RTF malware analysis — malicious · 461d9c2ca130c482

MALICIOUS

RTF

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

MD5: c3c0fb66dbf629b58818cd111a917f65 SHA-1: 2ed31536742e5f536c105d1620eed1abce5b1b94 SHA-256: 461d9c2ca130c482c725a18f73f22f88a37c021757a4cc7d251d2ffcaa617932

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

Equation Editor ProgID + OLE object high CVE related 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.
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
\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	11328 bytes
SHA-256: `0123308151ceb2a62e9095e61988eb96022b8b2bf2f7159f67fccd6fb359827d`

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