RTF / .DOC malware analysis — malicious · 81de2a083840ca3b

MALICIOUS

RTF / .DOC

307.9 KB

MD5: 4a5d8bd9d3e7390859c71304be5ebd8e SHA-1: 45485bbf1affe2690da85de769cd08992eaccee8 SHA-256: 81de2a083840ca3b8e7fdf592f116a0a84c5042335d2f63c0c4ba7616f987200

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The heuristic firings indicate that the decoded object contains a Portable Executable (PE) file, suggesting it's a downloader or dropper. The ".objupdate" heuristic further confirms that the OLE object is designed to be activated, likely leading to the execution of the embedded PE file. The extracted artifact 'objdata_00_off000004b3.bin' is the most prominent 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_off000004b3.bin` `32e9cb33800dda07ac09adc8acaf96d0a279b03d54134f71f5a1ef1489975870`	rtf-objdata-decoded	RTF \objdata at offset 0x4B3	156766 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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