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

Static analysis result for SHA-256 496f836f4de8ae95…

MALICIOUS

Office (OLE) / .XLSX

39.4 KB First seen: 2022-07-05
MD5: 9add119c83c891469f6aacf6e1128544 SHA-1: f87dceb2802e8e10eb36b4a913da50529901ac34 SHA-256: 496f836f4de8ae952cd6749a0d8ada4d53e8095b38032b9e1b526b025ce3081d
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 T1059.003 Command and Scripting Interpreter: Windows Command Shell

The sample is an encrypted Office document that exploits CVE-2017-0199 via a remote URL. The embedded URL, http://107.173.192.152/receipt/receipt.doc, is likely used to download and execute a second-stage payload. The document's encryption and malformed structure further indicate malicious intent.

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://107.173.192.152/receipt/receipt.doc?&wad=cooing&dead=permissible&analgesia=cowardly&quiver=worthless&theism=teeny-tiny&midi=classy&birch=splendid&drain=gifted&bronco=quickest&project=flat&line=obsequious&cod=late&briefs=divergent&mile=furtive&innervation=cagey&flytrap=wry&divide=robust&crinoline=dramatic&peach=perfect&instrumentalist=rampant&mug=perfect&beggar=soft&interest=arrogant&ball=craven&automaton=massive&margaret=flowery&tie=tasteless&blade=annoying&campanile=tender&sidewalk=quixotic&coffin=rainy&disease=imported&ingrate=onerous&mover=harmonious&standoff=bumpy&mantel=courageous&chalk=wrong&purple=womanly&shanty=zonked&surgeon=steady&caftan=hollow&iraq=maddening&ephemera=overconfident&concrete=old&curve=earthy&potato=muddy&establishment=lopsided&trolley=ragged&salad=internal&twist=unsuitable&beyond=energetic&seat=wonderful&keyboarding=woozy&support=accidental&figurine=lovely&manicure=pretty&manservant=anxious&odometer=juicy&champion=permissible&marimba=stimulating&moth=successful&jailhouse=nervous&initiative=waggish&repeat=voiceless&armoire=tense&nondisclosure=scientific&tow-truck=bright&octavo=depressed&shore=frightened&pony=bad&importance=average&laptop=numerous&family=absurd&niece=adhesive&acknowledgment=lush&celeriac=shiny&eyebrows=obnoxious&heart-throb=plain&aluminium=frantic&piece=tiny&temporariness=marked&dipstick=agonizing&target=defective&shallot=changeable&chromolithograph=undesirable&stocking=fuzzy&intervenor=macho&sled=ad