RTF malware analysis — malicious · 34cc27237a032387

MALICIOUS

RTF

8.2 KB First seen: 2022-03-22

MD5: 6467b5fafcdcde091985bb479862f34b SHA-1: 43e224ba27547ed205720a3410c88970842a77b4 SHA-256: 34cc27237a032387408e915e65119a1097bebc5bfe8091be7a17dbf9a475d11e

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains malformed OLE object data, specifically triggering the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened. The presence of ".objupdate" further indicates an attempt to force OLE object activation. No scripts were extracted, but the exploit itself is sufficient to achieve code execution.

Heuristics 4

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
\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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003d.bin` `05be9c11ad8f0d4eb50896636c86bf6311f808e18aba6071565cf7098bb344df`	rtf-objdata-decoded	RTF \objdata at offset 0x3D	4159 bytes

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