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

Static analysis result for SHA-256 aca81cde18c7fe39…

MALICIOUS

Office (OLE) / .XLS

1.30 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b271becd6dd76a902d4374ce60edbcea SHA-1: 462290f5cd625b6e7c5f390f989674fe6f87636f SHA-256: aca81cde18c7fe3986668dda6e66b95de6826d6a6cb916e3507380b96800b96b
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.005 PowerShell

The critical heuristic firing for CVE_2017_0199 indicates that the OLE object attempts to load a remote resource from the URL http://tny.wtf/Zfp4WP. This exploit is commonly used to download and execute a second-stage payload. Although VBA macros were present, they contained no executable statements, suggesting the exploit is directly embedded within the OLE structure.

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.
  • ClamAV: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0
  • 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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