RTF malware analysis — malicious · 4418afd27ef35e30

MALICIOUS

RTF

13.0 KB First seen: 2018-06-21

MD5: d683a82a8ca1ea961b53196744f04e66 SHA-1: 19a421f364d78318d724cc09d6ace595623a809f SHA-256: 4418afd27ef35e3018d843cdc967947125a05e9d7cd978719ce379077b203ceb

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document containing an embedded OLE object, which is a strong indicator of exploitation. Heuristics specifically identify the use of the Equation Editor vulnerability (CVE-2017-11882), a common method for client-side code execution. The embedded OLE object likely contains shellcode or a payload designed to be executed upon activation, making this a classic example of a malicious attachment delivered via spearphishing.

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_off0000138e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x138E	4159 bytes
SHA-256: `d2fbc40fb6f9aa491d2e3ba847ad3fe2a6675fcfe2fd325d37587cb6be9af804`
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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