Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b2d62f4e9fbe30be…

MALICIOUS

RTF / .DOC

26.3 KB First seen: 2022-12-04
MD5: 212a9aba6446f96e50fb84be3b1efe81 SHA-1: 6a7167f955335c51cf0caeb3de3a6b840b4efb27 SHA-256: b2d62f4e9fbe30be03a9db6f5370a4493e383ae23f0a086605dc03d43e846081
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 embedded OLE object with a specific Equation Editor ProgID, and an \objupdate directive that forces OLE activation. The document body includes a lure instructing the user to 'Enable editing', a common tactic to bypass security measures and trigger exploits. This combination strongly suggests an attempt to exploit a vulnerability, likely within the Equation Editor component, 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_off00004df1.bin
e04cddc61199414250e714b6b6d47b8aad0c19c51c8b0435da309db1cbac34ee
rtf-objdata-decoded RTF \objdata at offset 0x4DF1 1555 bytes