RTF malware analysis — malicious · 1be6eb94c57d2c9a

MALICIOUS

RTF

16.6 KB Authoring application: Riched20 6.3.9660 First seen: 2019-11-20

MD5: e4b879873791a06d8422021b8627f51c SHA-1: f7678d0794c23f5576898d03b25412125f7c2dca SHA-256: 1be6eb94c57d2c9af87208294d42f9fc0de24c0a9053f11799b6c2d3979fd9a4

360 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects, specifically triggering critical heuristics for Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit a known vulnerability in Microsoft Equation Editor to achieve code execution. The presence of shellcode candidates within extracted artifacts further supports this attack pattern. No specific family could be identified.

Heuristics 8

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.00' 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.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
OLE object data medium RTF_OBJDATA

RTF contains 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000103.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x103	3546 bytes
SHA-256: `8a4ee6f38a24f53310249ac78c4428073e6dee39e776b0ef07c5bc9a561f7f11`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS Static shellcode analysis recovered command string(s): cmd.exe /c calc.exe # %
`objdata_01_off000021dc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x21DC	3546 bytes
SHA-256: `343730d0c623d53d3ffcf078377961623621e47c242e2babda8b1647a57f027e`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c calc.exe

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