RTF malware analysis — malicious · 32f081ed320eb34c

MALICIOUS

RTF

311.4 KB

MD5: 69a2c66ac90efd678cd38a8dafd3e808 SHA-1: 1cd8eea900a562ede9149eca73afa42543c36ce8 SHA-256: 32f081ed320eb34ce8daac9b0e4e44ce93501cd24995d0a3961f7adb204aba37

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an OLE object that is automatically linked and updated, triggering the Equation Editor exploit. This exploit decodes and executes a PE file, indicating a likely delivery mechanism for a second-stage payload. The presence of RTF-specific heuristics like RTF_EQUATION_EDITOR and RTF_OBJAUTLINK strongly suggests this attack vector.

Heuristics 5

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.
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 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_off0000142c.bin` `dfd5c0e60914c3d7598920d37f7e615ae73792279114ae3e090a318551019821`	rtf-objdata-decoded	RTF \objdata at offset 0x142C	156816 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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