Malicious RTF — malware analysis report

Static analysis result for SHA-256 5451bce754f64f99…

MALICIOUS

RTF

90.9 KB First seen: 2024-07-26
MD5: 02f4c5ec7b7df33ebc8d9bcedc15f61e SHA-1: 5f4a15f00b5759e1a85f48b700c17c34da5a7e4a SHA-256: 5451bce754f64f99ef4d135d9d1cd709021200637cb892cc88dca5680c2f94a4
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The sample is an RTF document that contains OLE object data and specifically triggers the RTF_EQUATION_EDITOR heuristic. This indicates the exploitation of a vulnerability within the Microsoft Equation Editor component, likely to achieve remote code execution. The presence of ".objupdate" further suggests that the embedded OLE object is designed to be activated automatically, leading to the download and execution of a secondary payload.

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.

FilenameKindSourceSize
objdata_00_off000017ae.bin
b2a518824388d134962bbce571a375b927ca100d20404c0079208e30c6901cd8		 rtf-objdata-decoded RTF \objdata at offset 0x17AE 1977 bytes

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