RTF malware analysis — malicious · c4a52f2bbd8ba014

MALICIOUS

RTF

15.6 KB First seen: 2018-07-27

MD5: 5cdb56e73e95d1879d7de909f8acb565 SHA-1: c9884be09a8aa43a3dec30634b851c5038436068 SHA-256: c4a52f2bbd8ba014ee3828b24fe04998d42579b8a634d9b4f045b5ca92fad943

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document containing embedded OLE object data, specifically triggering heuristics related to Equation Editor vulnerabilities (CVE-2017-11882). The presence of ` tf_objupdate` and `rtf_ole10native_stream` further indicates an attempt to activate embedded content. ClamAV detection confirms this as a known exploit targeting Equation Editor, commonly used to deliver secondary payloads.

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_off00001a10.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A10	4662 bytes
SHA-256: `cffb04519abd9d46ea85b616ada72e11e35a46113127446bcd5173d1c1cf0119`

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