RTF / .DOC malware analysis — malicious · 9a03ed302341ad4d

MALICIOUS

RTF / .DOC

1004.4 KB

MD5: 05deb6b11e87578884785dc087d91b19 SHA-1: 28887974ab10c5bcf5c50dcc14f69f3a6bd1163e SHA-256: 9a03ed302341ad4dd1c4ed26852dd0075efd0a694350dbba6378b4010a6659b5

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF file contains an embedded OLE object with decoded Equation Editor payload, indicating exploitation of a known vulnerability. The excessive hex data within the object likely hides the delivered PE file. The presence of RTF_OBJAUTLINK and RTF_OBJUPDATE heuristics suggests automatic activation of the embedded exploit. The decoded object is a suspicious artifact that warrants further investigation.

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 ~1028KB 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_off00000056.bin` `b56e7ce4d50763d2f2bb72dc752f0f783e4fdeb21aba95ead15dfb7916b21f55`	rtf-objdata-decoded	RTF \objdata at offset 0x56	514142 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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