RTF malware analysis — malicious · 4470fb406de3c83f

MALICIOUS

RTF

2.12 MB First seen: 2020-02-04

MD5: a4361aa81eb073427481c47fc4011a9a SHA-1: 890b6743c2d1f25f3690a97d5d78cbb8fdc57d53 SHA-256: 4470fb406de3c83f7de74e6d8587f20f87ca61841ad3a865a54cefe035fb7bc9

122 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains OLE object data and specifically triggers heuristics related to the Equation Editor vulnerability. This suggests the file is designed to exploit a known vulnerability in the Equation Editor component to achieve code execution. The large amount of hex-encoded data within the OLE object likely hides a malicious payload.

Heuristics 4

Split hex Equation Editor ProgID + OLE object critical CVE likely 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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~2210KB 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_off0000006d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6D	1107711 bytes
SHA-256: `82cb162ff4591cab227949543a08a89df40c3bca5d14870c8e8ca33c1fa67eb1`
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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