Malicious RTF — malware analysis report

Static analysis result for SHA-256 344fbc5e86e6477c…

MALICIOUS

RTF

722.1 KB Created: 2018-08-23 08:28:00 Authoring application: Microsoft Word 11. 0.5604 First seen: 2020-12-25
MD5: c594d38ed3b243bd549457f213527b34 SHA-1: 8b78ce289f4c166cfeeb0f606fe27ce7f39045f9 SHA-256: 344fbc5e86e6477cdb24848ace149303e22b41f7b01b2eca923109868c1f458f
282 Risk Score

Heuristics 8

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • ClamAV: Rtf.Dropper.Agent-7084678-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7084678-0
  • \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.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000cd13.bin rtf-objdata-decoded RTF \objdata at offset 0xCD13 333552 bytes
SHA-256: 3d4a79ab0b7f8cee9fc0e425b64155e3e2ba6bc63e762b50e3b2bfa6a84b118d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
objdata_01_off000afb29.bin rtf-objdata-decoded RTF \objdata at offset 0xAFB29 9796 bytes
SHA-256: 569590d9e7132afd29d3f66f48b37b57334d953b935c1b4e82f8ebd000906072
objdata_02_off000afb3b.bin rtf-objdata-decoded RTF \objdata at offset 0xAFB3B 35 bytes
SHA-256: 1188b98b21f50564ab8b476f25b6deab999a2f58a56c4dd0daa0f5883cfa941d

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