RTF malware analysis — malicious · 7058a6513dda26be

MALICIOUS

RTF

103.4 KB First seen: 2024-09-06

MD5: 2aaf86224ef3338f2f4817f3684487b4 SHA-1: 003a2cd6e23c1e292235ac7b02ef8952834143f0 SHA-256: 7058a6513dda26becb5ddcb2446623eb1b55f62fce7af428cea58fd9fa9e1725

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The sample is an RTF document containing OLE object data, specifically targeting the Equation Editor vulnerability. The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics strongly indicates exploitation of CVE-2017-11882. This exploit is commonly used to download and execute a secondary payload, aligning with the Ingress Tool Transfer (T1105) technique.

Heuristics 3

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.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001bc3.bin` `1fe09ca913c1e33acbe070081418ebe5d1892a14949cafa1699bc8308fabc0f7`	rtf-objdata-decoded	RTF \objdata at offset 0x1BC3	2051 bytes

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