RTF malware analysis — malicious · 3eb5a92bacab0fe5

MALICIOUS

RTF

27.0 KB First seen: 2023-02-16

MD5: b921193b8cb7b6e92332c09ddaf1202c SHA-1: 31c37e15a80955daa12b37439e12f4f73c896216 SHA-256: 3eb5a92bacab0fe5c84e9e519deed2585124bdb255a6b687ca47cdeffd566a59

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an OLE object with the CLSID 0002CE02-0000-0000-C000-000000000046, which is indicative of the Equation Editor. Heuristics confirm the presence of a CVE-2017-11882 Equation Editor Ole10Native payload, suggesting the exploitation of this known vulnerability to execute arbitrary code. The presence of ".\objdata" and ".\objupdate" directives further supports the exploitation of OLE object vulnerabilities.

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_off0000201a.bin` `db4dae7dbc669ec36b2f2e0820ded3137ca8a2b38db7c5ddd68f1a4f946b8644`	rtf-objdata-decoded	RTF \objdata at offset 0x201A	4205 bytes

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