RTF malware analysis — malicious · 4557d7258191d222

MALICIOUS

RTF

15.6 KB First seen: 2018-07-23

MD5: e4995581362202ea85ed82267e709d40 SHA-1: b6aeaa613ab6980504da5e0ec3a7d1c24e646003 SHA-256: 4557d7258191d222369f25d5ca72d07334ec6922311d5762328f6a6bb9acd1d9

320 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object with a CLSID indicative of Microsoft Equation Editor, specifically triggering the CVE-2017-11882 vulnerability. This exploit is known to allow for arbitrary code execution, which is likely used here to download and execute a secondary payload. The ClamAV detection name further confirms the exploitation of this specific CVE.

Heuristics 7

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
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_off00001a14.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A14	4646 bytes
SHA-256: `30f57d966df0e70616a2c215731f3b80f423efc209699f9e6b1852ab82e41726`

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