RTF malware analysis — malicious · 89d4afda02a5785b

MALICIOUS

RTF

8.3 KB First seen: 2020-05-25

MD5: 2a51afb2688c61923ad14219f97ffb1e SHA-1: 26c3e4f6bfbe5187ab276feaa635b447b173272e SHA-256: 89d4afda02a5785bf36e8c815b9fa5e799911643756878075fb36d761bb2b1b2

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Equation Editor. This vulnerability allows for arbitrary code execution, which is likely used to download and run a secondary payload. The presence of shellcode candidate regions in the extracted objdata further supports this. No specific malware family could be identified.

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
CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
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	4138 bytes
SHA-256: `949e575ec3926f04bcc82267785796c2926ea95229b0e9ac565abe0f2ce612a6`
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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