RTF / .DOC malware analysis — malicious · 754167414afdaeb5

MALICIOUS

RTF / .DOC

157.2 KB First seen: 2023-02-20

MD5: b8d5538fb414cca7a79aa0469a5c7a90 SHA-1: 99e1d06cfb8662e7404cc1bb86d3fef3b7a1cad3 SHA-256: 754167414afdaeb50e1024fd3055bda3333ce9b4d9e50ffadce95e5156e1f5b5

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File Execution: Malicious File T1559.001 Component Object Model Hijacking: Component Object Model T1059.003 Command and Scripting Interpreter: Windows Command Shell

The RTF document contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is used to decode and execute a Portable Executable (PE) file, likely a second-stage payload. The presence of ".objdata" and ".objupdate" sections further indicates the use of OLE object manipulation for malicious purposes.

Heuristics 5

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
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_off00000075.bin` `20c54ec0a98fc2361a90b3cd5f9c53d597401532a64c778cde3e568e6a1078f7`	rtf-objdata-decoded	RTF \objdata at offset 0x75	80397 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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