RTF malware analysis — malicious · 830cfd37a5e53671

MALICIOUS

RTF

14.3 KB First seen: 2019-05-31

MD5: 12c2b1baaf9382002cfa011c05d79331 SHA-1: 355daf223f2413479703073418599067d486f992 SHA-256: 830cfd37a5e53671c0ee88066ba18c3db6271617677edd65214dbe1aa3940fd6

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document containing an embedded OLE object that triggers the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution, which is commonly used to download and execute further malicious stages. The ClamAV detection name directly indicates the exploit used.

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_off000014bd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x14BD	4662 bytes
SHA-256: `8cad3cabe8a287237badedde42dd73afd7cfc6b301ba0a4e8cdebb57c4553fed`

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