Malicious RTF — malware analysis report

Static analysis result for SHA-256 3690439636330947…

MALICIOUS

RTF

66.5 KB First seen: 2019-05-16
MD5: 40093d40d36aeaa8b906a425d7dd724e SHA-1: 980e6aa3526c4e2c51d3f09418ab53e3dde1241a SHA-256: 36904396363309478de5785055d187bcf93d8864562754c0ff77b869a3860f33
160 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 specifically triggers the Equation Editor CLSID, indicating exploitation of a vulnerability within it. The ".objupdate" directive forces the activation of this embedded object, leading to arbitrary code execution. This is a common technique for delivering malicious payloads via spearphishing attachments.

Heuristics 4

  • 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
  • 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_off0000e350.bin rtf-objdata-decoded RTF \objdata at offset 0xE350 4667 bytes
SHA-256: 98fc45772646790df52d10ad0984297d85e4407bb07e21ebd3f258042b2e394d

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