RTF malware analysis — malicious · 6c84c0915e78fb62

MALICIOUS

RTF

22.8 KB

MD5: 441131e73b624827fc3475133666f45f SHA-1: 65fb5faac9e8979c0175aa77af6bda8eafbc8169 SHA-256: 6c84c0915e78fb6256174b0f6b265a8a07215d959c800b588f4b5f0ec7b14c32

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing an embedded OLE object that leverages the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is known to be used for arbitrary code execution, typically to download and run a second-stage payload. The presence of the Ole10Native stream and the objupdate heuristic strongly indicate this exploit is present and intended for activation. No specific family could be identified from the available evidence.

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 2 \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_off00000679.bin` `5f31f4d2c92af8e6e369962f2da36e62c2dc8ec93807773f8c5b4f6e2fe5536b`	rtf-objdata-decoded	RTF \objdata at offset 0x679	4709 bytes

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