RTF malware analysis — malicious · 6598d89d9bd01193

MALICIOUS

RTF

9.1 KB First seen: 2019-01-20

MD5: 3b6aa5e5062f9a66408d8054c8d99674 SHA-1: febc4064c89cc1e83a94b7081bc348d201324702 SHA-256: 6598d89d9bd0119392eebf5197f256f047eaec6210dee711b26b5c843213b469

300 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 CVE-2017-11882 within the Equation Editor. This exploit allows for arbitrary code execution when the document is opened. The presence of the Ole10Native stream and the objupdate directive further confirm the exploitation attempt. The file is classified as malicious due to this known vulnerability.

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
\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
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_off0000003a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3A	4642 bytes
SHA-256: `565703dd160a0bb4d7184b312f4a1d971f2b6b25c9a61754eff833229b5bcf24`

Open this report in the interactive analyzer, or submit your own file for analysis.