RTF / .DOC malware analysis — malicious · ac9a33415eb6ec83

MALICIOUS

RTF / .DOC

309.0 KB

MD5: 3862e09a5b864a2c9e12d26c58822df4 SHA-1: 131fb28846dcaf6e98a284dbb29c5e34c5e2a936 SHA-256: ac9a33415eb6ec83ead8f10e2f749b5d5c53f7fb9e758d686e1b01819b44c86a

122 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell T1105 Ingress Tool Transfer

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is used to execute arbitrary code, which in this case is a PE file. The decoded payload is likely responsible for downloading and executing a second-stage payload from a remote location, as indicated by the 'RTF_EQUATION_EDITOR' and 'RTF_OBJDATA' heuristics. The extracted file hash is provided as an IOC.

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_off00000a79.bin` `fef7301e18b6874fadb2cf408e8e95431cdb81f56c59e94cd5706a4e04ca6f3f`	rtf-objdata-decoded	RTF \objdata at offset 0xA79	156585 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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