RTF / .DOC malware analysis — malicious · 1f9d1bffe188b76b

MALICIOUS

RTF / .DOC

1.26 MB

MD5: 44cce032ed68104da1f632d18dd16971 SHA-1: 415e8f97c4ad9392ee905cef88b814f0fd4162a2 SHA-256: 1f9d1bffe188b76bbd97cb2fd59ab47248b71fcede2f415ca29fcc0f1040bbee

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The heuristics indicate that this object contains decoded payload data and a PE file, suggesting it's designed to exploit this vulnerability upon opening. The large amount of hex-encoded data further supports the hiding of a malicious payload. The primary attack vector is likely a user opening the RTF file, triggering the Equation Editor exploit to download and execute a secondary payload.

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 ~1320KB 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_off00000c61.bin` `4721de81c9353f5ceb98a8860b2018b7e3c07ade36406f9ca077fe58fadba1e1`	rtf-objdata-decoded	RTF \objdata at offset 0xC61	660297 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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