Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 42850134b2e44b13…

MALICIOUS

RTF / .DOC

73.5 KB First seen: 2023-03-01
MD5: e97c70eb2ef9fec22aea9b56fc751271 SHA-1: 4fcbcbdd4eb30adf26743c7e45898ef356aeb369 SHA-256: 42850134b2e44b1350184fe06903d7eeea21927b9b6e943f9ceba771e2fc2198
80 Risk Score

Malware Insights

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

The sample is an RTF document that contains OLE object data and an ".objupdate" directive, indicating it's designed to trigger embedded content. The heuristic SE_ENABLE_LURE confirms the document body contains text instructing the user to enable editing, a typical social engineering lure for macro-enabled malware. The presence of OLE objects and the lure strongly suggest this document is a dropper intended to execute a malicious payload upon user interaction.

Heuristics 3

  • \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_off00002dd4.bin
06e2396590552cd71fd7bcb137b9f9ec631cae29236df61ef96ca360ffd6420d
rtf-objdata-decoded RTF \objdata at offset 0x2DD4 4164 bytes