Malicious RTF — malware analysis report

Static analysis result for SHA-256 5d29e52b7a8ba8af…

MALICIOUS

RTF

11.6 KB First seen: 2020-02-04
MD5: 8ce056794be7cb1d3c20136f58507d52 SHA-1: a288d5f0880fa5630df60b0e3d6a90aeb6404f46 SHA-256: 5d29e52b7a8ba8afdb5be06da73b80310280ae2f5fc864d8d9e37d2cf4f0c747
300 Risk Score

Malware Insights

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

The RTF document contains embedded OLE object data and specifically triggers the Equation Editor CLSID, indicating exploitation of CVE-2017-11882. This vulnerability allows for arbitrary code execution, which is likely used to download and execute a further stage payload. The ClamAV detection name further confirms the exploit.

Heuristics 7

  • 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
  • Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
  • 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.
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000a2a.bin rtf-objdata-decoded RTF \objdata at offset 0xA2A 4643 bytes
SHA-256: 2f930dcd7886547258141b53b8202a48e4eb3522edeebf17ba6173d82deb3d2e

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