RTF malware analysis — malicious · e1666e5a8630c331

MALICIOUS

RTF

7.4 KB First seen: 2019-09-30

MD5: 16b1850c9e81014fb313475753c3af40 SHA-1: efc6afd291e5d639b40baa17ee42395ed7ceb5ca SHA-256: e1666e5a8630c3314e5b499a37b1c34f6191fff8533888a62c0f1f4173e88bf6

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 leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of OLE object data and specific Equation Editor CLSID firings strongly indicate this exploit vector.

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

ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00000036.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x36	3647 bytes
SHA-256: `d99bdeec1d1c3d0cc4158709be528a63f8662406871924b5afe734d5bba72fbb`
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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