RTF malware analysis — malicious · f287d933ff17b359

MALICIOUS

RTF

23.4 KB First seen: 2023-06-08

MD5: 3abfcd50698f63ec13889697874b0dfd SHA-1: 10934d356d6bf22b54fea6249d80f749ad746c8a SHA-256: f287d933ff17b3591ddd689172c4d8964644bf3740ac8d9418365b3b97c51c2b

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1559 Component Object Model Hijacking T1059.001 PowerShell

The RTF document contains an OLE object that leverages the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability is known to be used for arbitrary code execution, likely to download and execute a second-stage payload. The presence of objdata and Ole10Native stream further confirms the exploitation attempt.

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_off000014ce.bin` `649e7a821f123f1f79c6de14c5cbc188fc2b2349df78587f8861afe0765a0703`	rtf-objdata-decoded	RTF \objdata at offset 0x14CE	3664 bytes

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