Malicious RTF — malware analysis report

Static analysis result for SHA-256 fdefef868d633182…

MALICIOUS

RTF

13.3 KB First seen: 2020-01-07
MD5: 4e28297a5385cddf56a7420d0c42f167 SHA-1: 2b98cc924c96058287bb6d7cdb614dbc1830d496 SHA-256: fdefef868d633182f52aca201ecca549fd3496819b45e864970a617e770b6361
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, and uses \objupdate to force activation. This indicates exploitation of a known vulnerability in Equation Editor (CVE-2017-11882) for client execution. The presence of OLE object data and the Ole10Native stream suggests the embedded object is malicious and likely contains shellcode or a payload designed to download further malware.

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_off000014a4.bin rtf-objdata-decoded RTF \objdata at offset 0x14A4 4147 bytes
SHA-256: bc8a5e94f96038b23b10051568a479973b8358b9e3eb18631f11e5361f981549

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