Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 54d26a878e217bc7…

MALICIOUS

Office (OOXML)

52.1 KB Created: 2021-09-14 20:28:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-09-23
MD5: 9021afcfefe0fd391eacd306de705448 SHA-1: 5734e6d6ef815b17ffa5e4a2bfe023b6ef64e73a SHA-256: 54d26a878e217bc7548eecbd70fdf8fcd22806e32b3d86fd7a45916d0f4e9243
202 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is identified as malicious due to critical heuristic firings indicating exploitation of CVE-2021-40444 via an external OLEObject. The document also contains a lure to enable content, a common tactic for malware droppers. The embedded URL http://wiyolo.com/956fb7ffae6a93d9/remove.html is likely used to fetch and execute a secondary payload.

Heuristics 6

  • External OLEObject gadget — CVE-2021-40444 critical CVE exact CVE_2021_40444
    External relationship to mhtml:http://wiyolo.com/956fb7ffae6a93d9/remove.html!x-usc:http://wiyolo.com/956 — exploitable external OLEObject gadget pattern for CVE-2021-40444
  • ClamAV: Doc.Exploit.CVE_2021_40444-9891528-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2021_40444-9891528-0
  • External relationship high OOXML_EXTERNAL_REL
    External target in word/_rels/document.xml.rels: mhtml:http://wiyolo.com/956fb7ffae6a93d9/remove.html!x-usc:http://wiyolo.com/956fb7ffae6a93d9/remove.html
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://wiyolo.com/956fb7ffae6a93d9/remove.html!x-usc:http://wiyolo.com/956 OOXML external relationship
    • http://wiyolo.com/956fb7ffae6a93d9/remove.html!x-usc:http://wiyolo.com/956fb7ffae6a93d9/remove.htmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn 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/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn 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)

Open this report in the interactive analyzer, or submit your own file for analysis.