Malicious RTF — malware analysis report

Static analysis result for SHA-256 474ac5e81db5ed4a…

MALICIOUS

RTF

38.1 KB First seen: 2022-12-28
MD5: 5eb74924e2083fee5da20a0343e5e4ab SHA-1: 58127c29a5f8b65cfa2b87f89ea10fa9fe6e3b7a SHA-256: 474ac5e81db5ed4ada0f8c6137dfbe478ae79639568be5a268c9d959ee6fe2d0
200 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object specifically identified as related to Equation Editor, triggering critical heuristics for CVE-2017-11882. The document also contains a lure instructing the user to 'Enable editing', a common tactic for macro-based malware. The embedded object's ProgID 'equaTioN.3' is a key indicator of this exploit.

Heuristics 6

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • 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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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_off00005a68.bin
1136d1b123fde9146b8bbdc1c50964ecab330c94605b6e83ca9c465b079de3f8		 rtf-objdata-decoded RTF \objdata at offset 0x5A68 1776 bytes

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