RTF malware analysis — malicious · 9312b12464247d46

MALICIOUS

RTF

7.1 KB First seen: 2018-05-18

MD5: 10f6a0f09e130b13cd80442efe8c73a4 SHA-1: 997b9232b0bbb5995f4cdec6e824a70210ededc8 SHA-256: 9312b12464247d462b2144b7510085bedff381cc74d2f8ef7c476c77bf5a5e4f

320 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object with a CLSID associated with Microsoft Equation Editor. Heuristics indicate a likely exploit for CVE-2017-11882, which allows for arbitrary code execution when the object is activated. The presence of the Ole10Native stream further supports this, as it often contains the payload for such exploits. The file is therefore likely delivered as a spearphishing attachment to exploit this vulnerability.

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	3621 bytes
SHA-256: `5317757598271043ca305f79a93d824bf9f1570529ddf0ecaa5003d9d135a43c`

Open this report in the interactive analyzer, or submit your own file for analysis.