Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 1fadcb1ce6bac96f…

MALICIOUS

RTF / .DOC

61.5 KB First seen: 2023-03-02
MD5: c60290db34ce19ea8773a0a6bcdf088d SHA-1: 84cadce113f36dd4a501d2397871a5783608b009 SHA-256: 1fadcb1ce6bac96f400f0257ef19038bf006b3cb260d023ff635bc518c5bece2
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The RTF document contains embedded OLE objects and uses an ".objupdate" directive, indicating an attempt to activate embedded content. The document body presents a lure related to financial audits, instructing the user to 'Enable editing', a common tactic to bypass macro security. This suggests the file is designed to exploit user interaction to download and execute 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_off00001ff3.bin
eb4ae8f318a6b7914cc0338d77744b4a856550a5585f1d1f6db204b83bda71c9
rtf-objdata-decoded RTF \objdata at offset 0x1FF3 3657 bytes