Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 6a6df4875f128657…

MALICIOUS

RTF / .DOC

31.0 KB First seen: 2023-04-05
MD5: 12ab03404ecf1f15f6a5804a86d2c44a SHA-1: e8fad76c1016ed3010a8a1b7c31ebecf39f59006 SHA-256: 6a6df4875f12865773f743e410f22a36be3255b676895cc65ef6ea357fd6a879
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 Malicious File

The sample is an RTF document containing an embedded OLE object, specifically identified as an Equation Editor exploit. The document body contains a lure instructing the user to 'Enable editing' to view the content, which is a common tactic for macro-based malware. The presence of the Equation Editor exploit suggests an attempt to achieve remote code execution upon user interaction.

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_off00004935.bin
fa5d670c4cf405ba7189174bee62d77479213ccca0225f48cf97cb4646952e93
rtf-objdata-decoded RTF \objdata at offset 0x4935 1883 bytes