Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 fbfb4bcb97baad25…

MALICIOUS

RTF / .DOC

1.68 MB
MD5: d30983128ec5601b2a1622d31ca0d0a6 SHA-1: 751d1421d3ce4bee92c2dac61fe810958ce718ee SHA-256: fbfb4bcb97baad25166a48e34aa31c4dc7740dded1eab9a95d37d6510f8328f0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Phishing: Spearphishing Attachment

The RTF document contains an embedded OLE object specifically related to CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. The presence of ".objdata" and ".objupdate" directives, along with excessive hex-encoded data, indicates the object is intended to be activated, likely leading to the execution of a second-stage payload. No document body text or scripts were provided, so the exact nature of the payload cannot be determined.

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 ~1761KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003e.bin
7ff35429228d32e5b06953b979cc0749db3bc789d6244c4f72ab058327339675		 rtf-objdata-decoded RTF \objdata at offset 0x3E 880787 bytes

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