RTF / .DOC malware analysis — malicious · fdedb88f1c6a2bd5

MALICIOUS

RTF / .DOC

126.2 KB

MD5: de99316728f4d1d9d95afdd5a7e31dcc SHA-1: 0df37809e3e5c98b1a2da9ce780f7ac8413a2ba9 SHA-256: fdedb88f1c6a2bd50d9880f653fc49a6e31208261e72ce72c8a214e1c3550812

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The critical heuristic firing confirms a decoded Equation Editor payload, and the high heuristic indicates that \objupdate forces OLE activation, suggesting the document is designed to exploit this vulnerability upon opening. The presence of an extracted PE file within the OLE object further supports the conclusion that this document is a dropper for a malicious executable.

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_off0000197d.bin` `66d911bf3d855a4e0d7bb6c6090fdefd5c664698a333066cf69df91bf9b77259`	rtf-objdata-decoded	RTF \objdata at offset 0x197D	61232 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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