RTF malware analysis — malicious · 0889e1e146f3c963

MALICIOUS

RTF

9.2 KB First seen: 2018-05-18

MD5: 6ce697f543397d765a7d642d1cca91fe SHA-1: e7f643b558ea2105decc0fada65d3e81b4b389ea SHA-256: 0889e1e146f3c963ca7d4e125ec92e6146fe8986dfd65343f756dbc3ded7badd

320 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data, specifically identified as a payload for Equation Editor, indicating exploitation of CVE-2017-11882. This vulnerability allows for arbitrary code execution when the embedded object is activated. The presence of the Ole10Native stream and the ClamAV detection further confirm the malicious nature of the file, likely delivered as a spearphishing attachment.

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_off0000003d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3D	4658 bytes
SHA-256: `bc4a113fc0b3df5dedc9f67ed963d03cc8e9468d33c72d0b728378191158a9ef`

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