Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 360cf0099658aa3f…

MALICIOUS

RTF / .DOC

28.4 KB First seen: 2022-12-12
MD5: 03e99afdb6732d483d23a1cbd9398783 SHA-1: 35fef748e5f7cf6a9ca0059116a3c7000228e26a SHA-256: 360cf0099658aa3fc518d70c660d66b16ff9710cabaad1d26ce832b6435e9843
140 Risk Score

Malware Insights

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

The file is an RTF document containing an embedded OLE object, specifically identified as an Equation Editor exploit. The \objupdate directive suggests an attempt to automatically activate this object upon opening, bypassing user interaction. The document body contains a lure to 'Enable editing', which is a common tactic to trick users into executing malicious content.

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_off00004af4.bin
40b506059c7a22fed4a695711dfe5bd8327004f9bb42c5ea4f0907abee24b1ba
rtf-objdata-decoded RTF \objdata at offset 0x4AF4 1400 bytes