RTF malware analysis — malicious · 5867d3ee084f07a5

MALICIOUS

RTF

26.9 KB First seen: 2023-04-03

MD5: 8a16ed1c07b77b743749e470b82bc2c7 SHA-1: c5d8d11b75ee83418d464b343711dfbfb29f15ef SHA-256: 5867d3ee084f07a5ba2bbd1ee94f8f40f89a3d497f36d4ba9ec3582db2d3b5de

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 automatically updated and activated. Heuristics indicate a critical vulnerability, CVE-2017-11882, related to the Equation Editor, which is likely exploited to execute a malicious payload. The presence of ` tf1

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_off00000ef7.bin` `e19351ac6b469d950af49be4fb32a80e6fb39b2b391d109dab2972d307ed915d`	rtf-objdata-decoded	RTF \objdata at offset 0xEF7	4698 bytes

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