Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e96b78b304d36170…

MALICIOUS

RTF / .DOC

82.3 KB First seen: 2023-09-20
MD5: de8dccb1065c19531df50171d73ed6be SHA-1: 460332fa5c184a49e4d2a6012608a5b08004b4a8 SHA-256: e96b78b304d36170a18e1aaf50547133ddf8ab10925da128946136ce87e02cfc
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 Malicious File T1566 Phishing T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Visual Basic

The sample is an RTF document containing an embedded OLE object, specifically identified as an Equation Editor exploit. The document body presents a lure related to financial audits to encourage users to enable editing, which would trigger the OLE object's execution. This indicates a likely attempt to exploit a vulnerability via user interaction to deliver a malicious payload.

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_off00003786.bin
7f90935563a967dccbca6758069d681f21042009ddc1237bc15c69468cce239d
rtf-objdata-decoded RTF \objdata at offset 0x3786 1893 bytes