Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e1483f07e9c16a59…

MALICIOUS

RTF / .DOC

1.72 MB
MD5: 9e4e20013aee0ff506e93a8db1adf5c3 SHA-1: 720766a160e12554eb4bc35203dc7188fab0a91a SHA-256: e1483f07e9c16a59ecdd556ea9c448eab189d77107a08c19a3f93476f0942745
220 Risk Score

Malware Insights

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

The sample is an RTF document containing OLE object data, specifically exploiting CVE-2017-11882 via the Equation Editor. The presence of OLE object data and the critical heuristic firings strongly indicate the exploitation of this known vulnerability. The embedded OLE object is likely a second-stage payload, although its exact nature cannot be determined from the provided static analysis alone. The RTF structure and the specific exploit targeted suggest a phishing or drive-by download attack vector.

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 ~1799KB 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_off0000153d.bin
1298e79e19ef96c19d8873662b5bf4e2946c8b66f73c0c581b32113a283c727a		 rtf-objdata-decoded RTF \objdata at offset 0x153D 899690 bytes

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