RTF malware analysis — malicious · 11e8d0dcfea1be0d

MALICIOUS

RTF

15.6 KB First seen: 2018-07-27

MD5: 29766b2f019922606b07672cb0a4e36c SHA-1: 5f68175d073e391e42057a020040b88636d88bf9 SHA-256: 11e8d0dcfea1be0d94653fc85c3faccb5994e9d58e37e02ad48289898bb582bd

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	4661 bytes
SHA-256: `26547b836c8f36bb8a2f3fd4a9b94d95d615bd0f55462b3a1383414729fa1ae4`

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