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

Static analysis result for SHA-256 dc49395efb6ba529…

MALICIOUS

Office (OLE) / .XLS

1.38 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 1fb2442f12cad69d0d0ef888cab25a5f SHA-1: acb55b986eb8a380c0ee1c7242ae5dd3fd53bfc7 SHA-256: dc49395efb6ba5297430e2baaf368e9ae5e24d8bfa282357865cf6600731ae2e
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.005 PowerShell T1071.001 Web Protocols: HTTP T1204.001 Malicious File: Malicious Link T1566.002 Phishing: Spearphishing Attachment

The sample is an OLE file that exploits CVE-2017-0199, a known vulnerability for remote code execution. It uses a URL moniker to download a secondary payload from the domain 'short.silex.me'. The presence of a VBA macro, though not directly executable, suggests a potential delivery mechanism. The file also contains an OLE Package with an executable payload, further indicating malicious intent.

Heuristics 3

  • 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.
    URL https://picturesGood.PNG=@short.silex.me/8J8kL6?&prompt=different&minor=majestic&tooth=voracious&cafe=sweet&scanner
  • CVE-2014-4114 — OLE Package with executable payload critical CVE likely CVE_2014_4114
    OLE Package CLSID found alongside executable file references — a strong CVE-2014-4114/Sandworm-style package-dropper indicator.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes

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