RTF malware analysis — malicious · 32c8b22804e588ca

MALICIOUS

RTF

226.6 KB First seen: 2020-06-01

MD5: ce2f20a2f2a2b861db431b5ca1819243 SHA-1: b6efd7605ff1ae695ddb2c1a3be72cf85a5971b4 SHA-256: 32c8b22804e588ca28afb67ef347b7cc124713b8f68d5e5586a5bc72b9c2ab43

160 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE object data and triggers heuristics indicating the exploitation of CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution, likely to download and run a secondary payload. The presence of the objdata artifact further supports the exploitation vector.

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off0000136c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x136C	65646 bytes
SHA-256: `b2b293653e97165cc3a4d7578b20bc14ed0694c03d6e746b2f6ad8b653eb45c2`

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