD5: 2a6ebb980adbc482e14c9b65be199acc SHA-1: 0e2e181614470fa0d14f434f836300c6f2a11046 SHA-256: dee2d8ee29814560b4db3cc190c7b256860f96c05594095146c5c755ccb5e366
202 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The sample is an encrypted Office document that exploits CVE-2017-0199. It contains an embedded URL that likely serves as a loader for a second-stage payload. The document body was not extractable due to encryption, but the exploit carrier shape and the critical CVE-2017-0199 firing strongly indicate a malicious intent to download and execute remote 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://104.168.32.31/receipt/receipt.doc?&flower=witty&wedge=screeching&stranger=muddy&shoot=cultured&feather=squalid&elm=loud&disarmament=evanescent&positive=flashy&hedge=stormy&hut=garrulous&arrow=gigantic&stream=boiling&truck=little&thistle=knowing&basket=terrible&organisation=lowly&safe=rambunctious&swallow=hard&c-clamp=zany&mezzanine=nonchalant&bath=halting&few=hushed&drum=boiling&nepal=rough&consequence=bewildered&fuel=huge&waterfall=ordinary&dew=illegal&wombat=cloistered&cheque=fat&tam=rotten&larch=gaping&alibi=somber&rheumatism=mere&month=hallowed&salt=unbecoming&badge=tacit&saxophone=lying&calcification=cowardly&castanets=shallow&pearl=wary&imprisonment=domineering&heavy=ill&pair=kind&faculty=short&hurt=abusive&stair=damaging&exhaust=late&creative=faulty&breakpoint=high-pitched&puppy=freezing&heron=cultured&zoologist=loud&stencil=poor&somersault=adorable&mission=aromatic&gate=therapeutic&tub=black&land=billowy&rubric=guttural&bankbook=somber&jewel=wet

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