RTF malware analysis — malicious · d70debda2f62051f

MALICIOUS

RTF

1.53 MB First seen: 2024-06-14

MD5: 2f35fd40cad3eb0dfce7c0e4fd397fa9 SHA-1: 78020fcdb8f784ff74fecc8302a48cf42944fdc9 SHA-256: d70debda2f62051f7754364a7520ad63c2c90fada256ac902ee2d605e0a7f9d3

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object with a suspicious Equation Editor ProgID, indicating an attempt to exploit CVE-2017-11882. The large amount of hex-encoded data within the OLE object suggests it is used to hide a malicious payload. The file's structure and heuristics strongly point to a classic exploit delivery mechanism.

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 ~1602KB 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_off000000be.bin` `c50aa6a89b1427b86a7b239b5b47c5508b2cf7cd28b2ba5a2e8f610dfb7ae82c`	rtf-objdata-decoded	RTF \objdata at offset 0xBE	801464 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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