RTF malware analysis — malicious · 9615a87f7125cc6b

MALICIOUS

RTF

7.1 KB First seen: 2018-05-18

MD5: fd48c7e4b8c7b3a75e6275501a36f546 SHA-1: 22fd72147519339bbaf69f832b31800b9bc1edb7 SHA-256: 9615a87f7125cc6bd44ff11968792381009e575c2ce89bdabbbca80796c0bb7e

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is known to facilitate arbitrary code execution, typically used to download and run a second-stage payload. The presence of OLE object data and specific RTF heuristics strongly indicate this exploit.

Heuristics 6

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
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
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C	3622 bytes
SHA-256: `5ecee93e4b06e3f27ca7bd42ea5e937d3be80db54258d9c1e75a8c4f340d648f`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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