Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 972df6e24cf56a85…

MALICIOUS

RTF / .DOC

1.58 MB
MD5: da3c4ff3eadd681063012d9d1bf50ea0 SHA-1: d7939f24f979fee1c7ecb2c8d79b32cafe7d8a7d SHA-256: 972df6e24cf56a850f3aa05daf13476939217f9a202691235c0ea0e2f72b390c
260 Risk Score

Malware Insights

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

The RTF document contains OLE object data and is specifically flagged as related to CVE-2017-11882, indicating exploitation of this vulnerability. The presence of large hex data blocks within the OLE object suggests a hidden payload. The automatic linking and update of the OLE object further support the exploitation attempt. The primary attack vector is likely a malicious attachment delivered via spearphishing, leading to the execution of a secondary payload.

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 ~1652KB 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_off00001ce2.bin
877c5f5e7703cdd1f5cd2922f8165e5d3badbf9ccdba9a9d5b50f59bc0cc8d4f		 rtf-objdata-decoded RTF \objdata at offset 0x1CE2 826525 bytes

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