RTF malware analysis — malicious · 95e84f755a5dce6c

MALICIOUS

RTF

13.8 KB First seen: 2018-10-07

MD5: 707602e57ebfa4b2ad8dc09213346e81 SHA-1: 551e4b3dc75e678ec7f3fcdc301d077d73f08771 SHA-256: 95e84f755a5dce6c4538fa8dad02bfc20790adef5e6eb6d5fc6074216a72baaf

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document identified by ClamAV as Rtf.Exploit.CVE_2017_11882-6584355-1, indicating exploitation of the Equation Editor vulnerability. Heuristics confirm the presence of OLE objects and the use of \objupdate, strongly suggesting code execution via this exploit. The embedded OLE object likely contains shellcode or a dropper for a secondary payload.

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
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
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_off00001579.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1579	3893 bytes
SHA-256: `b83f9b5e88e13996f91b55bdafb2a4cb32b2eb72886a6945ac753f198fc1739f`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL, SC_PEB_ACCESS, SC_GETPC_CALL Static shellcode analysis recovered API/import strings: LoadLibraryA, GetProcAddress, ExitProcess, URLDownloadToFileW, CreateProcessW

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