RTF malware analysis — malicious · 3206c73842cc18de

MALICIOUS

RTF

25.0 KB First seen: 2023-06-08

MD5: 523638a13e3af95fc2256be66725c682 SHA-1: 4096f602f50b71a6d671d23c41f4b52dca59c8c8 SHA-256: 3206c73842cc18def9792f97c1bdb6ee85f1a396173999a42aacfa4cdb329146

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an OLE object with embedded data that is indicative of the CVE-2017-11882 Equation Editor vulnerability. The presence of `RTF_OBJAUTLINK`, `RTF_OBJUPDATE`, and `CVE_2017_11882_EQUATION_OLE10NATIVE` heuristics strongly suggests exploitation of this known vulnerability. This technique is commonly used to execute arbitrary code, likely leading to the download and execution of a secondary 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_off00001096.bin` `382a272792645688122c34853915d518d728555884a9bbb42cee3c933cda98ae`	rtf-objdata-decoded	RTF \objdata at offset 0x1096	4194 bytes

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