RTF malware analysis — malicious · 397800618a5d6df3

MALICIOUS

RTF

262.1 KB Authoring application: Riched20 6.3.9600 First seen: 2021-06-17

MD5: a9eb511fd98cbac18b6c2ea528f1de72 SHA-1: ac60bd345b124d33709786d3ed3907ebc0092d70 SHA-256: 397800618a5d6df33d79f6cdba4ad742f1cb83340c9f383507e01d1d36fb0d7e

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 Microsoft Equation Editor, triggering critical heuristics for exploitation. This strongly indicates the file is designed to exploit CVE-2018-0802, a known vulnerability in Equation Editor, to achieve arbitrary code execution on the victim's system. The ClamAV signature further confirms this exploit attempt.

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000100.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x100	11470 bytes
SHA-256: `ed9bc23b4ff2b36cea95b23ed386c0087795518e496bb0d764cb4608a12500a8`

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