Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 40a1e3bd844ee9dc…

MALICIOUS

RTF / .DOC

594.0 KB
MD5: 8e17a52fde17d9a04b1e7915ebb0d5aa SHA-1: 40dea7385b9fed66afa42fef47713329d8597be5 SHA-256: 40a1e3bd844ee9dcfc2685c25b6fd6637bf4166c2d5070fe91058548d4e2e671
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 Malicious File T1566 Phishing T1566.001 Spearphishing Attachment

The sample is an RTF document that contains embedded OLE objects, with a specific heuristic indicating that \objupdate forces OLE activation. The document body contains a lure instructing the user to 'Enable editing' and mentions financial statements and auditors, suggesting a pretext to trick the user into activating the embedded malicious content. This content likely downloads and executes a second-stage 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_off0000fd77.bin
027d588c5d92ad586b90014c296e8c5d0e5847196e9bce8f7a859c73b60267ab
rtf-objdata-decoded RTF \objdata at offset 0xFD77 4290 bytes