Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0c0b9e079a1912cf…

MALICIOUS

RTF / .DOC

1.95 MB
MD5: f726726f4f0855ed2f18e4e183101c2d SHA-1: 69b7bf08b2b2c7fd3c8aca610f8a8032aaa0cfdb SHA-256: 0c0b9e079a1912cf866b2d52e0d6602467be9c1366f7e3b17490c3ed861cf623
240 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object specifically identified as related to CVE-2017-11882. This exploit is known to deliver a second-stage payload, likely a binary executable, which is indicated by the presence of a large, entropy-rich OLE1 native payload. The ".bin" file extracted from the objdata section is highly suspicious and likely contains the malicious executable.

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 ~2047KB 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
  • 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_off0000003d.bin
ffac8a38424db497ffb5b13633761a7407a7e3a743380efccd81d902043024c0		 rtf-objdata-decoded RTF \objdata at offset 0x3D 1023924 bytes

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