Malicious RTF — malware analysis report

Static analysis result for SHA-256 b954254715701a1f…

MALICIOUS

RTF

45.2 KB First seen: 2022-10-14
MD5: 3d5a877ea644020916fdee4e8f718a9c SHA-1: 6e2b4090deaea0b453c7b45402224c3931a39914 SHA-256: b954254715701a1f1358cd2f49efcd00385ab8371c7a86e77a842e70e58b193e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The file is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability. The document body contains a lure instructing the user to 'Enable editing' to view the content, which is a common social engineering tactic to bypass macro security. This suggests the file is likely a dropper designed to exploit the Equation Editor vulnerability to execute a malicious 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000135a.bin
733b8210c1e69c505c1f1972ba8b5609b0f7a9aad4fa2ba2d188042fb4561d9e
rtf-objdata-decoded RTF \objdata at offset 0x135A 1660 bytes