RTF / .DOC malware analysis — malicious · f8256bf4c71a315e

MALICIOUS

RTF / .DOC

1.20 MB

MD5: 3507d31fc7a30a24d8a31a009c2e4d86 SHA-1: 081efffd1c33a10f6a637921246ea91bdad1b00a SHA-256: f8256bf4c71a315eb73feee981a5f9220dfb7196476d180b5375eb40bfbfc5b0

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document that contains OLE object data, specifically targeting the Equation Editor vulnerability. The presence of excessive hex-encoded data within the OLE object suggests a hidden payload. The ".objupdate" directive indicates that the embedded OLE object is designed to be activated automatically, leading to the exploitation of the Equation Editor. This pattern is commonly used to download and execute a second-stage payload.

Heuristics 5

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.
\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 ~1253KB 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_off000006e3.bin` `80789f447ebd28f16d8082175e81697199739cf52a1ae64aedb377b25ad3ec87`	rtf-objdata-decoded	RTF \objdata at offset 0x6E3	626562 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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