RTF malware analysis — malicious · ea0a5a2e1551cb8f

MALICIOUS

RTF

11.7 KB First seen: 2018-11-13

MD5: 77bd60ddf3200ebeac887f5193aa06ba SHA-1: daefae91f13a4a57161b847ce2e03739db964d04 SHA-256: ea0a5a2e1551cb8f5a15a32405212b5da580e375ed98d1a8da8e77d4785fa085

320 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data specifically identified as a payload for Equation Editor, strongly indicating exploitation of CVE-2017-11882. This vulnerability allows for client-side execution of arbitrary code, likely to download and run a secondary malicious payload. The file's structure and heuristic firings directly point to this exploit.

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_off00000a2f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA2F	4666 bytes
SHA-256: `c1a5d101cda8f95b10c13c29b44c6cb9194917348be028a60a25c18c0bd63434`

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