RTF malware analysis — malicious · 972b024e337faec6

MALICIOUS

RTF

12.3 KB First seen: 2018-07-27

MD5: 66ec12f72440600ab7fec7388b79ce13 SHA-1: 48d22bf8caf2ff4323261361135e59101b3686e2 SHA-256: 972b024e337faec6bb4126a8d063a2befb9c5ed6f7a4abb48e0522284cdebf83

220 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 leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to be used to execute arbitrary code, typically to download and run a second-stage payload. The ClamAV detection name directly indicates this exploit.

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
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
\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_off000010bc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x10BC	4137 bytes
SHA-256: `155fb0360b327cb6089f1ed8c78595440858fe5f2f99afb74f204b0d2d1609f1`

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