RTF malware analysis — malicious · ea332cfba558460a

MALICIOUS

RTF

9.2 KB First seen: 2018-08-26

MD5: 4085811a1669e5ba96d17ef9dc32352c SHA-1: 18a2b237fc9e8b9640f9dde78dd4158b61d8edc3 SHA-256: ea332cfba558460adf1b6283e5159d5d6dce044e89845b0500e90beae1ed6024

320 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data, specifically triggering the Equation Editor CLSID. Critical heuristics indicate a likely exploit for CVE-2017-11882, which allows for arbitrary code execution. This exploit is commonly used to deliver secondary payloads.

Heuristics 7

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
Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE

RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
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_off0000003f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3F	4661 bytes
SHA-256: `4f950d00e9a705dcc1fe0e5e93a6d7e58661400b005b2eadfac6fd1ee60ec471`

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