RTF malware analysis — malicious · d7738b019bad30f7

MALICIOUS

RTF

225.2 KB Authoring application: Riched20 6.3.9600 First seen: 2021-06-20

MD5: 9d703a0f664ef9d494e1d32ce383441f SHA-1: 5742c59ee90968676fefacb31462f927638989ed SHA-256: d7738b019bad30f788fab54e2672159cdac7092bf7a88a6039f25e9a3a2754c4

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object specifically identified as an Equation Editor object, triggering critical heuristics related to Equation Editor exploitation. This strongly suggests the file is designed to exploit CVE-2018-0802, a known vulnerability in Microsoft Equation Editor, to achieve arbitrary code execution. The ClamAV detection further confirms its malicious nature as Rtf.Exploit.CVE_2018_0802-6624871-1.

Heuristics 6

ClamAV: Rtf.Exploit.CVE_2018_0802-6624871-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6624871-1
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
Equation Editor ProgID + OLE object high RTF_EQUATION_EDITOR

RTF references Equation.3 ProgID alongside \objdata — likely Equation Editor (CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798) but without the binary CLSID payload, so flagged at HIGH instead of CRITICAL.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

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