Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3f026078081376c7…

MALICIOUS

RTF / .DOC

68.6 KB First seen: 2023-03-02
MD5: 7bcf54c12d239d6f14b7158c9843f76a SHA-1: ae2a5abaa067f0f135703f0a44de8afbe1fa8051 SHA-256: 3f026078081376c7844de7a0db89f4c956829797495deb97f0fb8fd150c3bba7
100 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects, with a specific heuristic indicating that \objupdate forces OLE activation. The document body provides a lure, instructing the user to 'click Enable editing', a common tactic to bypass macro security. This suggests the embedded OLE object is intended to be executed, likely to download and run a secondary payload.

Heuristics 4

  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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_off00001c63.bin
d71088fd68b55b10900d744b32573261f73024fb9d2ec82d581665039d862885
rtf-objdata-decoded RTF \objdata at offset 0x1C63 4170 bytes