Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3d6fb926860ac1ff…

MALICIOUS

RTF / .DOC

26.6 KB First seen: 2023-01-13
MD5: 49586cfd34efa4a8c3e1563544c771ce SHA-1: 4934f058f39868de13b3209565325fded2284339 SHA-256: 3d6fb926860ac1ff549892e4097f49cd8cea3e2602178acf09f4814bbc12e375
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1059.005 Command and Scripting Interpreter: Visual Basic

The file is an RTF document containing an embedded OLE object with a specific Equation Editor ProgID, identified by the RTF_EQUATION_EDITOR heuristic. The ".objupdate" directive indicates that the OLE object will be activated upon opening, likely triggering an exploit. The document body contains a lure instructing the user to 'Enable editing', which is a common tactic for macro-based malware droppers to bypass security settings.

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_off000050bd.bin
b1d10499b882bc0fb74670a395312308b2f7c503144546b97497c1f545bc0f55
rtf-objdata-decoded RTF \objdata at offset 0x50BD 1869 bytes