RTF malware analysis — malicious · be7759c8997e5beb

MALICIOUS

RTF

23.1 KB First seen: 2023-06-08

MD5: f773fdea0e32c51ffea025bc50767210 SHA-1: b2da34d1fe1220d90729226445b5bdbd26648e4f SHA-256: be7759c8997e5beb025ae36862d8701528df5f617c7e5fa56a2fbc7299b90289

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an OLE object with embedded data that is indicative of the Equation Editor vulnerability (CVE-2017-11882). The presence of `RTF_OBJAUTLINK`, `RTF_OBJUPDATE`, and `RTF_OLE10NATIVE_STREAM` heuristics further confirms the exploitation attempt. This technique is commonly used to deliver 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.
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_off0000090b.bin` `6c56e474328cc5babe12489158c374b9b000ee12421a57ca7ef6e5a825670af0`	rtf-objdata-decoded	RTF \objdata at offset 0x90B	4176 bytes

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