Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b6a253f5babbcdd5…

MALICIOUS

RTF / .DOC

30.6 KB First seen: 2022-12-07
MD5: 496d7804b08e1b4a1adf8cff0e088cf8 SHA-1: a1621e7dbefef70f1917ccbeead67ec3aa5fed53 SHA-256: b6a253f5babbcdd5a715224a5e91e96b05f39b4ef285f696ffbc705c0a78a34d
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1059.005 PowerShell T1204.002 User Execution: Malicious File

The RTF document contains an OLE object with an Equation Editor ProgID, indicating a likely exploit targeting this component. The presence of \objupdate suggests an attempt to automatically activate the embedded object upon opening. The SE_ENABLE_LURE heuristic confirms the document instructs the user to enable editing, a common social engineering tactic to bypass security measures and trigger the exploit.

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_off000051f6.bin
e2e77fff09ceebcc084e36fba82a7aa5af1134845f557a601c7563e743845cbf
rtf-objdata-decoded RTF \objdata at offset 0x51F6 1879 bytes