Malicious RTF — malware analysis report

Static analysis result for SHA-256 11b11dc24ac1a6ce…

MALICIOUS

RTF

9.1 KB First seen: 2018-03-30
MD5: 6e35d09b67e9e856476d865e41a1bbf0 SHA-1: 4a92aa8ec3d0e0e797dbce5996a239d7cdf5cd60 SHA-256: 11b11dc24ac1a6ce0a4de93780b6ca52198b00358148eaa0bd7257a2e52f2b03
320 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This exploit allows for arbitrary code execution when the object is activated, likely leading to the download and execution of a secondary payload. The ClamAV detection further confirms the malicious nature of this exploit.

Heuristics 7

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003e.bin rtf-objdata-decoded RTF \objdata at offset 0x3E 4649 bytes
SHA-256: a4baa52d2ae94a3b81995b2acc8e144d8a0a5999af1aa6aaef3e4a727aedcba8

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