RTF malware analysis — malicious · ff73b14ec349d4e4

MALICIOUS

RTF

91.9 KB First seen: 2024-10-06

MD5: c1f6c58e88f5da3be54e8ba77fd23bf4 SHA-1: 6366e09cc639b57dd58fb68f647c3dd9cbb40d11 SHA-256: ff73b14ec349d4e4c76cfa28054ce4d0f6305a02a642bd86de2ca3d57648fb52

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The sample is an RTF document containing an embedded OLE object that exploits a vulnerability in the Equation Editor. The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics strongly indicates exploitation of CVE-2017-11882. This technique is commonly used to download and execute a secondary payload, hence the high confidence in the attack pattern.

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_off0000166a.bin` `96237563bec817dab731b185352a1997887b84f969e10548347a50e7467d26d5`	rtf-objdata-decoded	RTF \objdata at offset 0x166A	2199 bytes

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