Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a5da3806f527cf4d…

MALICIOUS

RTF / .DOC

59.5 KB First seen: 2023-09-14
MD5: ae1d87f464d461d99b30cac5281b7996 SHA-1: f64fdb90007a6df2367647ca72c0f1f9750a4c8f SHA-256: a5da3806f527cf4d8bf0543abad4f1a1d4e5795cfb10336533938100d630c62e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1059 Command and Scripting Interpreter

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The 'SE_ENABLE_LURE' heuristic indicates the document prompts the user to enable editing, which is a common social engineering tactic to bypass security measures. The presence of ".objdata" and ".objupdate" further confirms the exploitation of OLE object handling within RTF.

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_off000038e2.bin
35b624d9517c8dd963f20c6565d1a7a1dbaacd1f929bb6a862c1409302543a86
rtf-objdata-decoded RTF \objdata at offset 0x38E2 1743 bytes