Malicious RTF — malware analysis report

Static analysis result for SHA-256 da74941a53c6db4e…

MALICIOUS

RTF

8.2 KB First seen: 2019-11-20
MD5: 86c43e50c367fd3edc08244f87c9750e SHA-1: 5e74838af54dc903766495ddb2af0a802e50a0a5 SHA-256: da74941a53c6db4ef74ffcba67031e3933820ea83520b54d80b255ede49b22c7
120 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and triggers an exploit related to Microsoft Equation Editor. The ".objupdate" directive indicates that the embedded object is intended to be activated, which is a common method for exploiting vulnerabilities like CVE-2017-11882. This exploit allows for arbitrary code execution, likely to download and run a secondary payload, making it a classic spearphishing attachment.

Heuristics 3

  • 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
  • \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_off00000033.bin rtf-objdata-decoded RTF \objdata at offset 0x33 4157 bytes
SHA-256: 59fe20fcc41d8076f4e0b6699bf2f4d2f332846f5fd69bb5928f781a2eb66f7e

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