RTF malware analysis — malicious · 78562a8dc7c58f9a

MALICIOUS

RTF

24.7 KB First seen: 2023-06-10

MD5: 4dcb360da811ecbe897b157b9c9e56fb SHA-1: 44a8c43539d77fc8bb03f0694db3976a5fcb4cfb SHA-256: 78562a8dc7c58f9a9b93a4fd7cb109308c375c8313597be1232c7d6af20f4343

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This technique is commonly used to deliver a second-stage payload. The presence of the Ole10Native stream and the objupdate heuristic strongly indicate exploitation for arbitrary code execution.

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_off00001b1c.bin` `a753d7c1141441eb2df47b288fc356fe50fa0ab7d217bdfa37e3b5b0b91c2f37`	rtf-objdata-decoded	RTF \objdata at offset 0x1B1C	3670 bytes

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