Malicious RTF — malware analysis report

Static analysis result for SHA-256 02ef288a7ec44cc4…

MALICIOUS

RTF

14.3 KB First seen: 2018-09-04
MD5: 4402267eb97c2610401aaa026cf0104c SHA-1: 45f86ffa8084f05a1cdf12727908e3d838bb0d77 SHA-256: 02ef288a7ec44cc45b7e7971e77aefcf640dc6cadc334145870dcca8fd4f743d
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 that leverages the Equation Editor vulnerability (CVE-2017-11882). This exploit is designed to execute arbitrary code, which is typically used to download and run a second-stage malicious payload. The presence of the Equation Editor CLSID and Ole10Native stream strongly indicates this attack vector.

Heuristics 6

  • 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.
  • \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
  • 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_off00000800.bin rtf-objdata-decoded RTF \objdata at offset 0x800 4157 bytes
SHA-256: 16d24f796c54d4f9141b3c7f6f7072669d7e2878308170a8ee2f406b5428a5a1

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