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

Static analysis result for SHA-256 379fe2ae5a34b234…

MALICIOUS

Office (OLE) / .XLS

1.07 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 6bcc53dc843155e886f469778b4216f1 SHA-1: ca277194f41d84c108389a788d7281e7566ed9f0 SHA-256: 379fe2ae5a34b2349fe492b4318c589416c5cc8f1e54eb1502455863da17395e
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.005 PowerShell T1059.001 PowerShell

The critical heuristic firing for CVE_2017_0199 indicates that the OLE2Link object is attempting to load a remote resource from the provided URL. This is a common technique for downloading and executing a second-stage payload. The ClamAV detection further confirms the malicious nature of the file, classifying it as a downloader trojan.

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
382fc1344a2f0cf6eda18645d41def8d571debc6637bc7fe02a5c83715a51bef		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2112 bytes

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