Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 5e6d294a19eabb80…

MALICIOUS

RTF / .DOC

34.8 KB First seen: 2023-01-10
MD5: 93389add57780688e0dc83eb8e3e6199 SHA-1: 0a28912f74c4b845ccc5dbeb2f2564f4b4f4f8a4 SHA-256: 5e6d294a19eabb80d38af626113477b91a0d41a95e7843d6562627f63adfd537
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an RTF document containing 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 tactic for macro-based malware. The presence of ".objdata" and ".objupdate" further suggests an attempt to exploit OLE object handling, likely leading to arbitrary code execution.

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_off00004f35.bin
aefdc2521186c3755d0bf4ebd2383390b4d20faaa53549dee5e4a03ffd34b35f
rtf-objdata-decoded RTF \objdata at offset 0x4F35 1683 bytes