RTF malware analysis — malicious · 1810e4b820163bad

MALICIOUS

RTF

110.9 KB First seen: 2024-10-15

MD5: 6535be26b54348be4df6f17aa902dc90 SHA-1: a3146065280b6e92fd0d00c80f936f2148ca56cb SHA-256: 1810e4b820163bad0b6bb18d917ccbc23fe4569753c03db09504415f69dcc481

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The RTF file contains an embedded OLE object that leverages a known vulnerability in the Equation Editor (RTF_EQUATION_EDITOR). The ".objupdate" directive forces the activation of this object, leading to code execution. This is a common technique for delivering secondary payloads, often downloaded from a remote server.

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_off000010b9.bin` `9ff9bc57356fd7ae0c4da48c7ac72adf962ca483c0880b959b7f640d9fc9192e`	rtf-objdata-decoded	RTF \objdata at offset 0x10B9	2233 bytes

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