RTF malware analysis — malicious · b7a96bdaef2d515b

MALICIOUS

RTF

15.6 KB First seen: 2018-11-05

MD5: d42314abcc3b52b09ce6bf3b58653594 SHA-1: 7882475fed28e610438e3cddcb0c89513c6b735b SHA-256: b7a96bdaef2d515baedd0cf0bbfd9e8a031f5e45834255a0f5eb97de3d38c961

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	4644 bytes
SHA-256: `3ce881657b984e3274b94a5d49777d3462ab779d8fee3c1cedd4b4185faa8f80`

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