RTF / .DOC malware analysis — malicious · 1fb6e6de431cb735

MALICIOUS

RTF / .DOC

1.65 MB

MD5: badeca12a37ded3432f2c91260d438f7 SHA-1: d51667dcda40dcf5f99ecfcd04be6f121b4e44af SHA-256: 1fb6e6de431cb7352cb01ac2ce4a0cbeac9d50df267401a481f315b0e3bf7ff3

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The presence of a large amount of hex-encoded data within the OLE object suggests it is used to hide a payload. The RTF_OBJUPDATE heuristic indicates that the OLE object is configured to activate automatically, leading to the execution of the embedded exploit. The extracted artifact 'objdata_00_off00000e13.bin' is likely the dropped 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 ~1723KB 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_off00000e13.bin` `ec3f0328a09113dd4c2ed6fdeaacd9eaaeecba0800778361fc66bd46aab358cc`	rtf-objdata-decoded	RTF \objdata at offset 0xE13	861533 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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