Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 70b7879f9b98ece1…

MALICIOUS

RTF / .DOC

14.3 KB First seen: 2023-05-08
MD5: bd4debd26af6536e5ebaff3a97065cae SHA-1: 7066006de482950432aa7404d8a3414bd893dfe9 SHA-256: 70b7879f9b98ece1dea628f1389a1400c8444f1b98bcdfba57c3fa6ebce75dab
240 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an RTF document containing an OLE object with embedded data, triggering heuristics related to OLE object activation and the Equation Editor. ClamAV specifically identifies it as Rtf.Exploit.CVE_2017_11882-6584355-1, indicating exploitation of the Equation Editor vulnerability (CVE-2017-11882). The document body contains a lure instructing the user to enable editing, which is a common tactic for macro-based malware delivery.

Heuristics 6

  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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_off00001c3d.bin
dd84b543805be53f67c5d72d4f13ed8be4a1f422f45052a3d9c76ff56b09e30a
rtf-objdata-decoded RTF \objdata at offset 0x1C3D 3654 bytes