Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0ad39ce3358ed09e…

MALICIOUS

RTF / .DOC

13.3 KB First seen: 2022-11-01
MD5: d0a416b0a75f04913ad613c8a09610e8 SHA-1: 470b8cd5facfd77a5728b2720a6fa9249e046ac2 SHA-256: 0ad39ce3358ed09ef8973226c129a23c61c1de1dcb79d92d006dddd42ed59142
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 that leverages the Equation Editor vulnerability. The document body contains a lure instructing the user to 'Enable editing' to view the content. This combination strongly suggests a malicious document designed to exploit the Equation Editor vulnerability (CVE-2017-11882) to execute 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
  • 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_off00001e69.bin
ff03604a92062ebbfd0ee5707182b32205b075a2cbaa9a6a4245d9396890c181
rtf-objdata-decoded RTF \objdata at offset 0x1E69 1410 bytes