Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a75be7d0f06e60c6…

MALICIOUS

RTF / .DOC

29.8 KB First seen: 2023-04-13
MD5: d1091aedd81d13d59dc3d8d5c08e8741 SHA-1: 1ae01353f41026db56484dec51859949db96c732 SHA-256: a75be7d0f06e60c678ae6f5fda0f2ac825c49564056951dec110bf6516fc6b5a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The document body includes a lure instructing the user to 'Enable editing' to view the content, a common social engineering tactic. The presence of the Equation Editor exploit suggests an attempt to execute arbitrary code upon activation of the embedded object.

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_off0000461e.bin
f7e0c183021af06dce6fd602bb03083eed8fe64ce6efedf734db776260ec448b
rtf-objdata-decoded RTF \objdata at offset 0x461E 1370 bytes