RTF malware analysis — malicious · 68c8fa8b3f6d426b

MALICIOUS

RTF

8.3 KB First seen: 2020-01-07

MD5: 8c8d230eafb75ab17e249c75b460bf94 SHA-1: 007a143fe7c4b387c7da2a384996e0f01652da57 SHA-256: 68c8fa8b3f6d426ba3a9c4d34f9518c49341036f23cc0018b09718b3e9c93f6d

200 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, specifically identified as exploiting the Equation Editor vulnerability (CVE-2017-11882). This exploit is known to facilitate arbitrary code execution, typically used to download and run a second-stage malicious payload. The presence of shellcode candidates in the extracted objdata further supports this. No specific malware family could be identified from the available evidence.

Heuristics 5

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
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
\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_off00000032.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x32	4146 bytes
SHA-256: `847084c55414b421cbf7330d75abeb8ec82866bcf4f21812518dac8447ca3852`
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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