RTF malware analysis — malicious · a49a3cf3e72aacc6

MALICIOUS

RTF

541.3 KB

MD5: 9563bab56977f2394eb4540bf474ec4a SHA-1: c510463933454eb302e2188b300ee92fbed10abb SHA-256: a49a3cf3e72aacc6fa302d0b613acb1b611fd8148618a334b5bd6c47b5bac4d5

202 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1559.001 Component Object Model Hijacking T1059.001 PowerShell

The RTF file contains OLE object data and is specifically flagged as related to CVE-2017-11882, indicating exploitation of the Equation Editor vulnerability. The embedded OLE object is decoded and identified as a PE file, suggesting it's a secondary payload. The RTF_OBJUPDATE heuristic indicates that the OLE object is designed to be activated automatically, leading to the execution of the embedded malicious code.

Heuristics 6

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 2 \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_off0000135b.bin` `dcb694694d8c984274c3ac0758996102a5b11c563cd733ed801859e505f14169`	rtf-objdata-decoded	RTF \objdata at offset 0x135B	219783 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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