RTF malware analysis — malicious · e6105cb31c1908a9

MALICIOUS

RTF

17.2 KB First seen: 2022-08-22

MD5: 224f9aa389351225a041506e71c8f4cf SHA-1: a38a2a882d12195cb96fd9d91162c75bdbb0ccca SHA-256: e6105cb31c1908a96aa6636ee78bef368cf6b2f803bb19090aef3eac6c85d945

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object. Heuristics indicate a critical vulnerability, CVE-2017-11882, related to the Equation Editor, which is known to be used for arbitrary code execution. The presence of ".objdata" and "ole10nAtIVe" streams further supports this. The exploit likely facilitates 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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000706.bin` `08f0c770939e5224578f2ba3ba521649e330817e2a3b294e2414f0e1ab02f308`	rtf-objdata-decoded	RTF \objdata at offset 0x706	4317 bytes

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