RTF malware analysis — malicious · 1256f793afb38cb6

MALICIOUS

RTF

316.6 KB

MD5: 5e37b9c3ab14d8c2349506fa6be2de0d SHA-1: 1e5777efbbe88c9f92ec0438eb07d9b7c92ea43d SHA-256: 1256f793afb38cb63438acdbb6e1e3646eb66d4ecd1c4fe79178702e43311c94

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for remote code execution, likely to download and execute a second-stage payload. The presence of the Equation Editor CLSID and the specific font record overflow details strongly indicate this exploit.

Heuristics 5

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.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
\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 info 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_off00000e39.bin` `c452168daf930c2148b2317ab9988126b4391099d3831d919a64a7004b96d104`	rtf-objdata-decoded	RTF \objdata at offset 0xE39	64058 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.93, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.