RTF / .DOC malware analysis — malicious · 9b7b1715bd9e1667

MALICIOUS

RTF / .DOC

314.4 KB

MD5: 1a2da03947e401f63ad61ead0dd4a922 SHA-1: 9643684d3a085027ed4d22a64f1c756dbe0d2ab4 SHA-256: 9b7b1715bd9e1667da542769e96a85e3b30570148201043c3eaa8024a38d4d05

122 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an RTF document that leverages the Equation Editor vulnerability (RTF_EQUATION_EDITOR) to execute embedded OLE object data. This object data is decoded and appears to be a PE file, indicating a downloader or initial payload. The RTF_OBJUPDATE heuristic suggests that the OLE object is automatically activated upon opening, facilitating the exploit. The extracted artifact 'objdata_00_off00001fd5.bin' is the decoded payload.

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_off00001fd5.bin` `6014e8e9026c36ac60f3e05100396a8aecf6e0b18c981374700c455017795839`	rtf-objdata-decoded	RTF \objdata at offset 0x1FD5	156803 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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