RTF / .DOC malware analysis — malicious · 79ed4a2cdf4e6d1d

MALICIOUS

RTF / .DOC

1.85 MB

MD5: a4fd638dbed65fc0f1b531fa3871df1c SHA-1: c8fe22127ba035de630131a0fd8e8910c3900fdd SHA-256: 79ed4a2cdf4e6d1d67f14a69da0879df9272ec126e6cf65b395528bd796fadef

162 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains an embedded OLE object with decoded Equation Editor payload, indicating an exploit attempt. The presence of ".objdata" and ".objupdate" sections, along with excessive hex data, suggests the object is designed to execute arbitrary code. The extracted artifact "objdata_00_off00001c17.bin" is likely the dropped payload, though its specific function cannot be determined without further analysis.

Heuristics 5

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1934KB 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_off00001c17.bin` `185d989077deeacc6a35884bbb914508e8be7d1784339380d7e7f2c61a1e6c68`	rtf-objdata-decoded	RTF \objdata at offset 0x1C17	967142 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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