Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e3cb3cff18801656…

MALICIOUS

RTF / .DOC

1.84 MB
MD5: 384ebc78e72f2353ee283556d96740ce SHA-1: 76e9c0e0ea55d4474f7f63d7f1370643ab9b07b1 SHA-256: e3cb3cff1880165667bde2c426821b3fc6090bbd681cddf40f458fc459d6ba77
240 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model and Distributed Component Object Model

The RTF document contains an embedded OLE object specifically identified as related to CVE-2017-11882, exploiting the Equation Editor vulnerability. The presence of large hex-encoded data within the OLE object suggests it is hiding a payload. The object is configured to auto-activate via \objupdate, leading to client-side execution.

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.
  • \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 ~1917KB 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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002016.bin
d1b2d94cd028e30384c0d3b0a4137c0220f5a91dc652f64fa13642d9074009f5		 rtf-objdata-decoded RTF \objdata at offset 0x2016 959009 bytes

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