Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 5eb0ab0dca0d0c68…

MALICIOUS

RTF / .DOC

26.0 KB First seen: 2022-11-08
MD5: f91a747333dd97fca8e79cf5d86d43a5 SHA-1: a9afd756c2276f62862addd1dd1dca3621c97900 SHA-256: 5eb0ab0dca0d0c687af74fa0d578a61d7ca8cbdc722cfe61ab9d5f3e81f8e710
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object with a split Equation Editor ProgID, and an \objupdate directive that forces OLE activation. The document body contains a lure instructing the user to 'Enable editing' to view the content, which is a common technique for macro-based malware droppers to bypass security settings. The embedded OLE object likely exploits a vulnerability, such as CVE-2017-11882, 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_off0000514e.bin
5717a1a20833c0cdbfb050f939833d86f51425aa3c3310cc42c576b3e8e4a3b0
rtf-objdata-decoded RTF \objdata at offset 0x514E 1627 bytes