RTF malware analysis — malicious · bb67f8529f949557

MALICIOUS

RTF

231.4 KB Created: 2021-02-12 04:30:00

MD5: 05e8d895829e0485046208f42edcbf94 SHA-1: 63c36fefc820ef1533947eb219a7d0f1e24d8701 SHA-256: bb67f8529f949557eb5363840b83243d17437e1a0abfef67db560996539eca50

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in the Equation Editor. This vulnerability allows for arbitrary code execution when the object is activated. No scripts were extracted, and the document body appears to be benign tabular data, suggesting the exploit is the primary malicious component.

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
ClamAV: Rtf.Exploit.CVE_2018_0802-6825822-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
\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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000106.bin` `6f2546660c8101ee0d9e665b909f246ad752d2bccf8a495e5f3cd8f35d9fe6fe`	rtf-objdata-decoded	RTF \objdata at offset 0x106	3628 bytes

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