Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 4c0c8f6cab02843a…

MALICIOUS

RTF / .DOC

2.20 MB
MD5: 3def0a6c0d0ac9cf78d5f51a2eff8745 SHA-1: ce13da7087b5d3a8df603e55e3e316e44649fc4b SHA-256: 4c0c8f6cab02843ab7c116b0e960e342814095fc9335d125b93eca35ade21785
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.001 Component Object Model T1027 Obfuscated Files or Information

The RTF file contains multiple indicators of malicious activity, including embedded OLE objects and excessive hex-encoded data, strongly suggesting it is designed to hide and deliver a payload. The presence of critical heuristics related to Equation Editor and CVE-2017-11882 indicates a likely exploit attempt targeting this vulnerability. No document body or scripts were extracted, but the heuristics alone are sufficient to infer the attack pattern.

Heuristics 5

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~2160KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000076.bin
cc1b4bb87e1925b2c016fdbd95da617bb7cf914d2b68a51be1b3d9586b74ea74		 rtf-objdata-decoded RTF \objdata at offset 0x76 1097117 bytes

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