Malicious RTF — malware analysis report

Static analysis result for SHA-256 849633f5a2386ec8…

MALICIOUS

RTF

8.3 KB First seen: 2020-02-04
MD5: c549f52e411a4cb064e668f2fcc9dee7 SHA-1: 86aafd2b2ffd3accd1b0e243460d7795bf44a9d2 SHA-256: 849633f5a2386ec8a970f6abae03a96e55a78e7b2b1afe6940919a5acac61a11
120 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive forces the activation of this object, leading to arbitrary code execution. This is a common technique for delivering secondary payloads, often initiated via spearphishing attachments.

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 4130 bytes
SHA-256: 9742a86cfde647843f3aa01b423c768ae743107c8bccb223027c8541fb56afbe

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