RTF / .DOC malware analysis — malicious · 8f0559fe4a7e865f

MALICIOUS

RTF / .DOC

311.9 KB

MD5: 98577e429265c6b37f377af767697a1c SHA-1: 09282a9e5ac7492f1f5e62efb92180dbcc54523b SHA-256: 8f0559fe4a7e865fe0cc4b00053964e85f0d39c8c4827484c5de463cb6453f7a

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File Execution: Malicious Code T1027 Obfuscated Files or Information

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is used to decode and execute a PE file, which is likely responsible for downloading and executing a second-stage payload. The presence of RTF_OBJDATA and RTF_OBJUPDATE heuristics further supports the exploitation of OLE object functionality.

Heuristics 4

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.
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_off00001429.bin` `ff884a121cff69b623f06266b0c839f7e40676eb273409768dce993bcd8c799c`	rtf-objdata-decoded	RTF \objdata at offset 0x1429	157026 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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