RTF malware analysis — malicious · ff39e5697477318a

MALICIOUS

RTF

8.1 KB First seen: 2020-02-04

MD5: 14d2dbb3d83182a720d609c021d65bfd SHA-1: 25a5eae940711883302817ffe1eeaed3361d9eec SHA-256: ff39e5697477318a9eab67086445bb6be00b575876602b526b26f94b367f79f1

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that leverages the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the object is activated. The presence of the ".objupdate" directive further indicates an attempt to force the activation of this embedded object.

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	4138 bytes
SHA-256: `5c764c15e4fb5db65748bd162eb606bf4ee0f85c34198ed3d5efe423071a98cf`

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