RTF malware analysis — malicious · 7d9ca9e77c9f18f1

MALICIOUS

RTF

21.9 KB First seen: 2022-10-04

MD5: 0016247f11f7969bf64276e9d1f43f41 SHA-1: 7cc21f40f37c381c1871601ef10705b4bd36f849 SHA-256: 7d9ca9e77c9f18f17839665c83c65af1dc70bdbb087cd57fbd685a6866b5a629

180 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The RTF file contains an embedded OLE object that leverages the CVE-2017-11882 Equation Editor vulnerability. The presence of `RTF_OBJDATA`, `RTF_OBJEMB`, `CVE_2017_11882_EQUATION_OLE10NATIVE`, and `RTF_OBJUPDATE` heuristics strongly indicates that the file is designed to exploit this known vulnerability. The embedded object likely serves as a dropper for a secondary malicious payload.

Heuristics 5

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.
\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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001cb8.bin` `d1c1e4dfd2a2d38b0f8242018f7cf430bbaebf4bf494ed833c6c0a5431a26c30`	rtf-objdata-decoded	RTF \objdata at offset 0x1CB8	4190 bytes

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