RTF malware analysis — malicious · b28e30a45614f051

MALICIOUS

RTF

7.9 KB Authoring application: Riched20 6.3.9600 First seen: 2022-06-17

MD5: 69aee7a19bda34f430c6bc10f469ad58 SHA-1: e0dd4a72bbd235f24f1acf29708d19f199be7b48 SHA-256: b28e30a45614f051078abf49699a013e24376b4dd75dd7074a2099bd584d9da3

320 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF file contains an embedded OLE object specifically identified as Equation Editor, triggering critical heuristics for CVE-2017-11882. This indicates the file is designed to exploit a known vulnerability in Microsoft Equation Editor to achieve arbitrary code execution. The exploit likely leads to the download and execution of a secondary payload, although no specific payload details were extracted.

Heuristics 7

CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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` `97ad9e397eeeabec637db951725fc3a5f145e8d8a32de0be7e06cd3ccdd7011a`	rtf-objdata-decoded	RTF \objdata at offset 0x100	3546 bytes

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