Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 600bf146efa51b38…

MALICIOUS

RTF / .DOC

1.73 MB
MD5: 411bc60dedab2323705c49b657990d59 SHA-1: c23e28d2fb158e8fc2f3c6179702e2a980b29b54 SHA-256: 600bf146efa51b38dceb6271a44fc4cc9bc115d280ef01700305a34b39581b17
220 Risk Score

Malware Insights

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

The RTF document contains critical heuristic firings indicating the exploitation of CVE-2017-11882 via Microsoft Equation Editor. The presence of OLE object data and excessive hex data suggests that a payload is embedded and likely executed upon opening. The document's purpose is to exploit this vulnerability for initial execution.

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 ~1804KB 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_off00001c16.bin
c42f0987e9dac1bd3227ec71593e2abb8f5d14866fbe7620d0e5f4fd20db4c6b		 rtf-objdata-decoded RTF \objdata at offset 0x1C16 902427 bytes

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