RTF / .DOC malware analysis — malicious · ede0c266836e85d1

MALICIOUS

RTF / .DOC

1.75 MB

MD5: 50fae186ae94fbff80dd36aa7b1f4ccb SHA-1: 124e3f817e12c6ac42e5a4185f75fb5d62bc9513 SHA-256: ede0c266836e85d1ac3bc623377fda09bb0135a9746a0ecde6d7c52c7eddfc24

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an RTF document that contains OLE object data, specifically targeting the Equation Editor vulnerability. The presence of large hex-encoded data within the OLE object suggests a hidden payload. The RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics strongly indicate exploitation for client execution, likely to download and run a secondary 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 ~1824KB 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_off000018b4.bin` `b26c0c60808e06b0097cc46385f8091b08c483ba9c0ea0d8e2ab3a6f56e1a612`	rtf-objdata-decoded	RTF \objdata at offset 0x18B4	912374 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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