RTF malware analysis — malicious · 11a0b8cd8df10302

MALICIOUS

RTF

9.2 KB First seen: 2019-05-31

MD5: 6fa86a192a08fc3005dd8645c35aed11 SHA-1: ecf9f57de2de551ae891e40ff64876aab7f0fdda SHA-256: 11a0b8cd8df10302414b1e0eaabda94eaa1005c7629880392bc990083a200d29

180 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 triggers the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, indicating the file is designed to exploit this known flaw. The presence of the ".objupdate" directive further suggests an attempt to activate the embedded object, likely to deliver a malicious payload.

Heuristics 4

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000033.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x33	4649 bytes
SHA-256: `8896cccd2e9d99fd0a8d9a127f8638d96a44e02ed5d1fd5753efe4019544180d`

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