RTF malware analysis — malicious · 29894cfea1f1f742

MALICIOUS

RTF

118.5 KB First seen: 2024-07-18

MD5: e5102c5df398cf5130a0367e6b2a37c3 SHA-1: 4ec1eb316c8fbe5e71ab162ef86ed5e9929e3750 SHA-256: 29894cfea1f1f742f90e595a4b0e19b3de66d14eef3209331d653b5f49da8c62

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The critical RTF_EQUATION_EDITOR heuristic indicates the file exploits a known vulnerability in Microsoft Equation Editor. The presence of OLE object data and an update trigger further supports this. The likely goal is to download and execute a secondary payload, as suggested by the combination of exploitation and object embedding.

Heuristics 4

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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001d8f.bin` `b492612c26e3c04ee51c31bde3b1f1015bb2a59c90ec832036738b7a364da830`	rtf-objdata-decoded	RTF \objdata at offset 0x1D8F	2301 bytes

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