RTF malware analysis — malicious · 99c6afe6df283563

MALICIOUS

RTF

1.47 MB

MD5: 94646834cf8c644b7e6f1907034ba18d SHA-1: b5b0cc0f29ef98cb86e054a46c3e1a187474e06f SHA-256: 99c6afe6df28356385e828fbce501ae7c350e0968abb95641415b407fe1dae23

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The RTF document contains embedded OLE object data, specifically decoded Equation Editor payload and a PE file. The presence of \objupdate indicates that the embedded object is designed to be activated automatically. The excessive hex data likely hides the malicious payload, which is then executed. This pattern is consistent with exploiting the Equation Editor vulnerability to download and run a secondary stage.

Heuristics 6

Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1530KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off00001eba.bin` `75b9e26ec4bda88e67f8b43c68afceae68a0e20cf7e509a271f5686a608ba391`	rtf-objdata-decoded	RTF \objdata at offset 0x1EBA	765175 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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