Malicious RTF — malware analysis report

Static analysis result for SHA-256 02b5cd1aef2e3035…

MALICIOUS

RTF

1.97 MB
MD5: f37278e238e7b0e0f828ef88224ca656 SHA-1: e3ea57d6c144a903805816a006b9653bb8c7f4c3 SHA-256: 02b5cd1aef2e3035c160ccd6bc6ccaa7164c250437d2a046a96219ae552ef71f
260 Risk Score

Malware Insights

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

The RTF file contains multiple critical heuristic firings indicating the exploitation of CVE-2017-11882 through an embedded Equation Editor OLE object. The object's native payload is decoded and appears to be a second-stage executable, likely intended for execution on the victim's machine. The presence of OLE objects and the specific CVE strongly suggest a malicious document designed to deliver an exploit.

Heuristics 6

  • 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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 ~2054KB 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_off000000da.bin
e8677dd4a75e2d324c8f4701deba477c9484f4359caf3fdda596ab7c240a59a8		 rtf-objdata-decoded RTF \objdata at offset 0xDA 1028938 bytes

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