Malicious RTF — malware analysis report

Static analysis result for SHA-256 4417a35b1aab9abe…

MALICIOUS

RTF

11.9 KB
MD5: 6bf154436c2394e574d3e6ef6fdb1592 SHA-1: 751c0a785b1137c48e09821b1382a9d453499c81 SHA-256: 4417a35b1aab9abe76e8d61ec1fea70482d7e4cc4136434324b4023f5574afe4
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File Execution: Malicious Code

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability. The critical heuristic 'RTF_EQUATION_EDITOR' and the high heuristic 'RTF_OBJUPDATE' strongly indicate exploitation of this vulnerability. The presence of OLE object data further supports this. The file is classified as malicious, and the attack pattern involves exploiting this known vulnerability to execute arbitrary code.

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.

FilenameKindSourceSize
objdata_00_off00001e2a.bin
9c910e973ce9f6c4cd5ee7c7348f77e33efe15b6b510cf3e360d96d722de9f54		 rtf-objdata-decoded RTF \objdata at offset 0x1E2A 1557 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.