Win.Trojan.FormBook-6749866-0 — Office (OOXML) malware analysis

Static analysis result for SHA-256 999f84f2af4b591a…

MALICIOUS

Office (OOXML)

14.4 KB Created: 2017-09-24 17:26:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2020-02-04
MD5: a5037e4573d61da42fcd699daabaad66 SHA-1: e46a5e5b7db1d6bb016603d2385de8eb1f34b780 SHA-256: 999f84f2af4b591a9d8f86befd079f645ea51f7d11f8d8cd4cae620b21968d25
142 Risk Score

Malware Insights

Win.Trojan.FormBook-6749866-0 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is identified as Win.Trojan.FormBook-6749866-0. It contains an external OLE object and is related to CVE-2017-0199, indicating it attempts to exploit this vulnerability. The primary malicious indicator is the embedded URL http://avast.dongguanmolds.com/svchosl.123, which is likely used to download and execute a secondary payload.

Heuristics 4

  • OOXML OLE2Link remote loader — CVE-2017-0199 related high CVE related CVE_2017_0199_RELATED
    Document contains an o:OLEObject Type=Link whose external oleObject relationship points to a remote URL. This is the OOXML OLE2Link activation shape associated with CVE-2017-0199 delivery, but the local file does not expose URL Moniker bytes or a weaponized extension/content type, so the exact CVE cannot be proven statically.
  • ClamAV: Win.Trojan.FormBook-6749866-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.FormBook-6749866-0
  • External OLE object relationship high OOXML_EXTERNAL_OLE_OBJECT
    Document contains an oleObject relationship whose target is an external HTTP(S) URL. Office resolves this through OLE/object update paths rather than as a normal user-clicked hyperlink.
  • 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://avast.dongguanmolds.com/svchosl.123 In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

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