RTF malware analysis — malicious · 753b1948db224a5e

MALICIOUS

RTF

24.4 KB First seen: 2023-05-05

MD5: 3f75b4fdca6b5faac7e268b2dbec9b62 SHA-1: 0f59c37389349d94b1e036ee2e9d0ea570b9b87a SHA-256: 753b1948db224a5e4720d6581fdd6f1f24f4897f60c550f9d6b08ada15c14a65

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The RTF document contains an OLE object with a decoded payload indicating exploitation of CVE-2017-11882. The presence of ` ft_objdata`, ` ft_objautlink`, and ` ft_objupdate` heuristics further confirms the malicious nature of the embedded object. The primary attack vector is likely spearphishing, leveraging the known Equation Editor vulnerability to execute arbitrary code.

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_off00000e45.bin` `2377e9175ce90603b2d24955875d05a1274d3137dad10687889fa34785070cda`	rtf-objdata-decoded	RTF \objdata at offset 0xE45	4176 bytes

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