RTF / .DOC malware analysis — malicious · 549386047ecdc6aa

MALICIOUS

RTF / .DOC

1.85 MB

MD5: a355e925d041ecf6ecc4c4e4657d1cf1 SHA-1: ed19b855e8d3becea8040a84d0253046108952b3 SHA-256: 549386047ecdc6aae9e95af955341aa33bab92786abc6aceff5eddb9fa5c6dc9

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains OLE object data, specifically leveraging the Equation Editor vulnerability. The presence of a large, hex-encoded OLE object suggests it's used to hide a payload. The critical RTF_EQUATION_EDITOR heuristic firing confirms this exploit vector. The extracted artifact objdata_00_off000009c0.bin is likely the dropped payload or a component thereof. The attack pattern involves exploiting this vulnerability to achieve arbitrary code execution, likely for downloading further malicious content.

Heuristics 6

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
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 ~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_off000009c0.bin` `7f31ef2c102fbdbe0f79377ced9cfc835b4c65a0e1e8f0f75d550c8d86843ca8`	rtf-objdata-decoded	RTF \objdata at offset 0x9C0	967144 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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