Malicious RTF — malware analysis report

Static analysis result for SHA-256 37fd813367cd3ccd…

MALICIOUS

RTF

14.3 KB First seen: 2019-05-16
MD5: f7467d39500dd30e142a5d10e1f53174 SHA-1: 80ce37c172dc63dd5633867e6cfb6a5b3a9ced52 SHA-256: 37fd813367cd3ccdfe57271e203ec3035430a0e6645ae4cdfd8b13bfdd1434c5
320 Risk Score

Malware Insights

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

The file is an RTF document that contains an embedded OLE object exploiting the Equation Editor vulnerability (CVE-2017-11882). This exploit is known to download and execute a second-stage payload, indicating a malicious intent to compromise the user's system. The ClamAV detection further confirms the malicious nature of the file.

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
  • 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_off000014c0.bin rtf-objdata-decoded RTF \objdata at offset 0x14C0 4666 bytes
SHA-256: ff455eb5299837cb596684b95059cf9e039997ae12c03eeb002dd8df03430561

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