RTF malware analysis — malicious · 83c0c0e6af05370d

MALICIOUS

RTF

9.2 KB First seen: 2020-02-04

MD5: f59755baa15671b02756ca189901441d SHA-1: 993c13d8101284e50a27aa3a8d2add684abe58bb SHA-256: 83c0c0e6af05370d2f115634a2c0102135404e7807a6694794560dc122e9ff14

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the object is activated, likely through a user opening the document. The file's structure and the critical heuristic firings strongly indicate this exploit vector.

Heuristics 5

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.
\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_off00000032.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x32	4660 bytes
SHA-256: `5a742bc380e0232aa2e6d5f7b106bfead92942548f7f241afdc5da5ff2faaf27`

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