RTF malware analysis — malicious · 83241045b3bf3099

MALICIOUS

RTF

32.1 KB First seen: 2020-02-04

MD5: 9f4da169634153f11f700df45d97f46a SHA-1: 72c3f3c932a1a2e319fa1bf4e95ba4b0d78d96d9 SHA-256: 83241045b3bf3099fd6ca16cfbbcd7e8afa91c2613698ff3cd04b8e83075b494

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 leverages the CVE-2017-11882 vulnerability in Equation Editor. This vulnerability allows for arbitrary code execution when the object is activated, likely through a ".objupdate" directive. The exploit is designed to bypass security measures and deliver a malicious payload.

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_off0000006c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6C	13306 bytes
SHA-256: `0016f241ad4fcd9a8eaab38d1c7b7e778c021169a2b152e6dbfa30d19cf5bcbd`

Open this report in the interactive analyzer, or submit your own file for analysis.