Malicious RTF — malware analysis report

Static analysis result for SHA-256 ea99b5c919172213…

MALICIOUS

RTF

14.0 KB First seen: 2019-11-20
MD5: dab76dc51cffe795a2703d9ce5a18ec0 SHA-1: 79f3b46e60745e6e1dba81d3fda6be56f4205396 SHA-256: ea99b5c919172213faf6f421f85299369d552b1beac5dc56648663526166e0f1
160 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object with an Equation Editor CLSID, indicating exploitation of a known vulnerability (CVE-2017-11882). The presence of \objupdate and Ole10Native stream further suggests that the embedded object is designed to be activated, likely to download and execute a secondary payload. No document body or script content was available for further analysis.

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
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000162f.bin rtf-objdata-decoded RTF \objdata at offset 0x162F 4154 bytes
SHA-256: d952a4c967847eb5a85644c29c86c55570a1566d98a234640a6cfc08f4d57e5d

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