RTF / .DOC malware analysis — malicious · fdf939f394771c4e

MALICIOUS

RTF / .DOC

1.85 MB

MD5: bc7f085da0717ce2b087f9743d2663d6 SHA-1: c148128be910afd96d77afe815f8b3c6f41e4801 SHA-256: fdf939f394771c4e6a044924046b7082e87bbd2536fc2efe478bd0cc5753b2d8

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). Static analysis indicates this object contains a decoded PE file, likely a secondary payload. The presence of ".objdata" and ".objautlink" heuristics, along with the "RTF_EQUATION_EDITOR" firing, strongly suggests this exploit chain. The large amount of hex-encoded data within the OLE object further supports the hiding of a malicious payload.

Heuristics 6

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1933KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00001ca6.bin` `1f35f42df6ccc341ba94f4244be6e305090b670d8d58601f01ce1c0f1f5c123b`	rtf-objdata-decoded	RTF \objdata at offset 0x1CA6	966992 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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